US PATENT SUBCLASS 331 / 12
.~.~.~ With phase-shifted inputs

Current as of: June, 1999
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331 /   HD   OSCILLATORS

1 R  DF  AUTOMATIC FREQUENCY STABILIZATION USING A PHASE OR FREQUENCY SENSING MEANS {16}
10  DF  .~ Plural A.F.S. for a single oscillator {2}
11  DF  .~.~ Plural comparators or discriminators {1}
12.~.~.~ With phase-shifted inputs

DEFINITION

Classification: 331/12

(under subclass 11) Subject matter wherein at least two comparators are so arranged that the outputs of the controlled oscillator and a reference oscillator are directly compared in one comparator and the output of the controlled oscillator is phase-shifted and then compared with the reference oscillator in a second comparator, the outputs of the comparators then being combined in a control circuit to effect tuning of the controlled oscillator.