发明名称 |
Piezoelectric-oscillator |
摘要 |
Deterioration in frequency stability with time in a conventional piezoelectric oscillator using an accumulation type MOS capacitance element is improved. A P-channel transistor type or an N-channel transistor type is used as a MOS capacitance element in a variable capacitance circuit used in a piezoelectric oscillator. A bias voltage is applied between P-type or N-type extraction electrodes formed in source and drain regions and an N-type extraction electrode provided in an N-well region or a P-type extraction electrode provided in a P-well region. Instability in the MOS capacitance element with time is thus eliminated.
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申请公布号 |
US7439819(B2) |
申请公布日期 |
2008.10.21 |
申请号 |
US20040566287 |
申请日期 |
2004.08.03 |
申请人 |
EPSON TOYOCOM CORPORATION;NEC ELECTRONICS CORPORATION |
发明人 |
OHSHIMA TSUYOSHI;KUROGO SHIGEHISA;ISHIKAWA MASAYUKI;KUROSAWA SUSUMU;FUJIMOTO YUKI;NAKASHIBA YASUTAKA |
分类号 |
H03B5/32;H01L27/08;H03B5/04;H03B5/12;H03B5/36 |
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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