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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 problems such as reducing LC-VCO

Active Publication Date: 2014-09-17
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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Embodiment Construction

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

[0024] figure 2 A circuit diagram of a low phase noise LC-VCO according to a preferred embodiment of the present invention; the low phase noise LC-VCO includes PMOS tubes Mp1, Mp2, Mp3, Mp4; NMOS tubes Mn1, Mn2; fixed capacitors C1, C2, Cc1, Cc2; variable capacitors Cvar1, Cvar2; inductor ind at both ends; resistors R1, R2;

[0025] The anodes of the variable capacitors Cvar1 and Cvar2 are both connected to the capacitor adjusting 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 Between nodes VCON; the two-terminal capacitor ind is connected between the VCOP and VCON; the two-terminal cap...

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Abstract

The invention discloses a low phase noise LC-VCO which comprises a PMOS tube Mp1, a PMOS tube Mp2, a PMOS tube Mp3, a PMOS tube Mp4, an NMOS tube Mn1, an NMOS tube Mn2, a fixed capacitor C1, a fixed capacitor C2, a fixed capacitor Cc1, a fixed capacitor Cc2, a variable capacitor Cvar1, a variable capacitor Cvar2, inductors ind at two ends, a resistor R1 and a resistor R2. Through the fixed capacitor Cc1 and the fixed capacitor Cc2, oscillation voltage waveforms are coupled to the grid electrodes of PMOS tubes of tail current sources which are connected in parallel, the tail current source dynamic switching technology is adopted, the current waveform duty ratio of the negative resistance MOS tubes which are in cross coupling is reduced, traps of the MOS tubes of the tail current sources are reduced, and phase noise of the LC-VCO is lowered. In addition, substrates of negative resistance PMOSs which are in cross coupling are connected with the ground, the threshold voltages of the PMOSs which are in cross coupling are reduced, currents provided by negative resistance are increased, and the phase noise of the LC-VCO is lowered.

Description

Technical field [0001] The invention relates to the technical field of inductance-capacitance voltage-controlled oscillators, and more specifically to a low-phase noise LC-VCO. Background technique [0002] As a high-frequency signal generation module, the inductor-capacitor 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 for the LC-VCO are getting higher and higher, and the phase noise requirements for the oscillator at high frequencies are becoming more and more stringent. [0003] The core of the LC-VCO's oscillation is the capacitor and inductor in parallel, and since both the inductor and the capacitor have losses, the outside world needs to continuously provide the energy required for the oscillation during the oscillation process. Under normal circumstances, the use of cross-coupled MOS transistors to form a negative resistance c...

Claims

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Application Information

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Patent Type & Authority Applications(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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