发明名称 |
Process and apparatus for providing an analog waveform synchronized with an input signal |
摘要 |
A waveform generator (20) for generating an analog wave which is synchronized with a signal from an input source (22). The waveform generator (20) includes a phase-locked loop (24) for receiving an input source signal and multiplying said signal by a multiplier. The multiplied square wave signal is then provided to a frequency divider (28) and to a first clock input (39) of a first switched-capacitor filter (29). The frequency divider (28) outputs a divided output signal that is received as an input to the phase-locked loop (25) and by the first switched-capacitor filter (35). As a result, the first switched-capacitor filter (29) outputs a first analog wave of a constant amplitude which is phase synchronized with the input source signal. This waveform generator (20) allows the 3 dB point of the filter to move as the input frequency changes. Further embodiments allow the addition of second switched-capacitor filter (50) and a shift register (45) for providing a second analog wave which is phase shifted from said input source signal yet is synchronized therewith.
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申请公布号 |
US5487027(A) |
申请公布日期 |
1996.01.23 |
申请号 |
US19940245719 |
申请日期 |
1994.05.18 |
申请人 |
LORD CORPORATION |
发明人 |
HEATH, MICHAEL C.;SOUTHWARD, STEVE C. |
分类号 |
H03L7/18;(IPC1-7):G06G7/16;G06J1/00 |
主分类号 |
H03L7/18 |
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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