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Oscillator

A technology of oscillators and oscillators, applied in power oscillators, electrical components, etc., can solve the problem of insufficient removal of frequency signal noise components, and achieve the effects of reducing phase noise, suppressing waveform clutter, and reducing phase noise.

Inactive Publication Date: 2012-05-09
NIHON DEMPA KOGYO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the latter crystal resonator is not a resonator for shaping sine waves, and the removal of noise components contained in frequency signals is not sufficient

Method used

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no. 1 approach

[0048] figure 1 It is a circuit diagram showing the first embodiment of the oscillator of the present invention. figure 1 The circuit of is constituted as a Colpitts oscillator circuit, and 1 is a crystal oscillator for oscillation. One end of the crystal resonator 1 is connected to the base of an NPN transistor 3 as an amplifier via a frequency adjustment capacitor 21 and an extension coil 22 . The transistor 3 is used to amplify the frequency signal oscillated by the crystal oscillator 1 and feed it back to the crystal oscillator 1 . A series circuit of voltage dividing capacitors 23 and 24 is provided between the base of the transistor 3 and the ground, and the intermediate point of these capacitors 23 and 24 is connected to the emitter of the transistor 3 .

[0049] In addition, a DC voltage of +Vcc is applied to the series circuit of leakage resistors 31 and 32 via DC power supply unit Vcc, and the voltage at the middle point of leakage resistors 31 and 32 is supplied t...

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Abstract

An oscillator outputs a sine wave with high purity capable of reducing phase noise. In a Colpitts oscillator circuit using a transistor (3) as an amplifying part, a quartz-crystal resonator (5) for waveform shaping is provided outside or inside an oscillation loop. A quartz-crystal resonator (1) for oscillation and the quartz-crystal resonator (5) for waveform shaping are formed, with an electrode pair (11, 12) and an electrode pair (51, 52) being provided on a common quartz-crystal piece (10). A separation distance between the electrode (11, (12)) of the quartz-crystal resonator (1) and the electrode (51, (52)) of the quartz-crystal resonator (5) is set large so that they are not elastically coupled, or even when they are elastically coupled, their coupling degree is weak, and an inductor causing parallel resonance with a parallel capacitance of the quartz-crystal resonator (5) is provided. And the quartz-crystal resonator (1) for oscillation and the quartz-crystal resonator (5) for waveform shaping can be replaced by an SAW harmonic oscillator using the same piezoelectric sheet construction.

Description

technical field [0001] The present invention relates to an oscillator. Background technique [0002] A crystal oscillator oscillates by connecting an amplifier to a resonant circuit including a crystal oscillator, and the voltage waveform corresponding to the vibration waveform of the crystal oscillator is a sine wave. However, when the sine wave output from the crystal resonator passes through a circuit such as an amplifier, the waveform becomes distorted. [0003] On the one hand, the frequency stabilization requirements of signals represented by GPS are increasing year by year. Recently, if SSB phase noise is indicated, there are many requirements for the so-called floor level (floor level) below -160dBc with an offset frequency above 10kHz. . On the other hand, noise reduction is also required in the region where the mistuning frequency is 1kHz or less, and achieving these requirements has become a problem. Since the quality of the phase noise is related to the purity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04H03B5/32
CPCH03B5/326H03B2200/0008
Inventor 小山光明
Owner NIHON DEMPA KOGYO CO LTD
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