发明名称 |
FREQUENCY GENERATOR AND GAIN CALIBRATION TECHNIQUE FOR TWO-POINT MODULATION IN A PHASE-LOCKED LOOP |
摘要 |
A frequency generator includes a phase-locked loop (PLL) and a voltage controlled oscillator (VCO), where the VCO is arranged to receive low-pass data via a first input and high-pass data at a second input. The first input is coupled to a first set of varactors in the VCO. The second input is coupled to a second set of varactors in the VCO. A controller sets the input voltage at the first input and directs a charge pump to operate in a tri-state mode that opens the feedback loop of the PLL. The controller applies different voltages via the second input and measures the change in output frequency. A present gain of the VCO is determined from the ratio of the change in frequency and the change in voltage at the second input and is used to calibrate a portable transceiver.
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申请公布号 |
US2012190311(A1) |
申请公布日期 |
2012.07.26 |
申请号 |
US201213439294 |
申请日期 |
2012.04.04 |
申请人 |
TADJPOUR SHAHRZAD;SKYWORKS SOLUTIONS, INC. |
发明人 |
TADJPOUR SHAHRZAD |
分类号 |
H03L7/08;H04B1/38 |
主分类号 |
H03L7/08 |
代理机构 |
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代理人 |
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地址 |
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