Programmable Gain Amplifier Based on Chopper Stabilization Technique
To meet the low-noise and low-offset requirements of analog front-end detection circuits,a programmable gain amplifier based on chopper stabilization technique fabricated using 0.18 μm CMOS process is introduced.The chopper stabilization technique is employed to reduce offset and low-frequency 1/f noise,while the programmable gain stage is used to improve the utilization of the analog front-end cir-cuit's output swing,meeting detection needs in various environments.The amplifier's equivalent input noise integral value from 1 Hz to 10 kHz is 1.43 μV,and it achieves an op-amp input impedance of 4.52 GΩusing an impedance enhancement circuit.A C-2C capacitor array is adopted as a variable capacitor array,enabling gain adjustment from 0 to 15 times with a minimum step of 1/64,which has wide application scenarios for low-noise circuits requiring fine-tuned gain adjustment.
Chopper stabilization techniqueProgrammable gain amplifierImpedance enhancement circuit
万方数据
维普
