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VCO

A voltage-controlled oscillator and oscillation circuit technology, applied in the field of phase-locked loops, can solve the problems of increasing the slope of the VCO curve and easy to produce jitter, and achieve the effect of excellent low-frequency performance

Active Publication Date: 2016-08-31
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the linear region, due to the use of resistors R1-R4 to adjust the voltage-controlled oscillator circuit, there are different transconductances, so that the slope of the VCO curve increases in the high-frequency stage, which is prone to jitter

Method used

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Embodiment Construction

[0021] After summing up a lot of practical experience, the inventor proposed a new type of voltage-controlled oscillator, which can provide a VCO curve with clear multiple sub-curves in the low-frequency stage by setting a circuit for supplying the initial current, so that all The above VCO has excellent low frequency performance.

[0022] refer to Figure 5 , an implementation manner of the voltage-controlled oscillator of the present invention may include: a control unit 501, configured to control the input current value according to the control voltage; a current mirroring unit 502, configured to mirror the input current to the input terminal of the oscillation circuit; The oscillating circuit 503 is configured to provide an oscillating frequency related to the control voltage according to the input current; the initial current setting unit 504 is configured to provide a current value of the oscillating circuit in an initial working stage.

[0023] refer to Figure 6 A sp...

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Abstract

A voltage-controlled oscillator, comprising: a control unit, used to control an input current value according to a control voltage; a current mirror unit, used to mirror the input current to an input terminal of an oscillating circuit; an oscillating circuit, used to The input current provides the oscillation frequency related to the control voltage; the initial current setting unit is used to provide the current value of the oscillation circuit in the initial working stage. In the present invention, the initial current setting unit for providing initial current is arranged at different positions of the circuit, so that the voltage-controlled oscillator can provide a VCO curve with clear multiple sub-curves in the low-frequency stage, thereby having excellent low-frequency performance.

Description

technical field [0001] The invention relates to a phase-locked loop technology, in particular to a voltage-controlled oscillator in a phase-locked loop circuit. Background technique [0002] A phase-locked loop (PLL, Phase-Locked Loop) is a commonly used closed-loop circuit, which uses an externally input reference signal to control the frequency and phase of an internal oscillation signal of the loop. During the working process of the phase-locked loop circuit, 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. Currently, refer to figure 1 , The phase locked loop circuit is usually composed of three parts: a phase detector (PD) 101 , a loop filter (LF) 102 and a voltage controlled oscillator (VCO) 103 . [0003] Among them, the voltage-controlled oscillator is a key component in the phase-locked loop circuit, and the VCO curve of the voltage-controlled oscillato...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
Inventor 彭进忠
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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