Automatic regulating method and circuit for phase locking loop frequency synthesizer switch capacitor

A frequency synthesizer, switched capacitor technology, applied in the direction of automatic power control, electrical components, etc., can solve the problems of prolonging the locking time, increasing the circuit hardware consumption, affecting the quality of system communication, and achieving the effect of good frequency synthesizer performance.

Inactive Publication Date: 2006-11-08
张海清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the following disadvantages: 1) two loops need to be designed, which greatly increases the hardware consumption of the circuit; Transient fluctuations are generated, thereby prolonging the locking time; 3) On...

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  • Automatic regulating method and circuit for phase locking loop frequency synthesizer switch capacitor
  • Automatic regulating method and circuit for phase locking loop frequency synthesizer switch capacitor
  • Automatic regulating method and circuit for phase locking loop frequency synthesizer switch capacitor

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Embodiment Construction

[0018] figure 1 It is a schematic diagram of the structure of the phase-locked loop frequency synthesizer adopting the automatic adjustment of the switched capacitor of the present invention. The present invention is applied in the switch control module 14 . The switched capacitor automatic adjustment frequency synthesizer consists of phase frequency detector (PFD) 10, charge pump and low pass filter (CP&LPF) 11, switched capacitor voltage controlled oscillator (SC VCO) 12, frequency divider ( / N) 13 , and a switch control module (switch control) 14. A common phase-locked loop frequency synthesizer does not have a switch control module 14, and the voltage-controlled oscillator is usually an LC resonant structure, and frequency adjustment is realized by a variable capacitor. In the switched capacitor voltage controlled oscillator 12, frequency adjustment is accomplished by variable capacitors and switched capacitor arrays. Under a certain control voltage Vc, the voltage-cont...

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Abstract

This invention relates to an automatic adjusting method and a realization circuit for the switch of a phase-locking loop frequency synthesizer switch capacitance, which changes the LC resonance structure of the voltage-controlled oscillator in a phase-locking loop frequency synthesizer to a structure of a variable capacitor and switch capacitor array and adds a switch capacitance control module for testing the voltage variance of the voltage-controlled oscillator to control the load of the switch capacitor and regulate the central frequency of the oscillator to get even better performance of synthesizers, said control module is composed of two hysteresis comparators and a FSM for regulating the switch, the input of the comparator is control voltage having high and low threshold voltages, the FSM controls the switch of the switch capacitor array.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, and in particular relates to an automatic adjustment method and a realization circuit of a switching capacitor of a phase-locked loop frequency synthesizer. Background technique [0002] The huge market potential of portable wireless communication products has greatly promoted the development of radio frequency integrated circuit products. Various radio frequency communication protocols have emerged as the times require. They work in the frequency range from several hundred M to several G respectively, and their respective specification requirements are also different. But no matter what kind of standard wireless radio frequency communication products are used, they must use frequency synthesis technology to obtain local oscillator frequency (local oscillator, LO) or direct modulation transmission. A frequency synthesizer (frequencysynthesizer, FS) for this purpose ha...

Claims

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Application Information

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IPC IPC(8): H03L7/099H03L7/08
Inventor 张海清
Owner 张海清
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