公开(公告)号：US10044365B1

公开(公告)日：2018-08-07

申请号：US15843718

申请日：2017-12-15

Applicant: QUALCOMM Incorporated

Inventor： Liang Dai ,  Kentaro Yamamoto ,  Omid Rajaee ,  Li Lu ,  Dinesh Alladi ,  Changsok Han

IPC: H03M1/50 ,  H03L7/081 ,  H04W84/04 ,  H03M3/00

Abstract: Certain aspects of the present disclosure provide apparatus and techniques for analog-to-digital conversion using a time-to-digital converter (TDC). For example, certain aspects provide a quantizer using a TDC. The quantizer may include at least one first capacitive element and a set of switches configured to selectively couple a first terminal and a second terminal of the at least one first capacitive element to at least one input voltage source. The TDC may also include a reference voltage source, at least one switch coupled between the second terminal of the at least one first capacitive element and an output of the reference voltage source, a current source selectively coupled to the first terminal of the at least one first capacitive element, and a voltage sense circuit coupled to the first terminal of the at least one first capacitive element.

公开(公告)号：US10312927B1

公开(公告)日：2019-06-04

申请号：US15935988

申请日：2018-03-26

Applicant: QUALCOMM Incorporated

Inventor： Seyed Arash Mirhaj ,  Elias Dagher ,  Yongjian Tang ,  Dinesh Alladi ,  Masoud Ensafdaran ,  Lei Sun ,  Anand Meruva ,  Yuhua Guo ,  Balasubramanian Sivakumar

IPC: H03K4/08 ,  H03M1/10

Abstract: Certain aspects of the present disclosure provide methods and apparatus for calibrating time-interleaved analog-to-digital converter (ADC) circuits and generating a suitable signal for such calibration. Certain aspects provide a signal generator for calibrating a time-interleaved ADC circuit having a plurality of channels. The signal generator generally includes a pattern generator configured to receive a periodic signal and to output a bitstream based on the periodic signal and a conversion circuit having an input coupled to an output of the pattern generator and configured to generate a waveform based on the bitstream. The bitstream has a bit pattern with a total number of bits that shares no common factor with a number of the channels and includes a relatively lower frequency component combined with a relatively higher frequency component.