Temperature compensation oscillator and method for manufacturing the same

一种温度补偿、振荡器的技术，应用在功率振荡器、电气元件、阻抗网络等方向，能够解决产生偏差、调整步骤变多调整成本等问题，达到降低成本的效果

Inactive Publication Date: 2008-11-12
CITIZEN WATCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, this adjustment method has the following problem: the oscillation frequency when the IC chip is also mounted in the package and the oscillation operation is performed deviates from the pre-adjusted resonance frequency.
And more adjustment steps will cost additional adjustment costs

Method used

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  • Temperature compensation oscillator and method for manufacturing the same
  • Temperature compensation oscillator and method for manufacturing the same
  • Temperature compensation oscillator and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0055] [the first embodiment: figure 1 ]

[0056] figure 1 It is a block circuit diagram showing the configuration of the first embodiment of the temperature compensation type oscillator of the present invention.

[0057] Should figure 1 The temperature compensated oscillator shown with Figure 15 The prior art shown is also provided with: an oscillating circuit 20, which connects the crystal plate 15, the inverter 21 and the feedback resistor 22 in parallel, and connects its two connection points through DC cutting capacitors (capacitors) Cc, Cd and The voltage variable capacitors 23, 24 as oscillation capacitors are connected to ground (Gnd); the temperature detection circuit 18 detects the temperature state near the crystal plate 15 through a thermistor or the like; The temperature detection signal of the detection circuit 18 is controlled so that the oscillation frequency of the oscillation circuit 20 is kept substantially constant.

[0058] The temperature compens...

no. 2 approach

[0066] [Second embodiment: figure 2 ]

[0067] figure 2 It is a block circuit diagram showing the structure of the second embodiment of the temperature compensation type oscillator of the present invention.

[0068] The structure of the oscillation circuit 20' of the temperature-compensated oscillator of the second embodiment is slightly different from the oscillation circuit 20 of the above-mentioned first embodiment. ) Ce to ground. Then, the source terminal and the drain terminal of the switching element 2 that is the same as the switching element 1 are connected to both terminals of the DC cutting capacitor Ce, and the non-TCXO mode signal inverted by the inverter 5 is applied to the gate terminal. and the signal obtained.

[0069] In the second embodiment, when the non-TCXO mode signal is at a high level, the switching element 1 is in the conducting state (ON), and the switching element 2 is in the non-conducting (OFF) state, so the voltage variable capacitors 23 an...

no. 3 approach

[0081] [the third embodiment: Image 6 ]

[0082] Image 6 It is a circuit diagram showing the structure of the third embodiment of the temperature compensation type oscillator of the present invention.

[0083] The temperature compensated oscillator of this third embodiment will figure 2 In the second embodiment shown, the switching element 1 is connected between the frequency control signal input point a of the oscillation circuit 20' and the ground (Gnd), and the switching element 2 is connected to the common connection of the slave voltage variable capacitors 23 and 24. Between another frequency control signal input point b connected to the terminal through the resistor R3 and the ground, a non-TCXO mode signal is directly applied to its gate terminal. And, the external input frequency control signal (voltage signal) input from the external terminal 3 is applied to the frequency control signal input point b. When the external input frequency control signal is relative...

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PUM

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Abstract

A temperature detection circuit (18) detects temperature around an oscillation circuit (20) equipped with voltage variable capacitors (23, 24). According to its temperature detection signal, a temperature compensation circuit (30) produces a voltage signal as a temperature compensation signal. That voltage signal is supplied to the voltage variable capacitors (23, 24) in order to sustain the oscillation frequency of the oscillation circuit (20) at a substantially constant level. When a switch element (1) is turned on by a non-TCXO signal, both terminals of each voltage variable capacitor (23, 24) are brought to the same potential (ground potential). Consequently, each voltage variable capacitor has a predetermined capacitance and temperature compensation function is made ineffective. In that state, initial frequency regulation is performed under normal temperature.

Description

technical field [0001] The present invention relates to a temperature-compensated oscillator which keeps the frequency of an output signal substantially constant regardless of changes in ambient temperature, and more particularly to a temperature-compensated oscillator and a oscillator which can disable the temperature compensation function. its method of manufacture. Background technique [0002] Temperature-compensated oscillators (TCXOs) are used in various fields, and in recent years are often used in portable mobile communication devices such as mobile phones. This kind of temperature-compensated oscillator generally uses the following crystal oscillator. The crystal oscillator uses an AT cut crystal (oscillator) with a frequency band of 10MHz as an oscillation source to form an oscillation circuit, and a temperature compensation circuit is set for it to eliminate The temperature characteristic of the cubic curve of the AT-cut crystal slice, thereby stabilizing the osc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/32H03H3/04
CPCH03B5/04H03B5/368
Inventor 中村里克古木拓夫增田崇臣
Owner CITIZEN WATCH CO LTD
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