| 摘要 |
An integrated circuit (100) includes an analog phase-locked loop circuit (10) and other circuitry (102). The integrated circuit (100) has a plurality of external connection pins (104, 106), which are coupled to the other circuitry. The analog phase-locked loop circuit (10) is free of connections to the external connection pins. The analog phase-locked loop circuit (10) includes a phase detector circuit (16) which compares the phase of a reference signal (28) to the output (12) of the phase-locked loop circuit, a charge pump circuit (18) responsive to the phase detector for varying the charge on a capacitor (36) of a loop filter circuit (20), a regulator circuit (22) which receives two separate control voltages (38, 44) from the loop filter circuit, and a voltage controlled oscillator circuit (24) which receives from the regulator circuit two separate control voltages (VIN, VREG) and a regulated supply voltage (VREG).
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