Analog to digital converter

Details Analog to digital converter Analog to digital converter

1981-06-02

1984-09-11

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, H03K 1302

Patent

active

044713401

ABSTRACT:
A device for converting a signal voltage into a multi-bit digital word that efines the voltage magnitude and polarity. The input voltage V to be digitized is used to control the frequency of a voltage controlled oscillator, whose output is defined to be f=f.sub.o +kV. The signal out of the voltage controlled oscillator is fed to differential delay line filters that permit all digits to be derived in parallel. The filters comprise pairs of delay lines of unequal length, each pair feeding a respective phase detector whose output is amplified, and diode-rectified and limited. To increase the accuracy of this device, an automatic frequency control loop can be incorporated to control f.sub.o. This loop zeros V occasionally and reads the output digital word to measure the frequency error and add a correcting voltage to the input voltage V when it is not zeroed for the measurement.

REFERENCES:
patent: 3007149 (1961-10-01), Brown
patent: 3189820 (1965-06-01), Lowman
patent: 3521269 (1970-07-01), Brooks et al.
patent: 3533101 (1970-10-01), Lauchner et al.
patent: 3613067 (1971-10-01), Haberle
patent: 3617900 (1971-11-01), Fink
patent: 3710376 (1973-01-01), Fluegel
patent: 3737891 (1973-06-01), Metcalf
patent: 3745559 (1973-07-01), Mattern
patent: 4188628 (1980-02-01), Langeraar

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