Constant temperature crystal oscillator

Abstract

The invention provides a constant-temperature crystal oscillator, which belongs to the technical field of oscillators and comprises an oscillating circuit and a resonator arranged on a PCB, the resonator comprises a base and a tube cap, the base is mounted on the PCB and used for being connected with the oscillating circuit, and the tube cap covers the base to form a vacuum heat insulation cavity.A heat insulation bridge, a ceramic substrate, a reed and a quartz wafer are sequentially connected in the vacuum heat insulation cavity from bottom to top, a heating assembly is arranged on the ceramic substrate, and an anti-radiation cover is further arranged above the quartz wafer. According to the constant-temperature crystal oscillator provided by the invention, the ceramic substrate, the reed and the quartz wafer are arranged in the vacuum heat insulation cavity, so that the heat loss of the heating assembly is reduced, and low power consumption is realized; most of heat of the heatingassembly is conducted to the quartz wafer, the heat insulation bridge can also lose heat, and quick starting of the quartz wafer can be achieved; the anti-radiation cover reduces the radiation heat transfer of the quartz wafer and improves the temperature stability of the quartz wafer. The quartz wafer is arranged in the resonator for direct heating, so that the volume is reduced.

Description

technical field [0001] The invention belongs to the technical field of oscillators, and more specifically relates to a constant temperature crystal oscillator. Background technique [0002] Oven crystal oscillators have high frequency stability and low phase noise, and are widely used in communication systems. The existing constant temperature crystal oscillator needs to place the crystal resonator in a specific constant temperature tank, and the constant temperature of the constant temperature crystal resonator is realized by controlling the temperature of the constant temperature tank to keep constant. Due to the relatively large volume of the constant temperature bath, the volume to be heated is also large, so the steady state power consumption of the constant temperature crystal oscillator is relatively large, and the start-up time is also relatively long. Contents of the invention [0003] The object of the present invention is to provide a constant temperature cryst...

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Problems solved by technology

[0003] The object of the present invention is to provide a constant temperature crystal oscillator, aiming to solve the problems of the existing constant temperature crystal oscillator, such as large volume, large steady-state power consumption and long start-up time

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