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Phase-locked loop circuit and calibration method for characteristic curves of voltage-controlled oscillator

A technology of voltage-controlled oscillator and voltage-controlled oscillation, which is applied in the direction of automatic control of electrical components and power, etc., can solve problems such as deterioration of phase-locked loop circuit performance, achieve yield improvement, reduce phase jitter, and improve overall performance Effect

Active Publication Date: 2015-06-10
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention solves the problem that the performance of the phase-locked loop circuit deteriorates due to the deviation between the actual characteristic curve of the voltage-controlled oscillator and its ideal characteristic curve

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  • Phase-locked loop circuit and calibration method for characteristic curves of voltage-controlled oscillator
  • Phase-locked loop circuit and calibration method for characteristic curves of voltage-controlled oscillator
  • Phase-locked loop circuit and calibration method for characteristic curves of voltage-controlled oscillator

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Embodiment Construction

[0041] As described in the background, due to the inevitable process deviation in the production process of the phase-locked loop circuit, the actual characteristic curve of the voltage-controlled oscillator in the phase-locked loop circuit deviates from its ideal characteristic curve, resulting in the Performance deteriorates.

[0042] In order to ensure that the voltage-controlled oscillator has a sufficient controllable frequency variation range, so that the frequency value of the desired output frequency and its corresponding control voltage are located in the middle of the characteristic curve of the voltage-controlled oscillator, in the prior art, the voltage-controlled oscillation is usually increased gain of the device. However, the increase of the gain of the voltage-controlled oscillator will affect the loop performance of the phase-locked loop circuit, and the application of this method is not ideal. The technical solution of the present invention provides a method...

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Abstract

The invention discloses a phase-locked loop circuit and a calibration method for characteristic curves of a voltage-controlled oscillator. The phase-locked loop circuit comprises a phase frequency detector, a charge pump, a loop filter, the voltage-controlled oscillator and a frequency divider, the voltage-controlled oscillator comprises at least two voltage-controlled oscillation units with different characteristic curves, and the phase-locked loop circuit further comprises a frequency comparison unit, a control unit, a reference voltage generating unit and a switch unit. The characteristic curves of the voltage-controlled oscillator can be selected automatically, overall performance of the phase-locked loop circuit is improved, and production yield of the phase-locked loop circuit is increased.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a method for calibrating the characteristic curves of a phase-locked loop circuit and a voltage-controlled oscillator. Background technique [0002] Phase-locked loop (PLL, Phase-locked loops) circuit is a frequency and phase synchronization technology realized by the principle of feedback control. Its function is to keep the output signal of the circuit synchronized with its external reference signal. When the frequency or phase of the reference signal changes, the PLL circuit will detect this change and adjust the frequency or phase of the output signal through its internal feedback system until the two are resynchronized. This characteristic of the phase-locked loop circuit is widely used in the generation of clock signals. [0003] figure 1 It is a schematic diagram of the structure of a common phase-locked loop circuit. refer to figure 1 , the phase locked lo...

Claims

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Application Information

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IPC IPC(8): H03L7/085H03L7/099H03L7/18
Inventor 薛元李力游
Owner SPREADTRUM COMM (SHANGHAI) CO LTD