Unified analog input front end apparatus and method
First Claim
Patent Images
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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Abstract
An analog input front end includes a configurable gain stage and an analog-to-digital converter. The configurable gain stage receives an analog input signal, such as a differential analog input signal, and provides 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. The analog-to-digital converter receives the gain-adjusted analog input signal and performs 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.
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Citations
13 Claims
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1. An analog input front end, comprising:
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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, and wherein 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. - View Dependent Claims (2, 3)
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4. A configurable gain stage, comprising:
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a positive differential input signal stage that includes a first resistor having a first resistance value, a second resistor having a second resistance value, and a first operational amplifier; and a negative differential input signal stage that includes a third resistor having the first resistance value, a fourth resistor having the second resistance value, and a second operational amplifier; and first through sixth switches, the first and second switches being provided on the positive differential input signal stage, the third and fourth switches being provided on the negative differential input signal stage, the fifth switch being provided between the positive and negative differential input signal stages, and the sixth switch being provided between a ground potential and at least one of the positive and negative differential input signal stages, wherein the configurable gain stage is capable of operating in a first mode of operation providing a gain value greater than unity to an input differential signal pair, a second mode of operation providing a unity gain value to the input differential signal pair, and a third mode of operation provide a gain value greater than zero but less than unity to the input differential signal pair. - View Dependent Claims (5, 6, 7, 8)
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9. A calibration circuit for a gain stage and analog-to-digital converter unit, the calibration circuit comprising:
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an operational amplifier; a digital-to-analog converter; a resistor ladder provided between the operational amplifier and the digital-to-analog converter; a voltage reference unit connected to the digital-to-analog converter; and a plurality of switches that provide an on/off connection to the gain stage and the analog-to-digital converter unit, wherein the calibration circuit is configured to maintain a total error of the gain stage and the analog-to-digital converter unit to be less than a predetermined value, for all operating modes of the gain stage and the analog-to-digital converter. - View Dependent Claims (10, 11, 12, 13)
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Specification