公开(公告)号：US10965279B2

公开(公告)日：2021-03-30

申请号：US16360927

申请日：2019-03-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Yogesh Kumar Ramadass ,  Bhushan Talele ,  Shailendra Kumar Baranwal ,  Yinglai Xia ,  Junmin Jiang

IPC: H03F3/38 ,  H03K4/08 ,  H03F3/217 ,  H02M3/07 ,  H03L7/081 ,  H03L7/093 ,  H03L7/099

Abstract: A multi-level ramp generator comprises three ramp generators. The first ramp generator generates a first ramp signal, comprising a sawtooth voltage waveform with a first common mode voltage and a first peak to peak voltage. The second ramp generator generates a second ramp signal, comprising a sawtooth voltage waveform with a second common mode voltage and a second peak-to-peak voltage. The third ramp generator generates a third ramp signal, comprising a sawtooth voltage waveform with a third common mode voltage and the second peak-to-peak voltage. The second and third ramp signals are in phase with each other and the first ramp signal is 180° out of phase with the second and third ramp signals. In some implementations, each of the first, second, and third ramp generators comprise a respective delay locked loop and a respective voltage controlled oscillator.