发明名称 |
CIRCUITRY AND METHOD FOR PRECISION AMPLITUDE CONTROL IN QUARTZ AND MEMS OSCILLATORS |
摘要 |
An oscillator includes oscillator circuitry (8) including a transconductance stage (2) and a resonator (3). A comparator (10) produces first (CLK) and second (/CLK) clock signals which indicate the timing of positive and negative phases of a differential output signal (VIN+−VIN−) produced by the transconductance circuit in response to the resonator. A synchronous rectifier (14) converts the differential output signal to a current (IRECT) in response to the first and second clock signals. A switched capacitor notch filter (15) filters the current in response to the first and second clock signals. A control current (ICONTROL) which controls the transconductance of the transconductance circuit is generated in response to the notch filter. The resonator may be a MEMS resonator. |
申请公布号 |
US2012206210(A1) |
申请公布日期 |
2012.08.16 |
申请号 |
US20110931940 |
申请日期 |
2011.02.15 |
申请人 |
IVANOV VADIM V.;SHAY MICHAEL J.;TEXAS INSTRUMENTS INCORPORATED |
发明人 |
IVANOV VADIM V.;SHAY MICHAEL J. |
分类号 |
H03B5/02 |
主分类号 |
H03B5/02 |
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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