Phase quadrature signal generator having a variable phase shift

Details Phase quadrature signal generator having a variable phase shift Phase quadrature signal generator having a variable phase shift

1997-10-31

1999-11-09

Bost, Dwayne D.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

327231, 327237, H04B 140

Patent

active

059830824

ABSTRACT:
A variable phase shift network (420) for a phase quadrature signal generator (320, 370) includes a variable current controller (909), a first NPN transistor (801) and a second NPN transistor (802). The variable phase shift network (420) produces a first quadrature input signal (830), a second quadrature input signal (834), a first quadrature output signal (821) and a second quadrature output signal (826) responsive to receiving a first differential input signal (919) and a second differential input signal (925). The variable current controller (909) controls current in a first NPN transistor (801) to vary an emitter resistance (846) in the first NPN transistor (801) and controls current in a second NPN transistor (802) to vary an emitter resistance (847) in the second NPN transistor (802) to adjust a phase quadrature relationship between the first quadrature output signal (821) and the first quadrature input signal (830) and to adjust a phase quadrature relationship between the second quadrature output signal (826) and the second quadrature input signal (834).

REFERENCES:
patent: 5179731 (1993-01-01), Trankle et al.
patent: 5317276 (1994-05-01), Yamamoto
patent: 5317288 (1994-05-01), Yung et al.
patent: 5448196 (1995-09-01), Kanbara et al.
patent: 5543742 (1996-08-01), Takeda et al.
patent: 5568098 (1996-10-01), Horie et al.
patent: 5790942 (1998-08-01), Le Corre et al.
Electronics Letters, May 10, 1984, vol. 20, No. 10., "Unity-Gain Frequency-Independent Quadrature Phase Shifter," FIG. 1, p. 431.

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