Novel Chopper-Stabilized Correlated Double Sampling Multi-path Amplifier Circuit and Method Based on Miller Capacitor Reuse

A novel chopper-stabilized correlated double sampling multi-path amplifier circuit based on Miller capacitor reuse, wherein the circuit comprises:

• the analog differential input port Vin, the chopper circuit CH1, the calibration common-mode voltage input port Vicm1, the offset calibration switch group SW of the first-stage amplifier Gm1, the Gm1 offset calibration clock Φcal, the first-stage amplifier Gm1, the offset calibration circuit of Gm1, the correlated double sampling circuit, the second-stage amplifier Gm2, the output-stage amplifier Gm4, the second-stage Miller compensation capacitor group, the auxiliary amplifier Gm3, and the output port Vout,
• the offset calibration switch group SW of the first-stage amplifier Gm1 comprises switches SWc0, SWc1, SWc2, and SWc3;
• the second-stage Miller compensation capacitor group comprises capacitors CM20 and CM21;
• the analog differential input port Vin is connected to the input of the chopper circuit CH1 and to the input of the auxiliary amplifier Gm3;
• the input of the first-stage amplifier Gm1 is connected, through switches SWc1 and SWc2, to the calibration common-mode voltage input port Vicm1, and is further connected, through switches SWc0 and SWc3, to an output of the chopper circuit CH1;
• the Gm1 offset calibration clock Φcal serves as operating clock for the Gm1 offset calibration switch SW group to control switching operations thereof;
• the output of the first-stage amplifier Gm1 and the input of the Gm1 offset calibration circuit are connected to the input of the CDS circuit, and the output of the Gm1 offset calibration circuit is connected to the Cal port of the first-stage amplifier Gm1;
• the Vo1 and Vo2 output ports of the correlated double sampling circuit are connected to inputs of the second-stage amplifier Gm2, and the output Vo3 of the correlated double sampling circuit is connected to the output port Vout, the input of the output-stage amplifier Gm4 is connected to the output of the second-stage amplifier Gm2 and to the output of the auxiliary amplifier Gm3;
• the capacitors CM20 and CM21 are connected between the input and the output of the output-stage amplifier Gm4 respectively;
• the output of the output-stage amplifier Gm4 is connected to the output port Vout.