Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1996-09-26
1998-04-14
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327147, 331 11, 331 17, H03D 1300, H03L 7087
Patent
active
057397090
ABSTRACT:
A phase frequency detecting circuit is designed to produce an output voltage which varies with respect to an input phase difference between a base phase and a reference phase. Herein, a first phase frequency comparator produces a first phase error signal which is proportional to the input phase difference. A first integration circuit performs integration on the first phase error signal to produce a control voltage. Next, a second phase frequency comparator receives a frequency-divided base phase and a frequency-divided reference phase to produce a second phase error signal. A second integration circuit performs integration on the second phase error signal to produce a frequency-divided control voltage. An offset voltage creating circuit creates an offset voltage. Herein, the offset voltage is created based on the frequency-divided control voltage; and a sign thereof is determined responsive to a relationship between the control voltage and frequency-divided control voltage. An offset imparting circuit adds the offset voltage to the frequency-divided control voltage, then, the addition result is amplified to produce the output voltage. Incidentally, an amplifier can be further provided to produce an amplified output voltage based on the frequency-divided control voltage. The amplified output voltage is used instead of the frequency-divided control voltage and is delivered to the offset voltage creating circuit and offset imparting circuit.
REFERENCES:
patent: 3815042 (1974-06-01), Maunsell et al.
patent: 4605908 (1986-08-01), Broughton
patent: 4940952 (1990-07-01), Kegasa
Ando Electric Co. Ltd.
Callahan Timothy P.
Lam T. T.
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