公开(公告)号：US20200304139A1

公开(公告)日：2020-09-24

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 ,  H03G3/30 ,  H03G1/00 ,  H03G3/00

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.