High Input Impedance Switched-Capacitor Amplifier

A method, comprising:

• charging, during a first time period, by a plurality of buffer circuits based on respective input voltages of a plurality of input voltages, a corresponding plurality of sampling capacitors;
• modifying, during a second time period, respective amounts of charge stored in the plurality of sampling capacitors using the plurality of input voltages;
• combining respective charges for at least a subset of the plurality of sampling capacitors to generate a plurality of sample voltages;
• and
• amplifying, by an amplifier circuit, the plurality of sample voltages to generate an output signal.

A system comprising:

• a sampling circuit, wherein the sampling circuit includes:
• a first buffer circuit configured to, based on an input signal, charge a first plurality of capacitors during a first time period;
• a switch circuit configured to, during a second time period, cause a modification of an amount of charge stored on a first one of the first plurality of capacitors, wherein causing the modification of the amount of charge comprises the switch circuit coupling the input signal directly to the first one of the first plurality of capacitors;
• and
• an amplifier circuit configured to generate an output signal using sampling voltages based on respective amounts of charge present on ones of the plurality of capacitors.