Abstract
A novel high CMRR current output stage (COS) with QFG is presented in this paper. A novel common mode feedback (CMFB) is used to reject the common mode signal in order to achieve high CMRR. The common mode signal is omitted by the technique of adding the main signal and its opposite polarity one. 112 dB of CMRR is obtained in 0.35 μm CMOS technology with ±0.75 v supply voltage and only 182μw power dissipation which shows good improvement compared to the other work in the literature.
Highlights
Current operational amplifier (COA) have been used as feasible alternative to traditional voltage amplifier (VOA) in order to use in high accuracy closed loop IC configuration [1,2,3]
A novel high CMRR current output stage (COS) with Quasi floating gate (QFG) is presented in this paper
The common mode signal is omitted by the technique of adding the main signal and its opposite polarity one. 112 dB of CMRR is obtained in 0.35 μm CMOS technology with ±0.75 v supply voltage and only 182 μw power dissipation which shows good improvement compared to the other work in the literature
Summary
Current operational amplifier (COA) have been used as feasible alternative to traditional voltage amplifier (VOA) in order to use in high accuracy closed loop IC configuration [1,2,3]. [11] fixed the potential at the source of COA transistors by two auxiliary differential amplifier to improve CMRR These structures suffer from high power dissipation and high supply voltage. QFG transistors are the improved version of MIFG (Multiple Input Floating Gate) transistors [7] These circuits achieve LV operation by implementing capacitive voltage dividers at the transistor gate. In QFG transistors, to MIFG transistors, inputs are capacitively coupled to the transistor gate, but a very large-valued resistor weakly connects this gate to a dc bias voltage. In practice this resistor is implemented by a reverse-biased p-n junction of a PMOS transistor in cutoff [7].
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