Gain_trimmable_wideband_FET_amplifier

Published:2009/7/23 23:45:00 Author:Jessie | From:SeekIC

This circuit is similar to that of Fig. 1-19, except that voltage gain can be trimmed (to full unity gain, or to a gain of 10, etc.). With a 1-kΩ gain adjust set to unity, power bandwidth (1 Vpp) is 10 MHz, and slew rate is 100 V/μs. With the voltage gain set at 10, power bandwidth stays at 10 MHz, while the -3-dB point drops to about 22 MHz (from about 35 MHz at unity gain). With the optional discrete stage, slew rate exceeds 1000 V/μs, full power bandwidth is 18 MHz, and the -3-dB point is 58 MHz. With a voltage gain of 10, full power is available to 10 MHz, with the -3-dB point at 36 MHz. Figures 1-20B and 1-20C show the response with the LT1010 output, and the discrete output, respectively. As shown, the discrete stage is slightly faster (less delay between input and output).



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