Patent ID: 6046875
Filing Date: 2000-04-04
Classification: G11B,H03F

Abstract:
A transconductance circuit for providing an approximate linear response, comprising:a differential input operable to receive a transconductance circuit differential input voltage;a differential output operable to provide a transconductance circuit differential output current;a first, a second, and a third differential pair, each differential pair operable to receive a differential voltage, each differential pair connected to a current sink, the current sink connected to the first differential pair being operable to sink a current having a magnitude that is different from the magnitude of the current sunk by the current source connected to the second differential pair and the current sink connected to the first differential pair is also different from the magnitude of the current sunk by the current source connected to the third differential pair;an offset and divider circuit operable to receive a differential voltage indicative of the transconductance circuit differential input voltage and in response provide a first differential voltage to the first differential pair, a second differential voltage to the second differential pair, and a third differential voltage to the third differential pair, the first, second, and third differential voltages each having different common-mode levels; andwherein the first, second, and third differential pairs produce the transconductance circuit differential output current at the differential output in response to receiving the first, second, and third differential voltages, respectively.