A Low-Voltage Fully Differential Constant-Gm Rail-to-Rail CMOS Operational Amplifier

被引：0
|
作者：
Giuseppe Ferri
Willy Sansen
Vincenzo Peluso
机构：
[1] Universita’ L’Aquila,
[2] Katholieke Universiteit Leuven,undefined
来源：
Analog Integrated Circuits and Signal Processing | 1998年 / 16卷
关键词：
low-voltage low-power analog integrated circuits; fully differential; constant-g; operational amplifiers;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A low-voltage fully differential CMOS operational amplifier withconstant-gmand rail-to-rail input and output stages ispresented. It is the fully differential version of a previously realizedsingle-ended operational amplifier where a novel circuit to ensure constanttransconductance has been implemented [1]. The input stage is a rail-to-railstructure formed by two symmetrical OTAs in parallel (the input transistorsare operating in weak inversion). The class-AB output stages have also afull voltage swing. A rail-to-rail input common mode feedback structureallows the output voltage control. Measurements in a 0.7 µ standardCMOS process with threshold voltages of about 0.7 V have been done. Theminimum experimental supply voltage is about 1.1 V. The circuit provides a60 dB low frequency voltage gain and about 1.5 MHz unity gain frequency fora total power consumption of about 0.72 mW at a 1.5 V supply voltage.
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页码：5 / 15
页数：10
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