This Wideband 75MHz 28dB Gain Amplifier circuit is based on two OPA355 gain stages in cascade. The dual version, OPA2355, can also be used. An OPA355 achieves low input bias current,
+/-50pA MAZ, low voltage noise, 5.8nV/sq-rt Hz typical @ 1MHz, and it has good gain-bandwidth, 200MHz, and high slew rate, 300V/us. To maximize bandwidth in a 2-stage amplifier, each stage should be set to a gain of the square- root of the total cascaded amplifier gain. A triple op amp, OPA3355 can be cascaded to provide even higher BW at the same gain. (Created by Neil P. Albaugh TI- Tucson)
Wideband amplifier circuit:
Online Simulation of the “Wideband 75MHz 28dB Gain Amplifier” Circuit
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