发明名称 |
Precision CMOS oscillator circuit |
摘要 |
A CMOS relaxation oscillator is disclosed employing a pair of capacitors and individual charging means. A noninverting amplifier comprising two cascaded inverters is provided with a transmission gate input circuit that alternately switches the amplifier input between the two capacitors. A pair of switches coupled respectively across the capacitors alternately discharge them. The resulting oscillator has a frequency determined by the capacitor charging periods. Accordingly, the frequency and duty cycle can be predetermined as desired. The circuit can also be made either power supply tunable or power supply independent.
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申请公布号 |
US4904960(A) |
申请公布日期 |
1990.02.27 |
申请号 |
US19890335614 |
申请日期 |
1989.04.10 |
申请人 |
NATIONAL SEMICONDUCTOR CORPORATION |
发明人 |
IZADINIA, MANSOUR;SZEPESI, TAMAS |
分类号 |
H03K3/03;H03K3/354;H03K4/502 |
主分类号 |
H03K3/03 |
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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