VIDEO_LINE_DRIVING_AMPLIFIER

Published:2009/7/9 1:22:00 Author:May | From:SeekIC

Q1 and Q2 form a differential stage which single-ends into the LT1010. The capacitively terminated feedback divider gives the circuit a dc gain of 1, while allowing ac gains up to 10. Using a 20-Ω bias resistor, the circuit delivers 1 V pk-pk into a typical 75-Ω video load. For applications sensitive to NTSC requirements, dropping the bias resistor value will aid performance. At A = 2, the gain is within 0.5 dB to 10 MHz and the -3 dB point occurs at 16 MHz. At A = 10, the gain is flat, with ±0.5 dB to 4 MHz .and the -3 db point occurs at 8 MHz。The peaking adjustment should be optimized under loaded output conditions．



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