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Equipment for implementing frequency coarse regulation of radio-frequency voltage-controlled oscillator

A voltage-controlled oscillator and frequency technology, applied in the direction of power oscillators, electrical components, etc., can solve the problems of increasing the design difficulty, high cost, and deterioration of phase noise of RF voltage-controlled oscillators

Inactive Publication Date: 2005-04-06
PEKING UNIV
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AI Technical Summary

Problems solved by technology

[0006] But the above structure uses C 2 、C 1 and C 0 Three fixed capacitors and corresponding circuits, these capacitors occupy a large area in the layout of the integrated circuit, resulting in relatively high cost, and may cause phase noise deterioration
These have increased the design difficulty of the RF voltage-controlled oscillator

Method used

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  • Equipment for implementing frequency coarse regulation of radio-frequency voltage-controlled oscillator
  • Equipment for implementing frequency coarse regulation of radio-frequency voltage-controlled oscillator
  • Equipment for implementing frequency coarse regulation of radio-frequency voltage-controlled oscillator

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Embodiment Construction

[0021] The schematic diagram of the three-terminal varactor of the present invention is as Figure 5 shown, where V 1 is the first control terminal, V 2 as the second control terminal. can be changed by changing V 1 or V 2 The voltage value of the terminal can cause the change of the capacitance value of the varactor, so the total capacitance value C is V 1 and V 2 function, that is, C=C(V 1 , V 2 ).

[0022] Such as Figure 6 As shown, the present invention is implemented in a typical VCO circuit (such as figure 1 It is improved on the basis of shown). The conventional varactor in the LC resonant circuit can be replaced with a three-terminal varactor. The two control terminals of the three-terminal varactor are respectively connected to different control circuits.

[0023] Such as Figure 7 Shown is the C-V characteristic curve (simulation result of ISE software) of the three-terminal varactor adopted in the present invention. The abscissa is the control voltage...

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Abstract

This invention discloses a device to realize radio frequency press oscillator rough adjusting, which comprises LC resonance circuit and active device to provide negative conductance, wherein, the said LC resonance circuit capacitor is three-end transfiguration tube with its two ends connected with different control circuit. The invention only uses single three-end transfiguration tube to spare the extra fixed capacitors.

Description

technical field [0001] The invention relates to a device for realizing coarse frequency adjustment of a radio frequency voltage-controlled oscillator. Background technique [0002] In the past ten years, personal wireless communication systems such as pagers, cordless phones, analog and digital cellular phones, as well as digital TV and broadcasting have developed rapidly, and wireless communication has become the most important industry after the PC industry. Due to the characteristics of small size, low power consumption and low cost of integrated circuits, the vigorous development of wireless communication technology has contributed to the rapid development of radio frequency integrated circuits. At present, radio frequency integrated circuits have become one of the important research fields of microelectronics. Designing and researching high-performance key circuit modules has become a vital driving force for the advancement of radio frequency integrated circuit technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B7/02
Inventor 石浩张国艳廖怀林延涛王凝华黄如张兴王阳元
Owner PEKING UNIV
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