Replica network for linearizing switched capacitor circuits

A method for reducing track mode distortion in a switched capacitor circuit, comprising the steps of:

• (1) connecting a voltage input signal to a first node of a bridge circuit and to a signal conducting switch of the switched capacitor circuit, the signal conducting switch connected between the voltage input signal and a sampling capacitor of the switched capacitor circuit;
• (2) regulating a gate voltage of a MOSFET resistor disposed in a resistor branch of the bridge circuit to control the resistance of the MOSFET resistor;
• and
• (3) connecting said regulated gate voltage to a gate terminal of a signal conducting MOSFET switch in the switched capacitor circuit, thereby controlling the resistance of the signal conducting MOSFET switch so that it is independent of the voltage input signal, thereby reducing track mode distortion in the switched capacitor circuit.

A method for reducing signal distortion due to charge injection from a summing junction switch in a switched capacitor circuit, comprising the steps of:

• (1) connecting a voltage input signal to a first node of a bridge circuit and to a signal conducting switch of the switched capacitor circuit, the switched capacitor circuit having a sampling capacitor connected between the signal conducting switch and the summing junction switch;
• (2) regulating a gate voltage of a MOSFET resistor disposed in a resistor branch of the bridge circuit to control the resistance of the MOSFET resistor;
• and
• (3) connecting said regulated gate voltage to a gate terminal of a signal conducting MOSFET switch in the switched capacitor circuit, thereby controlling the resistance of the signal conducting MOSFET switch so that it is independent of the voltage input signal, thereby reducing signal distortion due to charge injection from the summing junction switch in the switched capacitor circuit.

A replica network that controls a resistance of a signal conducting MOSFET switch in a switched capacitor circuit, comprising:

• a voltage input signal connected to a bridge circuit and to the signal conducting MOSFET switch of the switched capacitor circuit, the signal conducting MOSFET switch connected to a sampling capacitor of the switched capacitor circuit;
• means for regulating a gate voltage of a MOSFET resistor disposed in a resistor branch of said bridge circuit to control a resistance of said MOSFET resistor;
• and
• means for connecting said regulated gate voltage to a gate terminal of the signal conducting MOSFET switch in the switched capacitor circuit, thereby controlling the resistance of the signal conducting MOSFET switch.