Power-Efficient Single-Stage Class-AB OTA Based on Non-Linear Nested Current Mirrors

卷:70

Article

关键词: RECYCLING FOLDED CASCODE;    LOW-VOLTAGE;    FLOATING-GATE;    SLEW RATE;    DRIVER;    ENHANCEMENT;    DESIGN;    FILTER;   

DOI  :  10.1109/TCSI.2023.3239757

来源: SCIE

【 摘 要 】

A novel approach to design low-power area-efficient rail-to-rail output single-stage class-AB operational transconductance amplifiers (OTAs) with enhanced large-and small-signal performance to drive large capacitive loads is presented. It is based on a non-linear nested current mirror at the active load of a splitted differential input pair biased in weak inversion that boosts dynamic currents beyond their quiescent value directly at the output branch. As a result, slew rate, DC gain, gain bandwidth product, settling time and noise performance are improved without additional circuit elements or power consumption. An OTA prototype has been fabricated in a 180-nm CMOS process, consuming a quiescent power of 2.9 mu W from a supply voltage of +/- 0.5 V and a silicon area of 0.001 mm(2). Measurement results validate the advantages of the proposal, exhibiting positive and negative slew rates of 110 V/ms and -58 V/ms, respectively, and a gain-bandwidth product of 136 kHz with a phase margin of 90? for a capacitive load of 160 pF.

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