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Unified analog input front end apparatus and method

  • US 7,049,989 B2
  • Filed: 10/01/2004
  • Issued: 05/23/2006
  • Est. Priority Date: 10/01/2004
  • Status: Active Grant
First Claim
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1. An analog input front end, comprising:

  • a configurable gain stage that is configured to receive an analog input signal and to provide a gain value to the analog input signal so as to output a gain-adjusted analog input signal that is within a particular voltage range between a maximum and a minimum value; and

    an analog-to-digital converter that is configured to receive the gain-adjusted analog input signal output from the configurable gain stage, and to perform analog-to-digital conversion on the gain-adjusted analog input signal, so as to output a digital signal that is indicative of the analog input signal,wherein the configurable gain stage comprises;

    a positive differential input signal stage including a first operational amplifier; and

    a negative differential input signal stage including a second operational amplifier,wherein the positive differential input signal stage further comprises;

    a first resistor and a first capacitor connected across the first operational amplifier and acting as a first frequency filter, andwherein the negative differential input signal stage further comprises;

    a second resistor and a second capacitor connected across the second operational amplifier and acting as a second frequency filter.

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