Gain linearization method based on synchronous compensation of voltage controlled oscillator
A voltage-controlled oscillator and synchronous compensation technology, applied in the field of varactors, to achieve the effect of avoiding instability, avoiding changes, and reliable circuits
Inactive Publication Date: 2008-05-07
SHANGHAI CHIPRF MICROELECTRONICS CO LTD
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[0004] The purpose of the present invention is to design a voltage-controlled oscillator (voltage-controlled oscillator VCO) gain linearization method based on synchronous compensation, to solve the gain variation problem during VCO frequency adjustment, improve the stability of the phase-locked loop system
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[0014] As shown in Figure 4: the negative poles of the two varactor diodes are connected to each other at the node N3, and several channel capacitors C are connected in parallel between the positive poles N7 and N8 of each varactor diode and the negative pole N3 tune , at each channel capacitance C tune The electronic switch B is connected in series; the anode N7 and N8 of each varactor diode are respectively connected to zero potential through a resistor R; the anode N7 and N8 of each varactor diode are respectively connected to ac Connect to nodes N1 and N2, connect inductance L and negative resistance -R in parallel between nodes N1 and N2 eq ;
[0015] Several groups of switched capacitors are connected in parallel between the nodes N1 and N2, and each group of switched capacitors includes two serially connected switched capacitors C switch and an electronic switch A;
[0016] Between the nodes N1 and N2, two stray capacitors C connected in series are also connected in ...
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The invention relates to a varactor in a voltage-controlled oscillator, in particular to a gain linearization method for a voltage-controlled oscillator (VCO) based on synchronous compensation. According to the technical scheme provided by the present invention, the negative poles of the two varactor diodes are connected to the node N3, and several channel capacitors Ctune are connected in parallel between the positive poles N7, N8 and the negative pole N3 of each varactor diode. The electronic switch B is connected in series on the capacitor Ctune; the anodes N7 and N8 of each varactor diode are respectively connected to zero potential through a resistor R; the anodes N7 and N8 of each varactor diode are also connected to the nodes N1 and N8 respectively through the capacitor Cac N2, the inductance L and the negative resistance -Req are connected in parallel between the nodes N1 and N2. After the invention is used, the problem of gain variation during VCO frequency adjustment can be solved, and the stability of the phase-locked loop system can be improved.
Description
technical field [0001] The invention relates to a varactor in a voltage-controlled oscillator, in particular to a gain linearization method for a voltage-controlled oscillator (VCO) based on synchronous compensation. Background technique [0002] There are usually three types of varactors in voltage-controlled oscillators, reverse-biased PN junction type, inverse MOS capacitor (IMOS) and cumulative MOS capacitor (AMOS). The PN junction type varactor has better linearity and higher It is widely used because of its Q value, and the research object of this paper is also a PN junction varactor. [0003] In the gain adjustment process of the voltage-controlled oscillator, the significant fluctuation of the gain is another problem of the wide-band VCO. The reason is that the relative change of the total capacitance caused by the varactor is different in each frequency band. The impact is: 1. There is It may lead to the instability of the phase-locked loop; 2. The phase noise of t...
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IPC IPC(8): H03L7/099H03B5/08
Inventor 杨丰林
Owner SHANGHAI CHIPRF MICROELECTRONICS CO LTD