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Temperature compensation type crystal oscillator and communication method thereof

A crystal oscillator and temperature compensation technology, applied in the direction of output stability, electrical components, etc., can solve the problems of expensive custom-made bases, etc., and achieve the effect of improving efficiency and reducing costs

Inactive Publication Date: 2011-07-20
苏州本然微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So this kind of base is very expensive and the order cycle will take a long time

Method used

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  • Temperature compensation type crystal oscillator and communication method thereof
  • Temperature compensation type crystal oscillator and communication method thereof
  • Temperature compensation type crystal oscillator and communication method thereof

Examples

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Embodiment 1

[0021] Embodiment one: if figure 2 As shown, the SCK and AFC terminals are combined to provide a reference clock for DFR (digital frequency reader), and this clock is also used as a communication data line. SI / SO and Q combine to provide data ports for data input and output. The frequency of the TCXO is measured by the DFR in the chip. In this case, the output frequency of the TCXO is not connected to the Q terminal, so it cannot be measured by external devices such as the frequency counter in the temperature calibration system. Such a method requires 6 PIN pin communication methods to realize temperature compensation.

Embodiment 2

[0022] Embodiment two: if image 3 , Figure 4 As shown, there are two PADs, AFC and Q, AFC is used as the clock signal in the communication protocol, and the Q terminal is used as the data signal number in the communication protocol to realize temperature compensation. After the communication is completed, the Q terminal is switched to output, and the required frequency is fixed for output. Both AFC and Q are in the input state when the chip is powered on for the first time. The temperature compensation data is input into the core circuit of the oscillator through the communication protocol, and the feedback signal obtained from the core circuit is calculated by the frequency counter, and the result is obtained from Output from the Q terminal to check whether the result is correct. In this way, after multiple adjustments and comparisons, the final result is locked in the core circuit of the oscillator to achieve the purpose of temperature compensation. After the temperatur...

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Abstract

The invention discloses a temperature compensation type crystal oscillator and a communication method thereof. The invention is characterized in that: an automatic frequency control (AFC) end of a chip is used as a clock signal in a communication protocol, and a Q end is used as a data signal in the communication protocol so as to realize temperature compensation; and after the communication is finished, the Q end is switched to be an output for fixedly outputting a required frequency. In the invention, less than six PIN pins can be used for communication of the temperature compensation type crystal oscillator. Due to the method for realizing communication by only using less than six PIN pins, the base of the PIN pins can be applicable to general bases; therefore, the base is not needed to be customized, the production cost is reduced and the production efficiency is improved.

Description

technical field [0001] The invention relates to a temperature-compensated crystal oscillator, in particular to a temperature-compensated crystal oscillator and a communication method thereof. Background technique [0002] A Temperature Compensated Crystal Oscillator (TCXO) consists of a crystal and a chip. There are a series of controllable capacitors or capacitor diodes and amplifier circuits inside the chip, plus a crystal to form an effective oscillation circuit. The frequency of the oscillator is determined by the resonance frequency of the oscillation circuit. The temperature sensor inside the chip is used to detect the temperature change around the crystal. Based on this temperature, the chip can increase or decrease capacitance through the array of capacitors according to queryable performance criteria stored in its internal tank circuit. Alternatively, the chip could tune the varactors in the tank according to queryable performance criteria stored in its internal t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L1/02
Inventor 张达泉刘斌陈克恭王树一
Owner 苏州本然微电子有限公司
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