Digitally controlled monolithic active phase shifter apparatus h

Details Digitally controlled monolithic active phase shifter apparatus h Digitally controlled monolithic active phase shifter apparatus h

1988-10-13

1991-02-19

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Delay lines including long line elements

333104, 330277, 330311, 307571, H03H 1120

Patent

active

049947737

ABSTRACT:
A digitally controlled active phase shifter with vernier control consists of a 180 degree phase bit in series with a 90 degree bit and a digitally controlled active vector generator with vernier control. The digitally controlled active vector generator consists of an active power divider with digitally adjustable amplitude, a pair of phase delay networks with an active power combiner employing vernier control. The power divider consists of two sets of parallel pairs of FET's in cascode configuration with all input nodes connected together and all output nodes from the same set tied together. The FET at the output node of each pair is a common gate configuration with its gate RF grounded through a bypass capacitor. The gate bias voltage is applied to the common gate FET to switch it ON or OFF to thereby provide a set of desired signal amplitudes which can be obtained by selecting the gain of each of the cascode stages in each of the parallel pairs. Two output signals from the power divider are fed into a pair of phase delay networks to get 90 degree phase differences. The two 90 degree out of phase signals are then combined by an active power combiner which consists of two pairs of FET's in cascode configuration with their output nodes connected together. The combined signal while maintaining constant amplitude can have phase variations beteen 0-90 degrees according to the amplitude ratio of the two 90 degree out of phase signals. The gate bias voltage applied to the two common gate FET's of the power combiner can be varied continuously to give additional phase variations of the combined signal at the output.

REFERENCES:
patent: 4405907 (1983-09-01), Breese et al.
patent: 4458219 (1984-07-01), Vorhaus
patent: 4549152 (1985-10-01), Kumar
patent: 4599585 (1986-07-01), Vorhaus et al.
Selin, John R.; "Continuously Variable L-Band Monolithic GaAs Phase Shifter"; Microwave Journal; Sep. 1987; pp. 211-218.
Naster et al.; "Affordable MMIC Designs for Phased Arrays"; Microwave Journal; Mar. 1987; pp. 141-148.
Microwave Semiconductor Circuit Design, W. Allen Davis, Van Nostrand Reinhold Co. (1984), pp. 264-293. Monolithic Dual-Gate AsAs FET Digital Phase Shifter, J. L. Vorhaus et al., IEEE Trans. on Microwave Theory and Techniques, vol. MTT-30, No. 7, Jul. 1982, pp. 982-991.
A Monolithic Single-Chip X-Band Four-Bit Phase Shifter, Y. Ayasly, et al., IEEE Trans. on Microwave Theory and Tech., vol. MTT-30, No. 12, Dec. 1982, pp. 2201-2205.

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