Digitally controlled oscillator apparatus

Details Digitally controlled oscillator apparatus Digitally controlled oscillator apparatus

1988-05-06

1989-12-19

Heckler, Thomas M.

Boots, shoes, and leggings

36493471, 364947, 375118, G06F 104

Patent

active

048887293

ABSTRACT:
A variable frequency oscillator which is completely digital and does not use high frequency parts higher than 50 megahertz and yet operates at 50 MHz. Variable frequency is obtained by increment and decrement inputs supplied to a control block which selects between selected phase holding signal inputs obtained from an external source. The output pulse is returned to the control mechanism to start the cycle over. Internal to the control is an algorithm or control sequence which uses a make-before-break approach to prevent glitches which tend to occur during change of phase.

REFERENCES:
patent: 4241418 (1980-12-01), Stanley
patent: 4257108 (1981-03-01), Igel
patent: 4431969 (1984-02-01), Summers et al.
patent: 4656649 (1987-04-01), Takahashi
patent: 4680621 (1987-07-01), Baker et al.

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