Patent ID: 8466715
Filing Date: 2013-06-18
Classification: H03K

Abstract:
1. A comparator, comprising: a wide-swing operation transconductance amplifier (OTA), at least comprising a first and a second differential input pair for receiving a first and a second differential input signal respectively, the wide-swing OTA generating a first and a second intermediate output voltage in comparing the first and the second differential input signal; a current switch group; a current mirror group, wherein when an input common mode voltage of the first and the second differential input signal tends to one of a first and a second reference voltage, one of the first and the second differential input pair is turned off, and the current switch group and the current mirror group compensate a current flowing through the other of the first and the second differential input pair; and a decision circuit coupled to the wide-swing OTA, for enlarging a voltage difference between the first and the second intermediate output voltage to output a voltage comparison output signal.