Circuit Description

The following function units are integrated in this circuit combination for video-IF processing:

Three symmetric, highly stable, gain controlled wide-band amplifier, quasi galvanic coupling eliminates feed back

Video carrier controlled demodulator of high linearity

Polarity switch over for video

Video output amplifier with low-pass characteristics, limiter for ultra black and inverter for ultra white interference

High impedance, interference free controlled voltage facilities, best possible AGC time constant with small storage capacitor

Controlled discharge circuit for fast gain control
With VTR - operation the video output level is according to the ultra white level in B/G, ultra black level in L