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

Claim 2:
3. An amplifier circuit, comprising:
an input node for receiving an input signal;
a gain stage, having an input and an output;
a digital step attenuation circuit, having an input and an output coupled to the input of the gain stage, and adapted to apply a selected attenuation to a signal received at the input node;
an input capacitor having a first terminal coupled to the input of the digital step attenuation circuit and a second terminal coupled to an output of the digital step attenuation circuit to receive a voltage corresponding to an opposite polarity voltage corresponding to the received signal as attenuated by the digital step attenuation circuit;
control logic adapted to control the digital step attenuation circuit to apply a selected attenuation to a received signal at the input of the digital step attenuation circuit; and
a variable output resistor, coupled between the output of the gain stage and a ground level;
wherein the control logic is further adapted to control the variable output resistor to select an output gain of the gain stage.