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A low phase noise lc-vco

A LC-VCO, low phase noise technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem of reducing LC-VCO

Active Publication Date: 2016-09-07
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to reduce the phase noise of LC-VCO without changing the power supply voltage

Method used

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  • A low phase noise lc-vco
  • A low phase noise lc-vco
  • A low phase noise lc-vco

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0024] figure 2 It is a circuit diagram of a low phase noise LC-VCO of a preferred embodiment of the present invention; the low phase noise LC-VCO includes PMOS transistors Mp1, Mp2, Mp3, Mp4; NMOS transistors Mn1, Mn2; fixed capacitance C1, C2, Cc1, Cc2; Variable capacitors Cvar1, Cvar2; Inductance ind at both ends; Resistors R1, R2;

[0025] The anodes of the variable capacitors Cvar1 and Cvar2 are connected to the capacitance adjustment voltage Vtune, the fixed capacitor C1 is connected between the cathode of the Cvar1 and the output node VCOP; the fixed capacitor C2 is connected between the cathode of the Cvar2 and the output node Between the nodes VCON; the inductance ind at both ends is connected bet...

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Abstract

The invention discloses a low phase noise LC-VCO, the low phase noise LC-VCO comprises PMOS transistors Mp1, Mp2, Mp3, Mp4; NMOS transistors Mn1, Mn2; fixed capacitors C1, C2, Cc1, Cc2; Variable capacitors Cvar1, Cvar2; both ends of the inductance ind; resistors R1, R2. The present invention couples the oscillating voltage waveform to the gate of the PMOS transistor of the parallel tail current source through the fixed capacitors Cc1 and Cc2, adopts the dynamic switching technology of the tail current source, and reduces the current waveform duty ratio of the cross-coupled negative resistance MOS transistor , and reduces the generation of tail current source MOS transistor traps, thereby reducing the phase noise of the LC-VCO; ​​in addition, the present invention connects the substrate of the cross-coupled negative resistance PMOS to ground, thereby reducing the threshold voltage of the cross-coupled PMOS, so that The current supplied by the negative resistance increases and the phase noise of the LC‑VCO decreases.

Description

technical field [0001] The invention relates to the technical field of inductor-capacitor voltage-controlled oscillators, and more specifically relates to a low-phase-noise LC-VCO. Background technique [0002] As a high-frequency signal generation module, the LCC voltage-controlled oscillator usually provides a low-jitter clock of a certain frequency for other circuits. With the continuous improvement of the communication rate, the frequency requirements of the LC-VCO are also getting higher and higher, and the phase noise requirements of the oscillator at high frequencies are also becoming more and more stringent. [0003] The core of the LC-VCO's oscillation is the capacitor inductance connected in parallel, and since both the inductance and the capacitance have losses, the energy required for oscillation needs to be continuously provided by the outside during the oscillation process. Usually, cross-coupled MOS transistors are used to form a negative resistance to provid...

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
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