Voltage controlled oscillator and electronic component

Abstract

To provide a voltage controlled oscillator having small size and capable of obtaining a low phase noise characteristic over a large span of adjustable range of frequency. A quartz crystal having a characteristic (dielectric loss tangent: tan [delta]) better than that of fluorocarbon resin, LTCC or the like conventionally used as a substrate of a resonance part 1, and on which a fine pattern of metal film can be formed through a photolithography method, is used as a quartz-crystal substrate 10, and a conductive line is formed on the quartz-crystal substrate 10 to form an inductance element 11 in the resonance part 1. Accordingly, since the resonance part 1 having a high Q value can be formed, it is possible to obtain a voltage controlled oscillator having small size and low loss over a wide frequency band.

Description

technical field [0001] The present invention relates to a technique for configuring a resonance section using an inductance element and a variable capacitance element, and a voltage control oscillator (VCO: Voltage Control Oscillator) and electronic components using the resonance section. Background technique [0002] Voltage Control Oscillator (VCO: Voltage Control Oscillator) such as Figure 19 As shown, it is equipped with: a resonant part 11 including a variable capacitance diode VD (varicap diode) and an inductance element whose capacitance changes according to a control voltage; a transistor 21 as an amplifier part; and a circuit board including two capacitors C1 and C2. Feedback Section 2. In this example, the frequency signal is amplified by the transistor 21 by the resonant part 11, and fed back to the series resonant circuit via the feedback part 2, thereby constituting an oscillation loop. in addition, Figure 19 31 denotes a buffer amplifier for amplifying a fre...

AI Technical Summary

Problems solved by technology

However, in the case of (a), the phase noise increases due to the use of a doubling (doubling) circuit

In addition, in the case of (b), the phase noise in the vicinity deteriorates, and in the case of (c), it is difficult to miniaturize

[0006] In Patent Document 1, devices such as the above-mentioned VCO are described, but there is no research on the above-mentioned problems

In addition, Patent Document 2 describes a technique for generating elastic waves using quartz (crystal) as a piezoelectric substrate and using it as an oscillator with an oscillation frequency in the several MHz band, for example, but it cannot solve the above-mentioned problems.

Images