公开(公告)号：US10763889B1

公开(公告)日：2020-09-01

申请号：US16661456

申请日：2019-10-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Uttam Kumar Agarwal ,  Anand Kannan ,  Ramamurthy Vishweshwara ,  Anand Subramanian ,  Pedro Ramon Gelabert ,  Diljith Mathal Thodi ,  Abhijit Anant Patki

IPC: H03M3/00 ,  H03G3/00 ,  H03G1/00 ,  H03G3/30 ,  H03M7/34 ,  H03M1/12 ,  H03M1/06 ,  H03G5/02

Abstract: A circuit includes a programmable gain amplifier (PGA) having a PGA output. The circuit further includes a delta-sigma modulator having an input coupled to the PGA output. The circuit also includes a digital filter and a dynamic range enhancer (DRE) circuit. The digital filter is coupled to the delta-sigma modulator output. The DRE circuit is coupled to the delta-sigma modulator output and to the PGA. The DRE circuit is configured to monitor a signal level of the delta-sigma modulator output. Responsive to the signal level being less than a DRE threshold, the DRE circuit is configured to program the PGA for a gain level greater than unity gain and to cause the digital filter to implement an attenuation of a same magnitude as the gain level to be programmed into the PGA.