Posted on Jun 27, 2012

This amplifier functions over a wide range of gains, typically 1-10. It combines the LT1010 and a fast discrete stage with an LT1008 based de stabilizing loop. Q1 and Q2 form a differential stage which single-ends into the LT1010. The circuit delivers 1 V pk-pk into a typical 75-0 video load. At A = 2, the gain js within 0.5 dB to 10 MHz with the - 3-dB point occurring at 16 MHz.

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At A = 10, the gain is flat (±0.5 dB to 4 MHz) with a -3-dB poinLat 8 MHz. The pealring adjustment should be optimized under loaded output conditions. This is a simple stage for fast applications where relatively low output swing is required. Its 1 V pk-pk output works nicely for video circuits. A possible problem is the relatively high bias current, typically 10uA. Additional swing is possible, but more circuitry is needed.

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