Explain vertical deflection subsystem with neat diagram.

Explain vertical deflection subsystem with neat diagram.
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Answer :

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vertical deflection subsystem

The main function of the vertical deflection system is to provide an amplified signal of prope r level toderive the vertical deflection plates without any distortion. For amplification of the signal to appropriate level, it uses the vertical amplifier. Figure shows the block diagram of th e vertical amplifier.

The vertical amplifier consists of a number of stages having fixed overall sensitivity or gain w hich is expressed in volts / division. Because of fixed gain the amplifier can designed in a man ner such that it meets the requirements of stability and bandwidth.

The input stage of the preamplifier consists of an FET source follower. The FET source follow er has high input impedance. This impedance is isolated the FET amplifier from the attenuat or. The FET source follower input stage is followed by a BJT emitter follower .this is done in Order to match the medium impedance of the FET amplifier with low input impedance of th e phase inverter.

Two antiphase output signals are provided by the FET amplifier, in order to derive the push‐ pull amplifier output. The push pull out put stage delivers equal signal voltage of opposite po larities to the vertical deflecting plates of the CRT. The advantages of using push‐ pull stage at the output are better hum cancellation, even harmonic suppression, reduced no nlinear effects because none of the plates are at ground potential. 

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