Draw the frequency response of DC amplifier. Comment on it.

Draw the frequency response of DC amplifier. Comment on it.
by

1 Answer

Answer :

frequency response:

image

Comment : The gain remains constant at its midband value AM down to zero frequency (DC). Directcoupled amplifiers do not suffer gain reduction at low frequencies as compared to the capacitively coupled amplifiers that use bypass capacitors. However, gain falls off at the high frequency end due to the internal capacitances of the transistor.

by

Related questions

Draw the circuit of single tuned amplifier and state its operating principle.

Description : Draw the circuit of single tuned amplifier and state its operating principle.

Last Answer : Operating Principle: The working of tuned voltage amplifier may be understood by considering a radio frequency signal, to be amplified applied at the input of the amplifier. The resonant frequency ... will be amplified. And all the other frequencies will be rejected by the tuned circuit. 

Draw the single stage class A power amplifier circuit diagram and draw the input and output waveforms.

Description : Draw the single stage class A power amplifier circuit diagram and draw the input and output waveforms.

Last Answer : Circuit diagram:- Input / Output waveforms:-

Draw the circuit diagram of complementary symmetry Class B push-pull amplifier and describe its working.

Description : Draw the circuit diagram of complementary symmetry Class B push-pull amplifier and describe its working.

Last Answer : Diagram of complementary symmetry Class B push-pull amplifier: Working: The above circuit employs a NPN transistor and a PNP transistor connected in push pull configuration. When the input ... of class B, this circuit is termed as Complementary symmetry push pull class B amplifier.

Draw the multistage amplifier circuit diagram using RC coupling. State its advantages.

Description : Draw the multistage amplifier circuit diagram using RC coupling. State its advantages.

Last Answer : Advantages: 1. It has a wide frequency response. 2. For coupling the resistor and the capacitor are used and which are not expensive so the cost is low. 3. The circuit is very ... a wide frequency band. 5. It is high fidelity amplifier. 6. It provides less frequency distortion.

State the need of multistage amplifier. Draw frequency response of R-C coupled amplifier.

Description : State the need of multistage amplifier. Draw frequency response of R-C coupled amplifier.

Last Answer : The need of multistage amplifier The voltage (or power) gain, obtained from a single stage small signal amplifier, is limited. Therefore, it is not sufficient for all practical applications. Therefore, in ... to use a MULTISTAGE AMPLIFIER .  Frequency response of R-C coupled amplifier.

Draw the labeled circuit of RC phase shift oscillator. State the formula for frequency of oscillator.

Description : Draw the labeled circuit of RC phase shift oscillator. State the formula for frequency of oscillator.

Last Answer : Frequency of oscillation is given by,

List the types of power amplifier.

Description : List the types of power amplifier.

Last Answer : Types of Power amplifier: 1) Class A power amplifier 2) Class B power amplifier 3) Class AB power amplifier 4) Class C power amplifier

Sketch the single tuned amplifier.

Description : Sketch the single tuned amplifier.

Last Answer : single tuned amplifier

State and explain the working principle of FET amplifier and list its applications.

Description : State and explain the working principle of FET amplifier and list its applications.

Last Answer : Operation of FET amplifier: When small a.c. signal is applied to the gate, it produces variation in the gate to source voltage. This results in variation in the drain current. As ... input voltage.  Application: Buffer amplifier Low noise amplifier Cascade amplifier Chopper amplifier

Compare between class A and class B amplifier on the basis of (i) Efficiency (ii) Power (iii) Position of Q- point (iv) O/P distortion

Description : Compare between class A and class B amplifier on the basis of (i) Efficiency (ii) Power (iii) Position of Q- point (iv) O/P distortion

Last Answer : Parameter Class A Class B 

List applications of power amplifier.

Description : List applications of power amplifier.

Last Answer : Below are the applications of power amplifiers across different sectors: 1.Consumer Electronics: Audio power amplifiers are used in almost all consumer electronic devices ranging from microwave ovens, ... data transfer rates and usability. They are also used in satellite communication equipment.

State the need and types of amplifier coupling.

Description : State the need and types of amplifier coupling. 

Last Answer : Need of amplifier coupling: 1.When ever large amplifier with very good impedance matching is required, a signal stage amplifier circuit will not able to amplify the signal to a large extent. 2 ... 2.Transformer coupled amplifier 3.Direct coupled amplifier 4. Inductance (LC) coupling

State the need of biasing and describe the concept of DC load line

Description : State the need of biasing and describe the concept of DC load line

Last Answer : Need of Biasing for Transistor: The transistor should be biased in the active region if it is to be used for amplification and in saturation and cut off if it is used as a switch. 2. The Q ... The position of operating point on the load line is dependent on the application of the transistor.

Draw the characteristics of UJT and state its working principle.

Description : Draw the characteristics of UJT and state its working principle.

Last Answer : The characteristics of Unijunction Transistor (UJT) can be explained by three parameters: * Cutoff Region * Negative Resistance Region * Saturation Region Cutoff Region : The ... in its ON position. The emitter voltage VE remains almost constant with the increasing emitter current.

State the basic principle of piezoelectric crystal and draw the circuit diagram of crystal oscillator.

Description : State the basic principle of piezoelectric crystal and draw the circuit diagram of crystal oscillator.

Last Answer : Basic Principle: The main principle of a piezoelectric crystal is that a mechanical force, when applied on the crystal, it vibrates and produces electric charges on the crystal surface. When ac voltage is applied across crystal, it vibrates at the frequency of the applied voltage. (OR)

Draw the input and output characteristics of CE configuration.

Description : Draw the input and output characteristics of CE configuration.

Last Answer : Input characteristics of CE configuration: Output characteristics of CE configuration:

Draw the circuit diagram of Bootstrap’s time base generator and explain its working.

Description : Draw the circuit diagram of Bootstrap’s time base generator and explain its working.

Last Answer : Circuit Diagram Waveform: Here transistor Q1 acts as a switch and transistor Q2 acts as an emitter follower (i.e. a unit gain amplifier).  Circuit Operation: Initially transistor ... The circuit pulls itself up by its own bootstrap and hence it is known as bootstrap sweep circuit. 

Draw the construction of p-channel D-MOSFET and state its working principle.

Description : Draw the construction of p-channel D-MOSFET and state its working principle. 

Last Answer : Construction of p-channel D-MOSFET: Working principle: The gate to source voltage is set to zero volts by the direct connection from one terminal to the other & voltage VDS is applied ... The value of voltage of VGS at which drain current nearly becomes zero is called cut off voltage. 

Draw the drain characteristics of p-channel FET and explain.

Description : Draw the drain characteristics of p-channel FET and explain.

Last Answer : Drain characteristics:- As VDS is increased from zero as shown , ID will increased proportionally through the p channel. In this region the channel resistance is constants because the depletion region is ... the depletion layer. (i.e. channel width zero) is called cutoff voltage or VGS(off).

Draw the circuit and explain the operation of UJT relaxation oscillator.

Description : Draw the circuit and explain the operation of UJT relaxation oscillator. 

Last Answer : Working: When the supply voltage (VCC) is switched ON, the capacitor charges through resistor (R), till the capacitor voltage reaches the voltage level (VP) which is called as peak point voltage. At ... resistor R is shown as a variable resistor. The sweep period is given by the relation

Draw the transfer characteristics for N-channel JFET.

Description : Draw the transfer characteristics for N-channel JFET.

Last Answer : Transfer characteristics for N-channel JFET: 

Draw symbol for n-channel and p-channel MOSFET.

Description : Draw symbol for n-channel and p-channel MOSFET.

Last Answer : Symbol n-channel and p-channel MOSFET :   OR  

In the illustrated circuit, one advantage of the capacitor coupling over direct coupling is ____________. EL-0048 A. as the frequency decreased the capacitive reactance (Xc) increases B. the amplifier becomes more efficient at lower capacitance. C. the arrangement allows the coupling of the signal while it isolates the biasing of each stage. D. good frequency response.

Description : In the illustrated circuit, one advantage of the capacitor coupling over direct coupling is ____________. EL-0048 A. as the frequency decreased the capacitive reactance (Xc) increases B. the amplifier becomes ... of the signal while it isolates the biasing of each stage. D. good frequency response.

Last Answer : Answer: C

What component in an amplifier circuit tends to limit the low-frequency response of the amplifier?

Description : What component in an amplifier circuit tends to limit the low-frequency response of the amplifier?

Last Answer : The coupling capacitor (C3).

What components can be used to increase the high frequency response of an amplifier?

Description : What compone What components What components can be used to increase the high frequency response of an amplifier?

Last Answer : Peaking coils.

What is the major factor that limits the high-frequency response of an amplifier circuits?

Description : What is the major factor that limits the high-frequency response of an amplifier circuits?

Last Answer : The capacitance of the circuit.

What are the factors that limit the frequency response of a transistor amplifier?

Description : What are the factors that limit the frequency response of a transistor amplifier?

Last Answer : The capacitance and inductance of the circuit and the interelectrode capacitance of the transistor.

One of the following is a possible cause of an abrupt frequency variation in a self exited transmitter oscillator circuits resulting to a poor frequency stability to hold a constant frequency oscillation. A. Heating and expansion of oscillator coil B. DC and RF ac heating of resistors which cause change in values C. Heating of capacitor in the oscillatorD. Loose connections in the oscillator, amplifier, or antenna circuits.

Description : One of the following is a possible cause of an abrupt frequency variation in a self exited transmitter oscillator circuits resulting to a poor frequency stability to hold a constant frequency ... capacitor in the oscillator D. Loose connections in the oscillator, amplifier, or antenna circuits.

Last Answer : D. Loose connections in the oscillator, amplifier, or antenna circuits.

Which of the following is one of the possible causes for a slow drift of frequency in a self exited transmitter oscillator circuits resulting to a poor frequency stability? A. Poor soldered connections B. Power supply voltage changes C. Loose connections in the oscillator, amplifier, or antenna circuits D. DC and RF heating of resistors, causing then to change values.

Description : Which of the following is one of the possible causes for a slow drift of frequency in a self exited transmitter oscillator circuits resulting to a poor frequency stability? A. Poor soldered connections ... , or antenna circuits D. DC and RF heating of resistors, causing then to change values.

Last Answer : D. DC and RF heating of resistors, causing then to change values.

What would be a good response for people who may comment that you're "over qualified" for the job?

Description : What would be a good response for people who may comment that you're "over qualified" for the job?

Last Answer : answer: Then I guess I'll do a great job! They're probably mostly concerned that you won't be as interested in the work as they want you to be, or that the pay won't be as high ... express that you understand what the job is and that you're still interested, it will hopefully quell that concern.

Could someone possibly help me or tell me if it is even possible to find a response to a comment of mine on a specific subject in the body of a thread?

Description : Could someone possibly help me or tell me if it is even possible to find a response to a comment of mine on a specific subject in the body of a thread?

Last Answer : I’m not having any luck finding the response in question. Do you remember which jelly posted the answer? If so, you can put ”@username” into the search bar along with any keywords in the response you can remember. For example, ”@lillycoyote Victrola” gets you this result.

Using wordpress, does a response to a comment automatically send an email to the commenter?

Description : Using wordpress, does a response to a comment automatically send an email to the commenter?

Last Answer : No, but you can get plugins to do this for you. Hold on a moment and I’ll dig one up.

How can I reduce the bass response on my car amplifier?

Description : How can I reduce the bass response on my car amplifier?

Last Answer : Try adding a adding a capacitor.

In the illustrated amplifier, the RESET potentiometer A1R2 sets the stability of the control loop by changing the reset time constant. As the potentiometer is turned clockwise _________. EL-0060 A. the gain is increased B. the stability is increased by slowing the response time C. feedback is increased to the summing point at terminal 5 D. response time is increased decreasing stability

Description : In the illustrated amplifier, the RESET potentiometer A1R2 sets the stability of the control loop by changing the reset time constant. As the potentiometer is turned clockwise _________. EL-0060 A. ... is increased to the summing point at terminal 5 D. response time is increased decreasing stability

Last Answer : Answer: B

The device which converts AC to DC is (1) Oscillator (2) Amplifier (3) Rectifier (4) None of these

Description : The device which converts AC to DC is (1) Oscillator (2) Amplifier (3) Rectifier (4) None of these

Last Answer : (3) Rectifier Explanation: A rectifier is an electrical device that converts alternating current (AC). which periodically reverses direction, to direct current (DC), which flows in only one ... serving as components of DC power supplies and high-voltage direct current power transmission systems.

In the illustration, the component VR2 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to terminal 1 that controls the input to terminal 10 C. a zener diode that regulates the voltage to terminal 2 at 9.1 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Description : In the illustration, the component VR2 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to terminal ... 2 at 9.1 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Last Answer : Answer: C

In the illustration, the component VR1 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to terminal 9 that controls the input to terminal 10 C. a zener diode that regulates the voltage to terminal 9 at 6.6 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Description : In the illustration, the component VR1 on the A1 AMPLIFIER MODULE is _________. EL-0060 A. a zener diode to regulate the +9 volt power supply from common B. a variable resistor diode to control the output to ... terminal 9 at 6.6 volts DC D. a tunnel diode with a breakdown voltage of 6.6 Volts DC

Last Answer : Answer: A

An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a ____________. A. magnetic amplifier B. ship's service alternator C. three-wire DC generator D. saturable core reactor

Description : An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a ____________. A. magnetic amplifier B. ship's service alternator C. three-wire DC generator D. saturable core reactor

Last Answer : Answer: B

How can a DC equivalent circuit of an amplifier be obtained?

Description : How can a DC equivalent circuit of an amplifier be obtained?

Last Answer : By open circuiting the capacitor.

In a resistance loaded, RC coupled amplifier the dc component is blocked by A) Load resistance RL B) Coupling capacitor, CC C) RB D) The transistor.

Description : In a resistance loaded, RC coupled amplifier the dc component is blocked by A) Load resistance RL B) Coupling capacitor, CC C) RB D) The transistor.

Last Answer : B) Coupling capacitor, CC

If the operating point of an NPN transistor amplifier is selected in saturation region, it is likely to result in A) Thermal runaway of transistor B) Clipping of output in the positive half of the input signal C) Need for high dc collector supply D) Clipping of output in the negative half of the input signal

Description : If the operating point of an NPN transistor amplifier is selected in saturation region, it is likely to result in A) Thermal runaway of transistor B) Clipping of output in the positive half of the ... for high dc collector supply D) Clipping of output in the negative half of the input signal

Last Answer : B) Clipping of output in the positive half of the input signal

Which of the following is not true: A) An oscillator is a circuit that converts DC to AC B) An oscillator is an amplifier that supplies its own input signal C) All oscillators generate sine waves D) In phase feedback is called positive Feedback

Description : Which of the following is not true: A) An oscillator is a circuit that converts DC to AC B) An oscillator is an amplifier that supplies its own input signal C) All oscillators generate sine waves D) In phase feedback is called positive Feedback

Last Answer : C) All oscillators generate sine waves

The device which converts AC to DC is (1) Oscillator (2) Amplifier (3) Rectifier (4) None of these

Description : The device which converts AC to DC is (1) Oscillator (2) Amplifier (3) Rectifier (4) None of these

Last Answer : Rectifier

Explain the operating principle of PNP transistor.

Description : Explain the operating principle of PNP transistor. 

Last Answer : The circuit connection of PNP transistor with supply voltages is as shown above. The emitter-base junction is connected as forward bias. Due to this the emitter pushes the holes from the P ... by the collector. This develops the collector current IC. This is how a PNP transistor operates. 

Define intrinsic standoff ratio.

Description : Define intrinsic standoff ratio.

Last Answer : It is defined as the ratio of the RB1 (base resistance 1) to the inter-base resistance RBB. 

State 2 advantages of JFET over BJT.

Description : State 2 advantages of JFET over BJT.

Last Answer : Advantages of JFET over BJT: 1) High input impedance 2) Better thermal stability 3) Produce less noise 4) Smaller than BJT 5) Rugged in construction and simpler to fabricate 6) High degree of isolation between Input and Output. 

Which type of MOSFET is called Normally ON MOSFET”? Why?

Description : Which type of MOSFET is called Normally ON MOSFET”? Why? 

Last Answer : DMOSFET is called Normally ON MOSFET. In DMOSFET already channel is present and at Vgs = 0v, drain current Id=Idss i.e. drain to source saturation current is flowing. 

Define gain and bandwidth.

Description : Define gain and bandwidth. 

Last Answer : Gain: It is the ratio of output quantity to the input quantity. Bandwidth: It is defined as the range (band) of frequency over which the gain is constant.  (Or) It is the range of frequency over which the gain is greater than 70.7% of the maximum gain possible

State any four applications of transistor.

Description : State any four applications of transistor.

Last Answer : Amplifier

Define the following terms: (i) Stabilization (ii) Thermal runaway

Description : Define the following terms: (i) Stabilization (ii) Thermal runaway

Last Answer : Stabilization: The process of making operating point independent of temperature changes or variation in transistor parameter is known as stabilization. The maintenance of the operating point stable is called the ... happens, the device gets burnt out. This process is known as Thermal Runaway .