Abstract
A bulk-driven low-impedance compensation technique is proposed for ultra-low supply voltage amplifiers. By using the low resistance node of the current mirror of input, the efficiency of Miller compensation capacitor is greatly improved. By using this compensation method, a rail-to-rail input & output bulk-driven fully differential operational amplifier is also presented in the paper. The effectiveness of the circuit has been verified in a 65 nm CMOS process, the proposed three-stage amplifier has over 70.69 dB gain, 19.95 kHz gain-bandwidth product, and 69.7° phase margin while consuming only 8.72 nW power, and occupying die area of 0.00082 mm2 from a 0.3 V supply while driving a 100pF load.
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