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Feed-forward analog-to-digital converter (ADC) with a reduced number of amplifiers and feed-forward signal paths

  • US 8,643,524 B1
  • Filed: 09/27/2012
  • Issued: 02/04/2014
  • Est. Priority Date: 09/27/2012
  • Status: Active Grant
First Claim
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1. A delta-sigma modulator circuit, comprising:

  • a loop filter comprising a plurality of cascaded single op-amp switched-capacitor integrator stages, wherein at least one of the switched-capacitor integrator stages has a switched capacitor input network coupled to an input terminal of the loop filter and to the input of the amplifier and operated according to a clock, a capacitive feedback network connected from an output of an amplifier of the at least one switched-capacitor integrator stage to an input of the amplifier, wherein the capacitive feedback network includes at least two capacitors coupled in series at a common terminal, wherein the common terminal is coupled to a reference voltage source by a switched-capacitor shunt network operated according to the clock; and

    a quantizer having an input coupled to the output of the loop filter and an output coupled to an input of the loop filter, wherein the delta-sigma modulator noise-shapes a signal provided to a second input of the loop filter as represented in an average value of the output of the quantizer.

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