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US 5,739,729 AGranted
Voltage-controlled LC oscillator
OwnerNikolay Tchamov, Petri Jarskeinventors
Life of this patent
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Abstract
In a voltage-controlled LC oscillator, a series LC resonance circuit is connected between two transistor amplifying stages which provide low impedance input and output circuits for the LC circuit. The collector of the first transistor stage is connected through a coil to the operating voltage. The emitter of the second transistor stage is connected to the reference voltage through a coil. This will result in narrowband transistor stages and significant advantages in the power consumption and other characteristics of the oscillator.
Claims8
A voltage-controlled LC oscillator comprising
- a first low impedance transistor stage comprising a first and second main electrode, and a control electrode,
- a second low impedance transistor stage comprising a first and second main electrode, and a control electrode,
- an LC circuit comprising a first inductance and a serial connection of at least one reverse-biased PN semiconductor junction, the serial connection being operationally connected between the first main electrode of the first transistor stage and the corresponding first main electrode of the second transistor stage in such a manner that a control voltage of the oscillator applied to the control electrode of the first transistor stage adjusts reverse-biasing of said at least one PN junction and thereby the capacitance of said at least one PN junction and the resonance frequency of the oscillator;
- a second inductance which connects the second main electrode of the first transistor stage to a first operating voltage so that the DC potential at the second main electrode is essentially equal to the first operating voltage;
- a third inductance which connects the first main electrode of the second transistor stage to a second operating voltage so that the DC potential at the first main electrode is essentially equal to the second operating voltage.
2 more elements
Dependencies are inferred from the claim text.