Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Patent
1996-01-23
1996-12-17
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
327100, 327101, 327129, 327407, 332135, 331113R, 331177R, 331179, 341144, H03B 2100, H03K 3282
Patent
active
055857515
ABSTRACT:
A frequency control circuit of an FM modulator with a small number of external parts and a low number of IC pins, including a non-linear D/A converter, a current generator circuit and an emitter-coupled multivibrator. The non-linear D/A converter for giving an analog optimum resistance value depending on digital frequency control signals includes a plurality of resistors weighted by K.sup.n (1<K<2 and n is a sequential natural number). The current generator generates a current .DELTA.I depending on the output resistance value of the non-linear D/A converter. An oscillating frequency of the multivibrator is determined in proportional to I.sub.o /4CF.DELTA.I (I.sub.o represents a current value of an operational current source, C represents a capacitance of a capacitor, R represents a resistance value of a resistor and .DELTA.I represents a current flowing in the resistor). When the oscillating frequency is controlled depending on .DELTA.I, a value of a frequency deviation can be changed almost linearly to readily carry out the control.
REFERENCES:
patent: 2986654 (1961-05-01), Gunning
patent: 3902140 (1975-08-01), Grebene
patent: 3909748 (1975-09-01), Yuan et al.
patent: 4271499 (1981-06-01), Leveque
patent: 4595885 (1986-06-01), Prieto et al.
patent: 4600897 (1986-07-01), Koga et al.
patent: 4670721 (1987-06-01), Gontowski, Jr. et al.
patent: 5126740 (1992-06-01), Kawada
Kato, Kazuo, et. al., "A Low-Power 128-MHz VCO for Monolithic PLL IC's", I.E.E.E. Journal of Solid-State Circuits, vol. 23. No. 2, Apr. 1988, N.Y., pp. 474-479.
IBM Technical Disclosure Bulletin, "Voltage Controlled Oscillator Frequency Switch", vol. 31, No. 5, Oct. 1988, N.Y., p. 235.
Callahan Timothy P.
Le Dinh T.
Sanyo Electric Co., Inc.
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