发明名称 |
Programmable oscillator circuit and method |
摘要 |
A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.
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申请公布号 |
US6664860(B2) |
申请公布日期 |
2003.12.16 |
申请号 |
US20010754192 |
申请日期 |
2001.01.05 |
申请人 |
FOX ENTERPRISES, INC.;JET CITY ELECTRONICS |
发明人 |
FALLISGAARD JOHN W.;TREFETHAN EUGENE S. |
分类号 |
H03B5/32;H03B1/00;H03B5/36;H03B19/00;H03L7/089;H03L7/18;H03L7/183;(IPC1-7):H03L7/00 |
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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