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Temperature Compensation Method of Voltage Controlled Oscillator and Voltage Controlled Oscillator
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A technology of voltage-controlled oscillator and temperature compensation, which is applied in the automatic control of power, electrical components, etc.
Active Publication Date: 2018-09-11
北京昂瑞微电子技术股份有限公司
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[0009] The technical problem to be solved by the present invention is to provide a temperature compensation method for a voltage-controlled oscillator and a voltage-controlled oscillator, which can keep the control voltage of the voltage-controlled oscillator near the middle value when the temperature changes, without performance degradation or failure. lock situation
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Embodiment 1
[0073] see image 3 , which is a flow chart of Embodiment 1 of a temperature compensation method for a voltage-controlled oscillator provided by the present invention.
[0074] The temperature compensation method for a voltage-controlled oscillator provided in this embodiment is applied to a voltage-controlled oscillator, and the voltage-controlled oscillator includes: an inductor, a capacitor for adjusting frequency, a varactor, and at least two temperature compensation capacitors; for a phase-locked loop The control word of the adjustment frequency capacitor corresponding to each frequency point used is pre-stored in a lookup table, and the intermediate value of the control word of the temperature compensation capacitor is pre-stored in a lookup table;
[0075] The temperature compensation capacitor is connected in the same way as the adjustment frequency capacitor;
[0076] It can be understood that the number of temperature compensation capacitors can be set according to ...
Embodiment 2
[0085] see Figure 4 , which is a flow chart of Embodiment 2 of the temperature compensation method for a voltage-controlled oscillator provided by the present invention.
[0086] The control word for adjusting the frequency capacitor is pre-stored in a lookup table, specifically including:
[0087]S401: Set the control voltage of the voltage-controlled oscillator to an intermediate value, set the control word of the temperature compensation capacitor to an intermediate value, perform automatic frequency correction on each frequency point used by the phase-locked loop, and find each frequency The control word of the frequency adjustment capacitor corresponding to each frequency point is stored in the look-up table.
[0088] S402: Detect the control voltage of the voltage-controlled oscillator after transmitting or receiving a frame;
[0089] If it is judged that the control voltage exceeds the preset voltage range, update the control word of the temperature compensation capa...
Embodiment 3
[0125] see Figure 8 , which is a schematic diagram of Embodiment 3 of the voltage-controlled oscillator provided by the present invention.
[0126]It should be noted that Embodiment 1 of the voltage-controlled oscillator provides a voltage-controlled oscillator, and this embodiment provides another voltage-controlled oscillator, which will be described in detail below with reference to the accompanying drawings.
[0127] The voltage-controlled oscillator provided in this embodiment, the inductor L, the frequency adjustment capacitor Ctune, the varactor Cvar and at least two temperature compensation capacitors Ctemp; also includes: a voltage detection circuit 801, an AD converter 802, a controller 803 and a memory 804 ;
[0128] It can be understood that the voltage detection circuit 801 is the same as the voltage detection circuit 501 in the first embodiment of the voltage-controlled oscillator.
[0129] The temperature compensation capacitor Ctemp is connected in the same ...
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Abstract
The invention provides a voltage controlled oscillator and a temperature compensation method therefor. The method is applicable to the voltage controlled oscillator. The voltage controlled oscillator comprises an inductor, a frequency adjusting capacitor, a varactor and at least two temperature compensation capacitors. A control word of the frequency adjusting capacitor used by a phase locked loop and corresponding to each frequency point is prestored in a lookup table, and an intermediate value of a control word of the temperature compensation capacitor is presorted in the lookup table; and the connection methods of the temperature compensation capacitors and the frequency adjusting capacitor are the same. The method comprises the steps of after finishing sending or receiving a frame, detecting a control voltage of the voltage controlled oscillator; and judging whether the control voltage is in a preset voltage range or not, if the control voltage exceeds the preset voltage range, upgrading the control word of the temperature compensation capacitor corresponding to the frequency point in the lookup table, so as to adjust the control voltage within the preset voltage range. Through adoption of the voltage controlled oscillator and the temperature compensation method therefor, the condition of phase locked loop (PLL) losing lock caused by performance reduction of the voltage controlled oscillator (VCO) and change of the control voltage corresponding to the frequency point due to environment temperature change is prevented.
Description
technical field [0001] The invention relates to the technical field of electronic control, in particular to a temperature compensation method of a voltage-controlled oscillator and the voltage-controlled oscillator. Background technique [0002] see figure 1 , which is a schematic diagram of a voltage-controlled oscillator in the prior art. [0003] figure 1 The shown Voltage Controlled Oscillator (VCO, Voltage Controlled Oscillator) is an LC type structure, that is, includes an inductor, a frequency adjusting capacitor Ctune and a varactor Cvar. It should be noted that there are multiple ctunes, generally in the form of an array. When the process of the device in the VCO changes, the capacitance displayed by the overall ctune is changed by adjusting the control word of the ctune, thereby adjusting the output frequency. [0004] When the VCO is working, by adjusting the control word of Ctune, the oscillation frequency of the VCO is close to the target frequency and falls...
Claims
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Application Information
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