Quadrature signal generator with spike-less prescalar circuit

Details Quadrature signal generator with spike-less prescalar circuit Quadrature signal generator with spike-less prescalar circuit

1997-05-27

1998-09-15

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

327117, 327239, 327360, G06G 716, H03H 1116

Patent

active

058084991

ABSTRACT:
Self-oscillation of a prescalar circuit is avoided by including offset generators on the inputs of the prescalar circuit. This ensures that when the transistors in one differential pair in the prescalar circuit transition from ON to OFF, the other differential pair of transistors will not transition. As a result, spikes are prevented in the differential pair that does not have a transition. A quadrature signal generator constructed with such a prescalar circuit provides an accurate output despite weak or non-existent input signals.

REFERENCES:
patent: 3624526 (1971-11-01), Silverman
patent: 4754169 (1988-06-01), Morris
patent: 4825109 (1989-04-01), Reynolds
patent: 5444405 (1995-08-01), Truong et al.
patent: 5485110 (1996-01-01), Jones et al.
patent: 5515004 (1996-05-01), Alford et al.
patent: 5517134 (1996-05-01), Yaklin
patent: 5523717 (1996-06-01), Kimura
patent: 5703509 (1997-12-01), Hirata

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