Variable phase shifting apparatus

Details Variable phase shifting apparatus Variable phase shifting apparatus

1977-05-02

1978-07-18

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

328 55, 328155, 323128, 323122, G05F 168

Patent

active

041018214

ABSTRACT:
Variable phase shifting apparatus for selectively altering the phase of an AC signal. The signal is conducted through a series of stages. Each stage includes an operational amplifier having an input resistor and a feedback resistor. A capacitor is associated with either the input resistor or with the feed-back resistor. The capacitor may be connected into or disconnected from the stage by a digital switch. When the capacitor is connected, the stage produces a particular amount of shift in the phase of the AC signal, and when the capacitor is disconnected, the AC signal is conducted through the stage with no change in phase. By employing stages capable of producing different amounts of phase shift any of a set of amounts of phase shifts may be obtained.

REFERENCES:
patent: 3130362 (1964-04-01), MacMillan
patent: 3418418 (1968-12-01), Wilder
patent: 3612916 (1971-10-01), O'Neill
patent: 4039930 (1977-08-01), Lukas

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