发明名称 |
Auto-calibration for ring oscillator VCO |
摘要 |
A phase locked loop (“PLL”) includes a voltage controlled oscillator (“VCO”) operable to acquire and maintain lock at a selected output frequency of the VCO and control logic operable to perform steps in a method of selecting a frequency band for operating the VCO. Such method can include switching the VCO to a given operating band from among the plurality of operating bands of the VCO; determining a band center frequency at which the VCO oscillates in the given operating band when the control voltage is set to a center of a range of minimum to maximum control voltages [CVmin, CVmax]; determining a difference between the band center frequency and the selected output frequency when the selected output frequency is within the given operating band; switching the VCO to another operating band; repeating the above steps until a difference between the band center frequency and the selected output frequency increases; and selecting the operating band for operation of the VCO for which the difference between the band center frequency and the selected output frequency is smallest. |
申请公布号 |
US8183950(B2) |
申请公布日期 |
2012.05.22 |
申请号 |
US20090365921 |
申请日期 |
2009.02.05 |
申请人 |
STORASKA DANIEL W.;SORNA MICHAEL A.;INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
STORASKA DANIEL W.;SORNA MICHAEL A. |
分类号 |
H04B1/06 |
主分类号 |
H04B1/06 |
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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