Folded floating-gate differential pair amplifier

摘要

A floating-gate MOS differential pair amplifier has a regulating feedback voltage whose swing is folded up into the same range over which the input and output voltages swing. In one embodiment, output currents are mirror copies of differential pair currents whose sum is regulated. In a further embodiment, feedback that regulates the sum of the currents is provided to an extra control gate connected to the floating gates. The control gate comprises a capacitive voltage divider in one embodiment that is coupled to gates in the differential pair and in the current mirror.