发明名称 |
Numerically controlled variable oscillator |
摘要 |
An oscillator includes a resonator, such as a crystal (12) coupled to first and second capacitor banks (14). The first and second capacitor banks (14) each comprise a plurality of capacitors (16) coupled to the resonator (12) through respective switching devices (18) that may be selectively enabled. The switches (18) are selectively enabled to couple a desired set of said capacitors (16) to said resonator (12). At least one of the switches (18sd) is controlled with a clock signal having a programmable duty cycle from a sigma-delta modulator (20) to enable at least one of said capacitors (16sd) during a first phase of the clock signal and disable that capacitor (16sd) during a second phase of the clock signal.
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申请公布号 |
US6400231(B1) |
申请公布日期 |
2002.06.04 |
申请号 |
US20000642481 |
申请日期 |
2000.08.18 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
LEDUC YVES;GUIGNON PASCAL;CARBOU PIERRE |
分类号 |
H03B5/32;H03B5/12;H03B5/36;H03K3/03;(IPC1-7):H03B5/00 |
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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