VOLTAGE-CONTROLLED OSCILLATOR

PROBLEM TO BE SOLVED: To widen the frequency variable width by reducing a frequency fluctuation due to a voltage fluctuation of a positive power supply voltage Vcc, even when a variable capacitor means such as a variable capacitor is connected to the positive power supply and adopting a Vcc connecti...

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Bibliographic Details
Main Authors MURAKAMI NORIO, MIYAZAKI SHIGEYUKI, KONO SHUICHI, SHIMURA JO
Format Patent
LanguageEnglish
Published 16.01.1998
Edition6
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
GENERATION OF NOISE BY SUCH CIRCUITS
GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER
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Summary:PROBLEM TO BE SOLVED: To widen the frequency variable width by reducing a frequency fluctuation due to a voltage fluctuation of a positive power supply voltage Vcc, even when a variable capacitor means such as a variable capacitor is connected to the positive power supply and adopting a Vcc connection structure for the variable capacitor means. SOLUTION: A reference voltage Vr whose voltage is Vcc/2 is applied to a noninverting input terminal of an operational amplifier 15 by using voltage division resistors 12, 13. When an external control voltage Vc is fed to an inverting input terminal of the operational amplifier 15 via a resistor 11, the operational amplifier 15 provides an output of an internal control voltage Vi(=-Vc+Vcc) to variable capacitors 28, 29. An internal control voltage Vc, resulting from subtracting the Vcc from the control voltage Vi, is fed to the variable capacitors 28, 29 to decide the capacitance of the variable capacitors 28, 29. An output voltage Vo with an output frequency (f) is outputted from an output node No, in response to the capacitance.
Bibliography:Application Number: JP19960166361