Patent ID: 9209790
Filing Date: 2015-12-08
Classification: H03K

Abstract:
1. A comparator, comprising: a voltage divider that develops a midpoint voltage between a voltage on a power rail and a voltage on a low-voltage rail; a current mirror comprising a first transistor stack connected to a second transistor stack, wherein: a compensation circuit coupled between the first and second bias nodes that prevents oscillations in the comparator; a first inverter comprising a third transistor stack, wherein the first inverter receives a reference signal and establishes a third current through the third transistor stack, the third current being determined partially by the reference signal and partially by the first and second bias signals; and a second inverter comprising a fourth transistor stack, wherein the second inverter receives an input signal for comparison to the reference signal and establishes a fourth current through the fourth transistor stack, the fourth current being determined partially by the input signal and partially by the first and second bias signals, the fourth transistor stack generates an output signal the magnitude of which is an indication whether the input signal is greater than or less than the reference signal.