Phase-locked loop circuit of self-bias structure
A self-biasing, phase-locked loop technology, applied in the direction of electrical components, power automatic control, etc., can solve the problems of complex bias voltage or current routing, complex power supply topology, and noise performance changes, so as to simplify the power supply scheme and Frequency planning scheme, simple self-bias structure, and the effect of optimizing noise performance
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[0035] The following description in conjunction with the accompanying drawings of the present invention in further detail.
[0036] like figure 1 Shows a conventional phase-locked loop structure and the typical bias circuit, comprising a phase frequency detector, a charge pump, a loop filter, a voltage controlled oscillator and a frequency divider, a reference bias circuit comprises a bandgap voltage reference and bias home. Can not be seen from FIG work without reference to the case where the voltage or current bias for a conventional charge pump type PLL. In addition, with the increase in clock frequency required in the SOC, the need to support the increased frequency of the crystal, a single phase-locked loop is difficult to support all frequencies, not only led to an increase in the number of phase-locked loop, and change the traditional structure of the phase-locked loop frequency will cause bandwidth of change, which tends to worsen the overall noise phase-locked loop. Incre...
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