Patent ID: 11936346
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. The analog front end of claim 12, wherein the amplifier circuit further comprises:
a first variable feedback circuit comprising:
a variable resistor coupled to the first input terminal;
a first switch coupled between the variable resistor and the output of the first gain stage; and
a second switch coupled between the variable resistor and a ground level; and

a second variable feedback circuit comprising:
a variable resistor coupled to the second input terminal;
a first switch coupled between the variable resistor and the output of the second gain stage; and
a second switch coupled between the variable resistor and a ground level;

wherein the control logic is further adapted to close the first switches and open the second switches in the first and second variable feedback circuits when selecting a first output gain for the first and second gain stages, and to open the first switches and close the second switches in the first and second variable feedback circuits when selecting a second output gain, lower than the first output gain, for the first and second gain stages.