公开(公告)号：US20210391871A1

公开(公告)日：2021-12-16

申请号：US17337619

申请日：2021-06-03

Applicant: QUALCOMM Incorporated

Inventor： Xilin LIU ,  Nitz SAPUTRA ,  Behnam SEDIGHI ,  Ashok SWAMINATHAN ,  Dongwon SEO

IPC: H03M1/74 ,  G05F3/26 ,  H04B1/04

Abstract: Methods and apparatus for adaptively generating a reference voltage (VREF) for biasing a switch driver and corresponding switch in a digital-to-analog converter (DAC). The adaptive biasing scheme may be capable of tracking process, voltage, and temperature (PVT) of the DAC. An example DAC generally includes a plurality of DAC cells, each DAC cell comprising a current source, a switch coupled in series with the current source, and a switch driver coupled to a control input of the switch, the switch driver being configured to receive power from a first power supply rail referenced to a reference potential node; a regulation circuit comprising a first transistor coupled between the reference potential node for the DAC and the switch driver in at least one of the plurality of DAC cells; and a VREF generation circuit coupled to the regulation circuit and configured to adaptively generate a VREF for the regulation circuit.