Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1994-04-21
1995-09-05
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327254, 327563, H03F 345, H03K 522
Patent
active
054481961
ABSTRACT:
A phase shift circuit suitable for use in an FM detecting circuit of quadrature detection method adopted for a FM radio receiver, for example. The phase shift circuit includes first and second pairs of differential transistors to which input signals are applied as differential inputs in common, first and second current sources for driving the first and second pairs of differential transistors, respectively, a first load circuit connected to respective collectors of the first pair of differential transistors, a second load circuit connected to an output side collector of the second pair of differential transistors and a third pair of differential transistors to which a first signal and a second signal are applied as differential inputs, wherein the first signal is derived from one of the collectors of the first pair of differential transistors, whereas the second signal is derived from the output side collector of the second pair of differential transistors. The resistance load circuit may be of Y-connection and .DELTA.-connection. The resonant circuit is composed of a resistor and a ceramic resonator connected in parallel to each other. Since three differential transistor circuits are connected in parallel, it is possible to realize a low-voltage phase shift circuit which can be activated by a single battery (about 0.9 V).
REFERENCES:
patent: 3852624 (1974-12-01), Marik et al.
patent: 4748346 (1988-05-01), Emori
patent: 4795923 (1989-01-01), Dobos
patent: 4866314 (1989-09-01), Traa
patent: 4922127 (1990-05-01), Denny
Kanbara Yoshihiko
Nakai Tsutomu
Callahan Timothy P.
Kabushiki Kaisha Toshiba
Shin Eunja
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