Oscillators – Relaxation oscillators
Patent
1977-12-13
1979-10-30
Richardson, Robert L.
Oscillators
Relaxation oscillators
325465, 331 1A, H04B 106
Patent
active
041729978
ABSTRACT:
To provide a synthesized tuning frequency to control the local oscillator in a superheterodyne receiver, a frequency generating circuit includes a reference oscillator which provides a reference frequency which is frequency-divided to generate a plurality of divided sub-frequencies which, with respect to the reference frequency have at least a flank which is non-coincident with respect to corresponding flanks of other frequencies. These divided frequencies are added in an adder, the addition of which is controlled in accordance with a tuning command stored in a digital memory. Preferably, the adder is a NOR-gate to which selected frequencies are connected, selected by NAND-gates in accordance with a number provided by a digital tuning control and stored in the digital memory. The synthesized frequency is then used to provide an error control signal within a control loop connected to the local oscillator.
REFERENCES:
patent: 3405369 (1968-10-01), Couvillon
patent: 3651422 (1972-03-01), Underhill
patent: 3962644 (1976-06-01), Baker
Digital Methods Synthesize Frequency-Illingworth Electronic Design 11 May 1968, pp. 78-81.
Busse Wolfgang
Hegeler Wilhelm
Blaupunkt-Werke GmbH
Orsino Jr. Joseph A.
Richardson Robert L.
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