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Low Power Low Phase Noise LC Voltage Controlled Oscillator

A technology of voltage-controlled oscillator and low phase noise, applied in the direction of automatic power control, electrical components, etc., to achieve the effect of reducing power consumption, power consumption, and phase noise

Active Publication Date: 2017-01-04
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is how to reduce the power consumption and phase noise of the LC-VCO without changing the power supply voltage.

Method used

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  • Low Power Low Phase Noise LC Voltage Controlled Oscillator
  • Low Power Low Phase Noise LC Voltage Controlled Oscillator
  • Low Power Low Phase Noise LC Voltage Controlled Oscillator

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Embodiment Construction

[0025] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0026] In terms of reducing circuit power consumption, the inductor-capacitor voltage-controlled oscillator of the present invention adopts 3 bits to control the switch, and simultaneously controls the fixed capacitor array and the NMOS cross-coupling negative resistance with a tail current source. Such as figure 1 As shown, the highest frequency of the circuit is obtained when the switches SW1, SW2, and SW3 are all at low level. At this time, the fixed capacitors C3, C4, C7, C8, C11, and C12 are not connected to the oscillation unit, so the LC Tank at this time The total capacitance value is the smallest, so the oscillation frequency is the highest. At this time, because the switches SW1, SW2 a...

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Abstract

The invention discloses a low-power-consumption low-phase noise inductance capacitance voltage-controlled oscillator. NMOS cross coupling negative resistance units connected in parallel and controlled by switches are adopted for the inductance capacitance voltage-controlled oscillator. A capacitor array is controlled by the switches at the same time, so that under the different gating conditions of the capacitor array, an appropriate cross coupling negative resistor is connected to a circuit to provide oscillation energy in a gating mode, and it is not required that maximum oscillation energy is continuously provided under the different gating conditions of the capacitor array. Thus, power consumption of the circuit can be reduced. In addition, variable capacitors with different bias voltages are adopted for the voltage-controlled oscillator and combined in parallel, the capacitance-voltage linearity of the variable capacitors is increased, and phase noise caused by the variable capacitors is reduced.

Description

technical field [0001] The invention relates to the technical field of an inductor-capacitor voltage-controlled oscillator, and more specifically relates to an inductor-capacitor voltage-controlled oscillator (LC-VCO) with low power consumption and low phase noise. Background technique [0002] As a clock generation unit, the inductor-capacitor voltage-controlled oscillator (LC-VCO) is widely used in circuits that need to provide a certain frequency signal, such as phase-locked loops, modulation and demodulation modules, etc. Compared with the traditional ring oscillator, the power consumption of the LC-VCO is significantly larger, and with the increase of the oscillation frequency, the power consumption tends to increase continuously. In addition, in LC-VCO, as the frequency increases, the requirements for phase noise are getting higher and higher. The variable capacitance of the passive device is a larger noise source, which is caused by the insufficient linearity of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
Inventor 王源甘善良贾嵩张钢刚张兴
Owner PEKING UNIV