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Voltage controlled oscillator for reducing gain surge

A voltage-controlled oscillator, digital control technology, applied in power oscillators, electrical components and other directions, can solve the problem of no voltage-controlled oscillator and so on

Active Publication Date: 2005-05-11
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And an effective solution is to reduce the K when designing the VCO VCO fluctuations, but there is currently no voltage-controlled oscillator of this type

Method used

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  • Voltage controlled oscillator for reducing gain surge
  • Voltage controlled oscillator for reducing gain surge
  • Voltage controlled oscillator for reducing gain surge

Examples

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Embodiment Construction

[0021] Such as Figure 5 As shown, the present invention is in figure 2 It is improved on the basis of the medium voltage controlled oscillator circuit. The present invention converts the coupling capacitor C in the LC resonant circuit c Change to the form of switched capacitor array. This group of switched capacitors and the group of switched capacitors that realize the coarse frequency adjustment (that is, C in the figure 2 , C 1 and C 0 ) is controlled synchronously by the chip. A digitally controlled switched capacitor circuit via a digitally controlled bit A 2 A 1 A 0 To turn on or off the switch to determine whether the capacitor is connected to the LC resonant tank. Here, you can choose the amount of capacitance and control the access method according to your needs. When A 2 A 1 A 0 When there are different digital levels, the capacitors in the switched capacitor array will be connected to the LC resonant tank of the oscillator in different combinations, so...

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Abstract

The invention consists of LC resonance loop used in providing negative conductance active device. The capacitor of the above LC resonance loop is a varactor capacitor connected in series with a coupling capacitor, and then connected in parallel with a digital controlled switching capacitor. The above coupling capacitor is also a digital controlled switching capacitor.

Description

technical field [0001] The invention relates to a voltage-controlled oscillator, in particular to a voltage-controlled oscillator with small gain fluctuation. Background technique [0002] In the past ten years, personal wireless communication systems such as pagers, cordless phones, analog and digital cellular phones, 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 technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/12
Inventor 石浩张国艳廖怀林黄如张兴王阳元
Owner PEKING UNIV
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