Programmable gain amplifier with multi-range operation for use in body sensor interface applications

摘要

A system for analyte measurement includes a programmable gain amplifier including a first input terminal operatively coupling to the output of a sensor for sensing an analyte, a second input terminal operatively coupling to a voltage source, and an output terminal for providing an output based on a difference between inputs on the first input terminal and the second input terminal A controller is operatively coupled to the programmable gain amplifier for configuring the operation range of the programmable gain amplifier and/or selecting the output of the programmable gain amplifier for analyte measurement. The method includes monitoring an output from a programmable gain amplifier operatively coupling to a sensor for sensing an analyte, and controlling the operation range of the programmable gain amplifier, and/or selecting the output of the programmable gain amplifier for analyte measurement.

主权项

1. A system for analyte measurement, comprising:
a transimpedance amplifier including a first input terminal configured for operatively coupling to an output of a sensor for sensing an analyte, a second input terminal coupled to a voltage source, and an output terminal that provides an output based on a difference between first and second inputs on the first input terminal and the second input terminal; a differential programmable gain amplifier (DPGA) having a first input terminal coupled to the output of the output terminal of the transimpedance amplifier and a second input terminal coupled to a reference voltage source and that provides an output based on a difference between the first and second input terminals of the DPGA, the DPGA including first and second programmable buffers with each of the first and second terminals of the DPGA coupled to an output of a respective one of the first and second programmable buffers wherein the first and second programmable buffers each have a plurality of selectable operation ranges where each selectable operation range has a different linearity region and wherein at least one operation range of the plurality of selectable operation ranges is selected responsive to a control signal; and a controller operatively coupled to the DPGA, wherein the controller forms a state of the control signal responsively to an input common mode voltage of each of the first and second programmable buffers, the control signal coupled between the controller and the first and second programmable buffers.