| 摘要 |
A wide dynamic range charge pump is provided for use in a phase-locked loop (PLL) circuit. The charge pump includes a first, second, and third set of current sources. The charge pump further includes a first capacitor having an input connected to the first set. A first operational amplifier (op amp) has an input connected to the first set output, and an output connected to the second set output and to a voltage controlled oscillator (VCO) input. A first resistor has a first end connected to the first op amp output and a second end connected to the third set. A second capacitor has an input connected to the first resistor second end, and an output connected to the second reference voltage.
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