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A voltage feedback op amp responds to a voltage difference between the inputs, while a current feedback op amp responds to a current difference between the inputs. Both inputs on a voltage feedback op amp are high impedance. In a current feedback op amp, the non-inverting input has a high impedance while the inverting input has a low impedance. Voltage feedback op amps also have a constant gain bandwidth product, which means if an op amp’s BW is 100MHz at a gain of 2, the gain BW product is 200MHz.
PTM Published on: 2009-01-26
