关键词: AB类；全差分；全工艺角

Abstract: This paper presented a high-speed class-AB fully-differential operational amplifier. Modified from traditional two-stage single-ended structure, it becomes a class-AB input and output fully differential operational amplifier. The bandwidth and slew rate were improved without decreasing the gain. The amplifier was designed on JAZZ 0.18μm CMOS process, To ensure the robustness, the simulation covered all the process corners. The results showed that the dc open-loop gain was over 80 dB, the UGF was over 170.74 MHz, the slew rate was over 150 V/μm, the quiescent current was less than 5.8 mA on the 3.3 V±10% supply voltage, 5 pF load capacitor and the temperature of -40~125℃. The layout area is very small which is only 0.017 mm2. After extracting the parasitic parameters, the post-simulation results showed it was well matched with the schematic level simulation.

Key words: class-AB; fully-differential; all the process corners