| 摘要 |
PCT No. PCT/GB87/00640 Sec. 371 Date Jul. 8, 1988 Sec. 102(e) Date Jul. 8, 1988 PCT Filed Sep. 14, 1987 PCT Pub. No. WO88/02196 PCT Pub. Date Mar. 24, 1988.A quadrature signal generator is provided which includes a voltage dependent resistance capacitance phase-shifting network (12) and a phase detector (26) for detecting any difference, from 90 DEG , between the phases of the in-phase and quadrature phase signals (2, 24) generated by the network (12) and for producing a control signal in dependence upon such difference. The control signal is applied to the network (12) to vary the phase-shifting characteristic thereof to restore and maintain the 90 DEG phase difference.
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