| 发明名称 |
Voltage controlled oscillator runaway prevention |
| 摘要 |
A feedback module for preventing voltage controlled oscillator (VCO) runaway in a phase locked loop (PLL) circuit can include a first, a second, and a third input to receive a first output signal from a PLL circuit, a reference signal, and a first control signal. The feedback module may also include a feedback circuit to generate a second control signal, the second control signal being coupled to an input of the PLL circuit, wherein the feedback circuit generates the second control signal by comparing a number of cycles of the first output signal to a first threshold, and a number of cycles of the reference signal to a second threshold. |
| 申请公布号 |
US9571109(B2) |
申请公布日期 |
2017.02.14 |
| 申请号 |
US201514671259 |
申请日期 |
2015.03.27 |
| 申请人 |
International Business Machines Corporation |
发明人 |
Friend David M.;Strom James D.;Wagstaff Alan P. |
| 分类号 |
H03L7/06;H03L7/085;H03L7/099;H03L3/00;H03B5/06;H03L7/18;H03L7/22;H03L7/14;H03L7/10 |
主分类号 |
H03L7/06 |
| 代理机构 |
|
代理人 |
Edwards Mark G. |
| 主权项 |
1. A feedback module for preventing voltage controlled oscillator (VCO) runaway in a phase locked loop (PLL) circuit, comprising:
first, second, and third inputs to receive a first output signal from a PLL circuit, and a reference signal and a first control signal; and a feedback circuit to generate a second control signal, the second control signal being coupled to an input of the PLL circuit,
wherein the feedback circuit generates the second control signal by comparing a number of cycles of the first output signal to a first threshold, and a number of cycles of the reference signal to a second threshold. |
| 地址 |
Armonk NY US |
