Constant gm rail-to-rail CMOS OpAmp with only one differential pair and switched level shifters
| Autor: | Antonio J. Lopez-Martin, Jaime Ramirez-Angulo, Alejandro Roman-Loera, Ramon G. Carvajal, M. R. Valero |
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| Rok vydání: | 2015 |
| Předmět: |
Power supply rejection ratio
Engineering Input offset voltage business.industry Amplifier Electrical engineering Hardware_PERFORMANCEANDRELIABILITY law.invention Integrated injection logic CMOS law Current sense amplifier Hardware_INTEGRATEDCIRCUITS Electronic engineering Operational amplifier Common-mode signal business |
| Zdroj: | ISCAS |
| DOI: | 10.1109/iscas.2015.7169183 |
| Popis: | This paper introduces a simple approach for the implementation of rail-to-rail operational amplifiers (OpAmps) with constant g m using only one differential input pair. It is based on the utilization of switched voltage followers that introduce a DC level shift when the OpAmp's common mode input voltage is lower than the headroom of the input differential pair (DP). Additional circuitry is introduced in order to make the DP tail current insensitive to common mode input voltage variations. This improves CMRR and PSRR and reduces g m variations. The additional circuitry increases power dissipation by less than 20%. Simulation results are presented that verify rail-to-rail operation with ±1.65 supply voltages in 0.5μm CMOS technology. |
| Databáze: | OpenAIRE |
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