Electronic phase shifter circuit and method

Details Electronic phase shifter circuit and method Electronic phase shifter circuit and method

1984-09-13

1987-05-05

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 307511, 330261, H03K 500, H03K 112

Patent

active

046635947

ABSTRACT:
A double balanced modulator is combined with a circuit for providing a quadrature current signal and a current steering circuit to produce a substantially constant amplitude output signal having a phase that is continuously shifted over a range of 180 degrees in response to a dc control voltage signal being varied from a maximum value to a minimum value. The balanced modulator includes an input differential amplifier circuit coupled with a mixer circuit portion thereof with the mixture circuit portion receiving a first alternating signal at the inputs thereof. The circuit for providing the quadrature current signal is coupled between the outputs of the mixer circuit portion and a circuit node of the differential amplifier circuit of the balanced modulator and receives a second alternating signal that is in quadrature phase relationship to the first alternating signal. A quadrature current signal is produced and summed at the outputs of the mixer circuit portion with the output current signal produced at the output of the balanced modulator.The current steering control circuitry is coupled with both inputs of the differential amplifier means and the circuit for providing the quadrature current signal to control the biasing thereof such that in response to the magnitude of the dc control voltage signal being varied from a maximum value to a minimum value the magnitude of the quadrature current signal is varied inversely with respect to the magnitude of the output signal produced from the output of the balance modulator to produce the constant amplitude output signal of the phase shifter.

REFERENCES:
patent: 3852624 (1974-12-01), Marik et al.
patent: 3961360 (1976-06-01), Sato et al.
patent: 4052679 (1977-10-01), Hosoya
patent: 4058771 (1977-11-01), Ohsawa et al.
patent: 4480337 (1984-10-01), Graziadei et al.

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