Operational Amplifiers Rail to Rail Input Stages Using Complementary Differential Pairs
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منابع مشابه
A Robust and Universal Constant-gm Circuit Technique for Low- Voltage Rail-to-Rail Amplifiers
− A universal and robust circuit technique to maintain a constant transconductance in rail-to-rail amplifiers, based on an input stage made up of parallelconnected complementary differential pairs, is introduced in this paper. The principle of operation consists of comparing the total transconductance with a reference value and then, appropriated tail currents are generated for the complementar...
متن کامل0 . 9 V rail - to - rail constant gm CMOS amplifier input stage
Presented is a 0.9 V rail-to-rail constant gm CMOS amplifier input stage consisting of complementary differential pairs and a gm control circuit. The gm control circuit eliminates the gm dead zone, which occurs in the conventional rail-to-rail amplifier with ultra-low supply voltages. The proposed amplifier input stage has a constant gm that varies by +2.3% for rail-to-rail input common-mode le...
متن کاملHigh slew rate, low voltage BiCMOS and bipolar operational amplifier architectures with rail to rail - Circuits and Systems, 1994. ISCAS '94., 1994 IEEE International Symposium on
Class AB differential amplifiers using composite BiCMOS and bipolar transistors are introduced. Their utilization for the implementation of low voltage (+-1.65V) operational amplifiers with high slew rate and rail to rail common mode input voltage range is discussed.
متن کاملV Rail-to-rail Constant-g M Cmos Op Amp
A 1 V rail-to-rail constant-gm CMOS operational amplifier is proposed. This study shows that keeping the sum of currents in the complementary differential pairs constant rather than controlling the tail currents produces a constant-gm input stage operating in the weak inversion. The currents in the n-channel differential pair are regulated to keep the sum of currents in the complementary differ...
متن کاملRail to rail CMOS complementary input stage with only one active differential pair at a time
A simple scheme for rail to rail op-amp operation is introduced. The input stage uses complementary differential pairs but only one pair is active at a time. It uses very compact control circuitry. Experimental verification is provided from a test chip prototype in 0.5 μm CMOS technology.
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تاریخ انتشار 2002