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Capacitor coupled quadrature voltage controlleed oscillator

A quadrature oscillation and quadrature signal technology, applied in power oscillators, electrical components, etc., can solve problems such as phase noise reduction, less voltage margin, resonance frequency effect, etc., to improve phase noise performance and compact chip area. Effect

Active Publication Date: 2012-05-16
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For a quadrature oscillator that couples two differential oscillators that use active devices such as transistors, this existing quadrature oscillator produces phase noise reduction due to increased noise sources, and additional power consumption, Less voltage headroom and / or LC resonant frequency impact

Method used

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  • Capacitor coupled quadrature voltage controlleed oscillator
  • Capacitor coupled quadrature voltage controlleed oscillator
  • Capacitor coupled quadrature voltage controlleed oscillator

Examples

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Embodiment Construction

[0032] The following will clearly illustrate the spirit of the present invention with the accompanying drawings and detailed descriptions. After understanding the preferred embodiments of the present invention, any person of ordinary skill in the art can make changes and modifications based on the technology disclosed in the present invention, and without departing from the spirit and scope of the present invention.

[0033] figure 1 A schematic diagram of a quadrature oscillator 100 according to an embodiment of the present invention is shown. The quadrature oscillator 100 is used in two differential voltage controlled oscillator (VCO) circuits 101 and 103 . The oscillator 101 includes inductors L1 and L2, a capacitor Ca, and NMOS transistors M1 and M2. It also includes a current source I1. The sources of NMOS transistors M1 and M2 are coupled to current source I1 at node 102, which is also coupled to one end of capacitor C1.

[0034] Likewise, the oscillator 103 includes...

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Abstract

A quadrature oscillator includes a first oscillator having a first second-order harmonic node, a second oscillator having a second second-order harmonic node, and at least one capacitor coupling the first second-order harmonic node and the second second-order harmonic node. The first oscillator is configured to supply an in-phase signal and the second oscillator is configured to supply a quadrature signal.

Description

technical field [0001] The invention relates to an integrated circuit, in particular to a voltage-controlled oscillator. Background technique [0002] A local oscillator (LO) signal is an essential element of direct conversion and wireless communication technologies, such as low intermediate frequency (IF) in quadrature amplitude modulation (QAM) systems. Quadrature amplitude modulation is a modulation method for communication signals. This method transmits two signals, an in-phase signal (I) and a quadrature signal (Q), and transmits them with amplitude modulation of these two carriers. The phases of the carriers of signals I and Q are 90 degrees out of phase. [0003] The quadrature signals (I and Q) can be generated by different methods. Existing differential oscillators utilize divide-by-two circuits to operate at twice the desired frequency, but suffer from poor quadrature accuracy and can consume significant power. Another differential oscillator utilizing a polyph...

Claims

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Application Information

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IPC IPC(8): H03B27/00H03B5/20
CPCH03B5/1228H03B27/00H03B5/1215
Inventor 吕盈达陈和祥周淳朴薛福隆
Owner TAIWAN SEMICON MFG CO LTD
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