Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1997-10-31
2000-01-18
Le, Thanh Cong
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 86, 455324, H04B 150
Patent
active
060164220
ABSTRACT:
An RF quadrature signal generator (320, 370) is configured to receive a clock signal that is buffered by input buffer (404) and then coupled to a frequency divider (412) to produce a divided signal. The divided signal is coupled to a phase shift network (420) to generate a pulse train-pair wherein the two pulse trains of the pulse train-pair are in phase quadrature with one another. Limiting amplifiers (432 and 436) limit the amplitude of the pulse train-pair before they are coupled to a phase determining circuit (460) to generate a control signal representative of the relative phase difference between the amplitude limited pulse train-pair. The control signal is filtered and coupled to an op-amp integrator (474) to produce a feedback signal that is coupled to the phase shift network (420) in order to maintain the amplitude limited pulse train-pair in phase quadrature.
REFERENCES:
patent: 5375258 (1994-12-01), Gillig
patent: 5761615 (1998-02-01), Jaffee
patent: 5826180 (1998-10-01), Golan
patent: 5894592 (1999-04-01), Brueske et al.
patent: 5896562 (1999-04-01), Heinonen
L. Bellarbi et al., "Unity Gain Frequency-Independent Quadrature Phase Shifter" Mar. 28, 1984, Electronics Letters, May 10, 1984; vol. 20, No. 10. pp. 431.
Bartusiak Paul J.
Cong Le Thanh
Motorola Inc.
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