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Voltage control oscillator with low tuning gain variance

A technology of voltage-controlled oscillators and gain changes, applied in power oscillators, automatic power control, electrical components, etc., can solve the problems of low tuning gain changes and large tuning gain changes, and achieve low tuning gain changes and low bandwidth , the effect of increasing power consumption

Inactive Publication Date: 2009-07-15
SHANGHAI RUIXIE MICROELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problem of large tuning gain variation, the present invention proposes a circuit structure of an inductance-capacitance voltage-controlled oscillator with low tuning gain variation

Method used

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  • Voltage control oscillator with low tuning gain variance
  • Voltage control oscillator with low tuning gain variance
  • Voltage control oscillator with low tuning gain variance

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Embodiment Construction

[0028] Further specifically describe the present invention below in conjunction with accompanying drawing:

[0029] figure 2 It is the schematic circuit diagram of the present invention, which is composed of the following components:

[0030] Transistors (Mp1, Mp2, Mn1, Mn2) form a cross-complementary coupled pair of transistors to supplement oscillation losses.

[0031] The inductance L of symmetrical structure is connected in parallel between the resonance points P1 and P2, as the inductance component of the inductance-capacitance oscillation network.

[0032] A variable capacitor C controlled by a differential control voltage (Vctrln, Vctrlp) v , connected in parallel between the resonance points P1 and P2, its equivalent capacitance changes with the change of the differential control voltage.

[0033] Switched capacitor array (Switched capacitor array), the function of this array can be equivalent to a fixed capacitor connected in parallel between the resonance points ...

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Abstract

The present invention discloses an LC voltage-controlled oscillator with low tuning gain variation. The LC voltage-controlled oscillator comprises a parallel inductance-capacitance resonance circuit, two pairs of transistors which are crossly coupled and connected, a pressure controlled variable capacitor, a switch variable capacitor array and a switching capacitor array. The variation range of pressure controlled variable capacitor is adjusted through the switch variable capacitor array for counteracting the effect of oscillation frequency to tuning gain. The invention adjusts the magnitude of variable capacitor switched into the resonant circuit with a digital control signal according to the variation of oscillation frequency, and changes the regulation range of equivalent variable capacitor along with the difference of sub-band thereby counteracting the effect of oscillation frequency change to the tuning gain of voltage controlled oscillator, realizing the design of wideband voltage controlled oscillator with low tuning gain variation, and simultaneously not adding additional power consumption.

Description

technical field [0001] The invention relates to an inductance-capacitance voltage-controlled oscillator circuit with low tuning gain variation, in particular to a voltage-controlled oscillator with low tuning gain variation using a switch variable capacitor array, and belongs to the technical field of radio frequency integrated circuits. Background technique [0002] With the continuous and rapid development of integrated circuit technology, the research of radio frequency (RF) integrated circuits using CMOS technology has received extensive attention. At the same time, the development of wireless communication technology has also promoted the research of low-cost, low-power wireless transceivers. With the development of wireless communication networks, more and more radio frequency circuits require transceivers to cover a wider frequency range. In the past ten years, a large number of technologies on the design of broadband LC voltage-controlled oscillators have emerged. ...

Claims

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Application Information

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IPC IPC(8): H03L7/099H03B5/12
Inventor 袁路卢磊唐长文廖友春
Owner SHANGHAI RUIXIE MICROELECTRONICS TECH
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