Patent ID: 8947281
Filing Date: 2015-02-03
Classification: H03K,H03M

Abstract:
1. An apparatus comprising: a first digital-to-analog converter (DAC) including a data input configured to receive a digital input signal and an output configured to generate an output current, wherein the first DAC comprises an active termination circuit including one or more p-type metal oxide semiconductor (PMOS) termination transistors and one or more n-type metal oxide semiconductor (NMOS) termination transistors; and a bias circuit configured to generate a first bias voltage and a second bias voltage, wherein the first bias voltage is configured to control a small signal resistance of the one or more PMOS termination transistors, wherein the second bias voltage is configured to control a small signal resistance of the one or more NMOS termination transistors, and wherein the one or more PMOS termination transistors and the one or more NMOS termination transistors provide active termination to the output of the first DAC.