Sample and hold circuit for a current mode pipelined analog-to-digital converter

A pipelined current mode analog-to-digital converter stage, comprising:

• first and second parallel sample and hold circuits configured to receive an analog signal having a current;
• said first and second sample and hold circuits each comprising at least first and second outputs, said first output being a current from a current copier and said second output being a current from a current mirror;
• and
• a current mode analog-to-digital converter configured to alternately output a digital signal of said second output of said first and second sample and hold circuits;
• a current mode digital-to-analog converter to convert said digital signal to an analog signal,
• wherein an output of said digital-to-analog converter is connected to said first output of each of said first and second sample and hold circuits.

A method for converting an analog signal to a digital signal, comprising:

• sampling and holding an analog signal having a current using at least one current mode sample and hold circuit;
• outputting a first output of said analog signal from a current copier of said at least one sample and hold circuit, and a second output of said analog signal from a current mirror of said at least one sample and hold circuit;
• converting said second output to a digital signal using a current mode analog-to-digital converter;
• converting said digital signal back to an analog signal using a current mode digital-to-analog converter;
• and
• subtracting an output of said digital-to-analog converter from said first output.