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Gain-enhanced feedforward path compensation technique for pole-zero cancellation at heavy capacitive loads

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2 Author(s)
Chan, P.K. ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Chen, Y.C.

An improved frequency compensation technique is presented in this paper. It is based on a cascade of a voltage amplifier and a transconductor to form a composite gain-enhanced feedforward stage in a two-stage amplifier so as to broaden the gain bandwidth via low-frequency pole-zero cancellation at heavy capacitive loads, but yet without increasing substantial power consumption. The technique has been confirmed by the experimental results. An operational amplifier has been designed to drive a capacitive load of 300 pF. The amplifier exhibits a dc gain of 87 dB, a gain bandwidth of 10.4 MHz at 63.7° phase margin, an average slew rate of 3.5 V/μs, a compensation capacitor of only 6 pF while consuming 2.45 mW at a 3-V supply in a standard 0.6-μm CMOS technology.

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:50 ,  Issue: 12 )