发明名称 |
Oscillator circuit and oscillator |
摘要 |
The present invention relates to a crystal oscillator circuit in which the output level is maintained to prevent changes in oscillation frequency due to variations in power voltage. This crystal oscillator circuit comprises a resonance circuit formed of a crystal oscillator (which acts as an inductor component) and dividing capacitors, an oscillation amplifier formed of ECL circuitry driven by a power voltage connected to the resonance circuit, and a pull-down resistor between an output terminal of the ECL circuit and ground. The pull-down resistor acts as serially-connected dividing resistors and also a bias capacitor is provided between a connection point between those dividing resistors and ground. The present invention also relates to a frequency-switching oscillator having a simple circuit design and a small number of components. This frequency-switching oscillator enables a configuration in which an oscillation amplifier that is a two input, two output type of ECL circuit having mutually inverted signals is connected to a resonance circuit formed of a crystal oscillator and dividing capacitors; a first resonance circuit provided with a first electronic switch is connected between one pair of input-output terminals for mutually inverted signals of the ECL circuit; a second resonance circuit is connected between another pair of input-output terminals for mutually inverted signals of the ECL circuit; and the resonance frequencies of the first and second resonance circuits are different and also the first and second electronic switches are switched to select one of the resonance circuits.
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申请公布号 |
US7075381(B2) |
申请公布日期 |
2006.07.11 |
申请号 |
US20040824578 |
申请日期 |
2004.04.14 |
申请人 |
NIHON DEMPA KOGYO CO., LTD. |
发明人 |
HASHIMOTO HIDEO |
分类号 |
H03B5/32;H03B5/12;H03B5/30;H03B5/36;H03L1/00 |
主分类号 |
H03B5/32 |
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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