Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Patent
1990-12-31
1991-10-01
Mis, David
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
375 22, H03K 708
Patent
active
050537296
ABSTRACT:
A pulse-width modulator accepts a 7 bit binary signal input which is gated to an adder circuit. The adder is also supplied with a constant binary 1 input and has an output that is coupled to an 8 bit delay circuit that has its output coupled back to another input of the adder. The delay circuit and adder act as a recursive filter that is reset when the gate circuit is opened every 128th count. The most significant bit in the output of the delay circuit is a direct measure of the corresponding pulse width of the binary signal and is coupled to an integrating circuit.
REFERENCES:
patent: 4160958 (1979-07-01), Mims et al.
patent: 4685114 (1987-08-01), Welling
Mis David
Zenith Electronics Corporation
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