发明名称 |
TEMPERATURE COMPENSATING METHOD FOR SAW OSCILLATOR, TEMPERATURE COMPENSATED SAW OSCILLATOR, TRANSMITTER AND RECEIVER USING THE SAME OSCILLATOR |
摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave(SAW) oscillator or the like capable of compensating a temperature in a simple configuration and surely compensating the temperature even when a SAW resonator has variation in temperature characteristics. SOLUTION: The output signal of a temperature sensor 4 is amplified by an amplifier 11 and outputted to a wind comparator 13. A lower/upper limit voltage corresponding to a medium temperature area including a room temperature is set to the wind comparator 13 by a medium temperature area setting circuit 12 and it is discriminated whether or not a voltage corresponding to the detected temperature exceeds the range of a correspondent voltage set by the medium temperature area setting circuit 12. When the voltage exceeds that range, the contact of a switch 14 is opened and the capacitance of a capacitor serially connected to a SAW resonator 1 is decreased so that the oscillation frequency of a SAW oscillator 2 is increased. Therefore, concerning the SAW resonator 1, the temperature is compensated only in the low and high temperature areas which require temperature compensation.
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申请公布号 |
JP2000114873(A) |
申请公布日期 |
2000.04.21 |
申请号 |
JP19980276222 |
申请日期 |
1998.09.29 |
申请人 |
SEIKO EPSON CORP |
发明人 |
ITO NORIO;TAKADA YUTAKA |
分类号 |
H03B5/30;H03H9/02;H03H9/145;H03H9/25;H03L1/02;H04B1/03;(IPC1-7):H03B5/30 |
主分类号 |
H03B5/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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