Oscillators – With frequency adjusting means – Step-frequency change
Patent
1998-03-23
1999-12-28
Mis, David
Oscillators
With frequency adjusting means
Step-frequency change
331 36C, 331117R, 331117D, 331177V, H03B 512, H03B 518
Patent
active
060087021
ABSTRACT:
A Colpitts-type voltage-controlled oscillator includes a transistor having a collector which is connected to a power terminal through a stripline. A capacitor is connected between the collector and the emitter thereof. A diode is connected to the capacitor and an inductor is connected to a point between the capacitor and diode. Another capacitor is connected between the base and the emitter of the transistor. An inductive reactance is formed by a stripline which is connected between the base of the transistor and the ground, two capacitors for DC blocking, and a variable-capacitance diode. Bypass capacitors are connected between the collector of the transistor and the ground. A resistor is connected between the emitter of the transistor and the ground. Two other resistors are provided for dividing a power voltage at the power terminal and for supplying a base voltage to the transistor. Turning the diode on and off allows the oscillating frequency of the voltage-controlled oscillator to vary by a large amount.
REFERENCES:
patent: 4593257 (1986-06-01), Wignot
patent: 4598423 (1986-07-01), Hettiger
patent: 5187451 (1993-02-01), Nakamoto et al.
Patent Abstracts of Japan, vol. 006, No. 170, E-128, Sep. 3, 1982, JP 57-087207.
Patent Abstracts of Japan, vol. 014, No. 051, E-0881, Jan. 30, 1990, JP 01-276904.
Patent Abstracts of Japan, vol. 010, No. 079, E-391, Mar. 28, 1986, JP 60-224308.
Mis David
Murata Manufacturing Co. Ltd.
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