Apparatus for converting analog-format signals to pulse-format s

Details Apparatus for converting analog-format signals to pulse-format s Apparatus for converting analog-format signals to pulse-format s

1982-09-24

1986-10-07

Gruber, Felix D.

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340347AD, 340347M, 307260, 329126, H03M 508, G06G 720

Patent

active

046163328

ABSTRACT:
Apparatus for converting an analog-format electrical signal or quantity (such as the magnitude of an electrical circuit element) into a corresponding pulse-format signal, preferably in the form of a train of periodic pulses the lengths of which are controllable as a percentage of the cyclic period. A pulsed duty-cycle signal is developed in a negative feedback loop around an integrator having an analog-format input signal. The integrator output controls the d-c level of an up-and-down ramp signal which is fed to a comparator to produce pulses during the times the ramp voltage is above (or below) the firing threshold of the comparator. These pulses control a switch between the integrator input and a reference voltage so as to produce a negative feedback signal for the integrator. The negative feedback action controls the d-c level at the integrator ouptut and thereby sets the pulse duty-cycle to a value such that the average signal level through the pulsed switch to the integrator input relates in prescribed fashion to the applied input signal. The duty-cycle signal developed through such feedback action corresponds directly to the magnitude of the applied input signal.

REFERENCES:
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patent: 3712977 (1973-01-01), Rice, Jr.
patent: 3714470 (1973-01-01), Goldberg
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patent: 3842371 (1974-10-01), Kelly
patent: 3898447 (1975-08-01), Bozarth, Jr.
patent: 3942172 (1976-03-01), Tucker
patent: 4063236 (1977-12-01), Amemiya et al.
patent: 4109168 (1978-08-01), Raymond
patent: 4243975 (1981-01-01), Masuda et al.

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