公开(公告)号：US09705521B1

公开(公告)日：2017-07-11

申请号：US15221109

申请日：2016-07-27

Applicant: Silicon Laboratories Inc.

Inventor： Timothy A. Monk ,  Rajesh Thirugnanam

IPC: H03M7/04 ,  H03M1/08 ,  H03M1/66

CPC classification number: H03M1/66 ,  H03M1/0665

Abstract: A noise-shaping signed digital-to-analog converter is described. A method includes selectively enabling a first sequence of unit elements of a plurality of unit elements of a digital-to-analog converter to convert a signed digital code to a plurality of analog signals in response to a plurality of control signals. Individual control signals of the plurality of control signals and individual analog signals of the plurality of analog signals correspond to respective unit elements of the plurality of unit elements. The method includes generating the plurality of control signals based on a pointer, a magnitude of the signed digital code, and a sign of the signed digital code. The method may include combining the plurality of analog signals with an output of a phase/frequency detector and charge pump in a phase-locked loop. The signed digital code may be an error signal based on a predetermined divide ratio of the phase-locked loop.

公开(公告)号：US09588497B1

公开(公告)日：2017-03-07

申请号：US15221078

申请日：2016-07-27

Applicant: Silicon Laboratories Inc.

Inventor： Timothy A. Monk ,  Rajesh Thirugnanam ,  Douglas F. Pastorello

IPC: H03M1/50 ,  G04F10/00 ,  H03M1/06 ,  H03M1/12 ,  H03M1/10

CPC classification number: G04F10/005 ,  H03L7/093 ,  H03L7/1075 ,  H03L7/1974 ,  H03L2207/50 ,  H03M1/60 ,  H03M1/804

Abstract: A feedback loop includes an oscillator-based analog-to-digital converter configured to convert an analog signal to a first digital value and a second digital value. The oscillator-based analog-to-digital converter includes a first oscillator having a first oscillation frequency configured to generate a first digital value based on a first signal component of the analog signal. The oscillator-based analog-to-digital converter includes a second oscillator having a second oscillation frequency configured to generate a second digital value based on a second signal component of the analog signal. The first and second signal components are complementary signal components. The feedback loop includes a combiner configured to generate a digital value based on the first digital value, the second digital value, and an offset code. The offset code has a value that increases a difference between the first oscillation frequency and the second oscillation frequency.

Abstract translation: 反馈环路包括基于振荡器的模拟 - 数字转换器，其被配置为将模拟信号转换为第一数字值和第二数字值。 基于振荡器的模数转换器包括具有第一振荡频率的第一振荡器，其被配置为基于模拟信号的第一信号分量产生第一数字值。 基于振荡器的模数转换器包括具有第二振荡频率的第二振荡器，其被配置为基于模拟信号的第二信号分量产生第二数字值。 第一和第二信号分量是互补信号分量。 反馈回路包括配置成基于第一数字值，第二数字值和偏移码产生数字值的组合器。 偏移码具有增加第一振荡频率和第二振荡频率之间的差的值。