Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1997-10-07
1999-09-07
Wells, Kenneth B.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327254, 327255, H03K 300
Patent
active
059492678
ABSTRACT:
The invention relates to a circuit arrangement for generating two signals having a phase difference of approximately 90 degrees. The invention is preferably applied in the demodulator of a radio receiver. In order to shift the phase of a signal one idea of the invention is to use a distributed resistance/capacitance circuit or a distributed RC circuit (Z.sub.10, Z.sub.20) in connection with a signal amplifying means (A.sub.1, A.sub.2). The operation of the circuit is not frequency dependent and a circuit adjustment is not necessarily required in order to calibrate the phase difference, because the distributed RC circuit can provide an substantially constant phase shift of .+-.45 degrees over a wide frequency range. The whole circuit can be integrated into one component, because a distributed RC circuit is easily made on the same integrated circuit substrate as the amplifying means, and thus the circuits can be made into a small size and at low manufacturing costs.
REFERENCES:
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patent: 5491832 (1996-02-01), Malkamaki et al.
patent: 5644260 (1997-07-01), DaSilva et al.
"Televiestintajarjestelmat (Telecommunication Systems)", 1992, Seppo J. Halme, pp. 147-244.
Nguyen Hai L.
Nokia Mobile Phones Limited
Wells Kenneth B.
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