A low-power, high-speed, current-feedback op-amp with a novel Class AB high current output stage

A complementary bipolar low-power, high-speed, current-feedback operational amplifier is described. The amplifier incorporates a new Class AB output stage that enables high output current drive of 100 mA and large voltage swing within 1 V of the supply rails while operating at low quiescent current of 1.5 mA. The amplifier was fabricated in a junction-isolated complementary bipolar process with NPN/PNP f/sub t/ of 4.5/3.8 GHz. The amplifier, configured for noninverting gain of two and 100-/spl Omega/ load, provides 3-dB bandwidth of 110 MHz and 2-V pulse rise time of 7 ns.