公开(公告)号：US11444635B2

公开(公告)日：2022-09-13

申请号：US17061647

申请日：2020-10-02

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Amit Kumar Gupta ,  Peng Cao

IPC: H03M3/00

Abstract: A delta-sigma modulator includes a first amplifier having an input, a feedback control input, and an output. The input is a first input of the delta-sigma modulator. The delta-sigma modulator further includes a first integrator and a first quantizer. The first integrator has an input and an output. The output of the first amplifier is coupled to the input of the first integrator. The first quantizer has an input and an output. The output of the first quantizer is coupled to the feedback control input of the first amplifier.

公开(公告)号：US09979411B1

公开(公告)日：2018-05-22

申请号：US15394100

申请日：2016-12-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Amit Kumar Gupta ,  Peng Cao ,  Venkata Krishnan Kidambi Srinivasan

IPC: H03M3/00

CPC classification number: H03M3/484 ,  H03M3/00 ,  H03M3/464

Abstract: An exemplary circuit includes a tracking circuit, a current estimator, a switch control logic, and a switching load circuit. The tracking circuit tracks a digital output signal of a delta-sigma modulator (DSM) and provides a tracking signal representing an average of the digital output signal during a time period. The current estimator determines an amount of loading to be applied to positive and negative reference voltages based on the tracking signal. The switching load circuit is coupled to positive and negative reference voltages of the DSM, the switching load circuit connects a selected amount of loading to the positive and negative reference voltages in response to a control signal to balance a reference load current applied to the DSM. The switch control logic provides the control signal to the switching load circuit based on the determined amount of loading to be applied to the positive and negative reference voltages.