发明名称 |
AUTOCONFIGURABLE PHASE-LOCKED LOOP WHICH AUTOMATICALLY MAINTAINS A CONSTANT DAMPING FACTOR AND ADJUSTS THE LOOP BANDWIDTH TO A CONSTANT RATIO OF THE REFERENCE FREQUENCY |
摘要 |
A phase-locked loop (PLL) includes a state machine programmed to automatically produce a set of control signals to select a charge-pump current and integrating capacitance value to automatically adjust a loop bandwidth of the PLL. A charge-pump DAC generates a charge-pump current of magnitude controlled by the state machine control signals. An integrator integrates the charge-pump output current to produce an integrated charge-pump output signal. The integrator has a plurality of capacitors switchably selected by control signals from the state machine to produce an integrating capacitance value. A voltage controlled oscillator (VCO) produces a PLL output frequency in response to the integrated charge-pump output signal. |
申请公布号 |
US2012319786(A1) |
申请公布日期 |
2012.12.20 |
申请号 |
US201213525285 |
申请日期 |
2012.06.16 |
申请人 |
KUMAR AJAY;NAGARAJ KRISHNASWAMY;PARK JOONSUNG;TEXAS INSTRUMENTS INCORPORATED |
发明人 |
KUMAR AJAY;NAGARAJ KRISHNASWAMY;PARK JOONSUNG |
分类号 |
H03L7/02 |
主分类号 |
H03L7/02 |
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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