High-frequency piezoelectric oscillator
AssigneeToyo Communication Equipment Co., Ltd.
InventorTomio Satoh
Life of this patent
Estimating the term…
Abstract
In the high-frequency piezoelectric oscillator, capacitors C1, C2 as a part of a load capacitor are connected between a base of a transistor TR1 and the ground. The connection point of the capacitors C1, C2 is connected to an emitter of the transistor TR1, and is grounded via an emitter resistor R1. A base bias circuit consisting of resistors RB1 and RB2 is connected to the base of the transistor TR1. A piezoelectric vibrator, an inductor, and a resistor are connected in parallel, and connected between the base of the transistor TR1. A capacitor is connected to the parallel circuit and grounded. A collector of the transistor and a power supply line are connected together.
Claims6
A high-frequency piezoelectric oscillator including a piezoelectric vibrator having a piezoelectric element that is excited in a predetermined frequency, and an oscillation amplifier that oscillates the piezoelectric element by flowing current to the piezoelectric element, wherein
- an inductor and a resistor are insertion connected in parallel respectively to the piezoelectric vibrator of the high-frequency piezoelectric oscillator, and resonance frequency of a parallel resonance circuit consisting of the inductor and the resistor is set to the vicinity of the oscillation frequency of the high-frequency piezoelectric oscillator thereby to increase negative resistance applied to a series arm of the piezoelectric element and suppress unwanted oscillation due to the inductor.
A high-frequency piezoelectric oscillator including a piezoelectric oscillator having a piezoelectric vibrator that is excited in a predetermined frequency, and an oscillation amplifier that oscillates the piezoelectric vibrator by flowing current to a piezoelectric element, wherein
- a circuit having an inductor and a variable capacitance diode connected in series and a resistor are insertion connected in parallel respectively to the piezoelectric vibrator of the high-frequency piezoelectric oscillator, resonance frequency of a parallel resonance circuit consisting of the inductor and the resistor is set to the vicinity of the oscillation frequency of the high-frequency piezoelectric oscillator, thereby to increase negative resistance applied to a series arm of the piezoelectric element and externally fine adjust the capacitance of the variable capacitance diode so as to optimize oscillation and make it possible to control frequency.
A high-frequency piezoelectric oscillator including a piezoelectric oscillator having a piezoelectric vibrator that is excited in a predetermined frequency, and an oscillation amplifier that oscillates the piezoelectric vibrator by flowing current to a piezoelectric element, wherein
- a first inductor and a resistor are connected in parallel respectively to the piezoelectric vibrator of the high-frequency piezoelectric oscillator, the connection point is grounded via a circuit having a second inductor and a variable capacitance diode connected in series, and resonance frequency of a parallel resonance circuit consisting of the first inductor and the resistor is set to the vicinity of the resonance frequency of the high-frequency piezoelectric oscillator, thereby to increase negative resistance applied to a series arm of the piezoelectric element and externally fine adjust the capacitance of the variable capacitance diode so as to optimize oscillation and make it possible to control frequency.
Dependencies are inferred from the claim text.