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LC orthogonal voltage controlled oscillator capable of reducing flicker noise

A voltage-controlled oscillator and oscillator technology, applied in power oscillators, improving frequency converters, electrical components, etc., can solve the problems of increased power consumption, difficult phase-shift network design, large signal amplitude and phase mismatch, etc. Achieve the effect of reducing 1/f noise

Inactive Publication Date: 2008-05-21
FUDAN UNIV
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Problems solved by technology

However, the Q value of the former’s on-chip inductor is mainly limited by the process and is generally lower than 10, while the precision of the bonding wire inductor is very low, which will lead to a relatively large amplitude and phase mismatch of the I / Q two-way signal; the latter, The design of the phase shift network is relatively difficult and will increase power consumption

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  • LC orthogonal voltage controlled oscillator capable of reducing flicker noise
  • LC orthogonal voltage controlled oscillator capable of reducing flicker noise
  • LC orthogonal voltage controlled oscillator capable of reducing flicker noise

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Embodiment Construction

[0024] The purpose, advantages and principles of the present invention will be described below in conjunction with the accompanying drawings, the above summary and the following examples.

[0025] Fig. 1 produces the traditional QVCO structure of quadrature signal. The generation of quadrature signals will be described below with reference to FIG. 1 , FIG. 2 and FIG. 3 . Among them, NMOS transistor M1A and NMOS transistor M2A, NMOS transistor M1B and NMOS transistor M2B respectively provide negative resistance for two VCOs; NMOS transistor M3A and NMOS transistor M4A provide cross-orthogonal coupling paths for two VCOs, NMOS transistor M3B and NMOS transistor M4B Provides direct quadrature coupling paths for two VCOs. Since a cross-coupling equivalent circuit will produce a 180-degree phase shift, assume that the phase delays of the two VCOs are φ A and φ B , usually the two are equal, that is, φ A = φ B = φ. According to the Barkhausen criterion, if the phase delay in t...

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Abstract

The invention relates to an LC quadrature VCO (voltage controlled oscillator) which can reduce the intermittent noise, belonging to the technical field of integrated circuit, . The invention is characterized in that two negative resistance oscillators are connected together with a quadrature coupler to output quadrature signals; the reduced phase noise is implemented by using a more linear narrow-band turning variable capacitor structure, multiband switching digital array with a lower parasitic capacitance and an intermittent noise eliminating circuit reducing the intermittent noise getting into the LC oscillator when inputting voltage crossing the zero point.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to an LC quadrature oscillator which can reduce flicker noise and is applied to a quadrature voltage-controlled oscillator (abbreviated as QVCO). technical background [0002] With the development of communication technology, the image suppression transceiver structure using orthogonal up-conversion or down-conversion technology has been widely used, and this image suppression circuit transceiver needs to provide orthogonal local carrier signals. [0003] A traditional QVCO circuit structure for generating quadrature signals is shown in FIG. 1 , which directly outputs quadrature signals by quadrature coupling two LC oscillators (hereinafter referred to as "VCO"). Phase noise and phase error are two key performance indicators of QVCO. Because the equivalent quality factor of the resonant cavity is significantly reduced, the phase noise of this QVCO is relativ...

Claims

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Application Information

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IPC IPC(8): H03B5/12H03D7/18
CPCH03B27/00
Inventor 李巍郑剑钦
Owner FUDAN UNIV
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