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PLL bandwidth control circuit and method

A bandwidth control, phase-locked loop technology, applied in the direction of automatic power control, electrical components, etc., can solve problems such as low accuracy, achieve accurate calibration, improve bandwidth accuracy, and avoid poor calibration accuracy.

Active Publication Date: 2020-09-01
SHANGHAI EASTSOFT MICROELECTRONICS +1
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Problems solved by technology

[0004] However, in the prior art, the accuracy of calibrating the bandwidth of the phase-locked loop is low

Method used

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  • PLL bandwidth control circuit and method

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Embodiment Construction

[0029] In the prior art, when calibrating the bandwidth of the phase-locked loop, usually the K of the VCO unit VCO to calibrate. refer to figure 1 , which gives a K in the prior art VCO Schematic diagram of the function of the control voltage value of the LC VCO (inductance-capacitance VCO) unit, figure 1 Among them, the abscissa is the control voltage value of the VCO unit, the unit is V; the ordinate is K VCO The value of , the unit is MHz / V.

[0030] From figure 1 It can be seen from the figure that for the common inductor-capacitor voltage-controlled oscillator (VCO), with the change of the control voltage value of the VCO unit K VCO It also changes accordingly. When the control voltage of the VCO unit rises from 0V to 0.7V, K VCO The value gradually increases; when the control voltage of the VCO unit gradually rises from 0.9V to 1.5V, K VCO value decreases gradually. When the control voltage of the VCO unit is between 0.1V and 0.7V, K VCO The rate of change wit...

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Abstract

The invention discloses a phase-locked loop bandwidth control circuit and a method. The phase-locked loop comprises a phase frequency detector, a charge pump, a loop filter, a VCO unit, and a frequency divider, wherein the control circuit comprises a controller and a VCO frequency meter; the VCO frequency meter is suitable for sending the detected frequency of a VCO unit output signal to the controller; the controller is suitable for controlling the control voltage of the VCO unit in a preset voltage range, and adjusting the VCO unit output signal frequency of the phase-locked phase in the preset frequency range taking the target frequency as the center frequency; the VCO unit output signal frequency of the phase-locked loop is adjusted by taking the target frequency as the reference frequency; the control voltage of the VCO unit can be acquired after performing adjusting by taking the target frequency as the reference standard, and the parameter of the phase-locked loop is computed and reset according to the adjusted control unit of the VCO unit. The calibration accuracy of the phase-locked loop bandwidth can be improved by use of above mentioned scheme.

Description

technical field [0001] The invention relates to the field of phase-locked loop circuits, in particular to a phase-locked loop bandwidth control circuit and method. Background technique [0002] A phase locked loop (Phase Locked Loop, PLL) is a feedback control circuit, referred to as a phase locked loop, which can control the frequency and phase of an internal oscillation signal of the loop by using an externally input reference signal. During the operation of the phase-locked loop, when the frequency of the output signal is equal to the frequency of the input signal, the output voltage and the input voltage maintain a fixed phase difference, that is, the phase of the output voltage and the input voltage is locked. A phase locked loop usually consists of three parts: a phase detector (Phase Detector, PD), a loop filter (Loop Filter, LF) and a voltage controlled oscillator (Voltage Controlled Oscillator, VCO). [0003] Phase-locked loop frequency synthesizers are widely used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/08H03L7/089H03L7/099H03L7/10
CPCH03L7/0805H03L7/0893H03L7/099H03L7/104
Inventor 刘瑞金陈光胜张旭
Owner SHANGHAI EASTSOFT MICROELECTRONICS
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