Low pass .pi. section digital phase shifter apparatus

Details Low pass .pi. section digital phase shifter apparatus Low pass .pi. section digital phase shifter apparatus

1985-08-20

1986-09-30

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

333 23, 333161, 333164, 307320, H03H 720, H01P 1185

Patent

active

046149210

ABSTRACT:
A low pass .pi. section digital phase shifter apparatus having an inductor and a diode connected in series between two identical parallel circuits. The parallel circuits connect to the series inductor/diode circuit at both the input and output and each circuit has inductor connected in parallel with a capacitor and a diode to provide balanced insertion loss at each diode switching state. When the diodes of the circuit are in the forward biased state they act as closed short circuit switches. When the diodes are reversed biased, the inductance in the series circuit resonates with the diode capacitance to provide a short circuit path to the RF signal to pass the center frequency of the RF signal at the desired phase.

REFERENCES:
patent: 3278866 (1966-10-01), Bose
patent: 3287626 (1966-11-01), Sprague
patent: 3718873 (1973-02-01), Garver
patent: 3745487 (1973-07-01), Milard et al.
patent: 3849676 (1974-11-01), Bareyt
patent: 3882431 (1975-05-01), Hopwood et al.
patent: 4255724 (1981-03-01), Bergero
"Broad-Band Diode Phase Shifters", by R. V. Garver, in IEEE Transactions On Microwave Theory and Techniques, vol. MTT-20, No. 5, May 1972, pp. 314-323.
"Simplified Switched Line Phase Shifter", by A. Schwarzmann, in DEP Symposium on MIC's, May 1971.

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