Stabilized_ultra_wideband_current_mode_feedback_amplifier

Published:2009/7/23 20:32:00 Author:Jessie | From:SeekIC

virtually any video or wideband application. For gains from 1 to 20, full-power bandwidth is 25 MHz, with the -3-dB point beyond 110 MHz. Gain is sot for 10 (with the values shown) by the 51- and 470-Ω Q3/Q4 emitter resistors. Slew rate exceeds 3000 V/μs.Damping is optimized with the 10-pF trimmer at the Q5/Q6 collectors. To use the circuit, adjust the IQ level to 80 mA immediately after turn on. Next, sot the A2 input resistor divider to a ratio appropriate to the closed-loop gain (1 and 9 kΩ, in this case). Finally, adjust the 10-pF trimmer for best results (preferably with a square-wave input). Notice that this circuit has no output protection.



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