×

Analog-to-digital converter with sigma-delta duty cycle encoded output

  • US 5,559,514 A
  • Filed: 08/09/1994
  • Issued: 09/24/1996
  • Est. Priority Date: 04/27/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. An analog-to-digital converter (ADC), comprising:

  • a clock having a frequency output that can vary with temperature, anda modulating circuit connected to receive an input analog signal and to operate in response to said clock output, said modulating circuit producing a digital output with a duty cycle that corresponds to an input analog signal generally independent of the clock frequency,said modulating circuit comprising a sigma-delta modulator which receives said input analog signal, and an output circuit which responds to said sigma-delta modulator and to said clock output to produce said digital output, wherein said clock output and an output signal from said sigma-delta modulator are selectively applied one-at-a-time as inputs to said output circuit.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×