Quadrature phase oscillator using complex coefficient filter

A quadrature phase, oscillator technology, used in the field of radio frequency transceiver integrated circuits, can solve the problems of large power consumption and increased current consumption

Inactive Publication Date: 2006-12-20
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the FF that performs the division function should be implemented, and in order to drive the FF, a large amount of power is consumed
Moreover, the master-slave FF generates a higher than desired oscillation frequency 2 N times the frequency, causing an increase in current consumption

Method used

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  • Quadrature phase oscillator using complex coefficient filter
  • Quadrature phase oscillator using complex coefficient filter
  • Quadrature phase oscillator using complex coefficient filter

Examples

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Embodiment Construction

[0016] Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, detailed descriptions of well-known functions and structures incorporated herein will be omitted for conciseness.

[0017] figure 1 is a block diagram of a quadrature phase oscillator 20 using a complex coefficient filter according to the present invention.

[0018] refer to figure 1 , the quadrature phase oscillator 20 according to the present invention uses a complex coefficient surface acoustic wave (SAW) filter 22 instead of a conventional R-C polyphase filter or a master-slave flip-flop (FF) to generate I / Q signals.

[0019] According to the present invention, the quadrature phase oscillator 20 includes a voltage controlled oscillator (VCO) 12 , a buffer 14 and a complex coefficient SAW filter 22 . The VCO 12 supplies the oscillation frequency for modulating the transmission / reception signal according to the a...

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PUM

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Abstract

A quadrature phase oscillator in a Radio Frequency (RF) transceiver Integrated Circuit (IC) is provided. The quadrature phase oscillator includes a voltage controlled oscillator and a filter. The voltage controlled oscillator provides an oscillating frequency for modulation of a transmission / reception signal according to an applied voltage. The filter receives the oscillating frequency from the voltage controlled oscillator as an input, passes one of a negative frequency component of the input oscillating frequency and a positive frequency component of the input oscillating frequency, attenuates the other frequency component, generates an I (In phase) signal that is in phase with the input oscillating frequency and a Q (Quadrature phase) signal having a phase difference of 90 DEG with the input oscillating frequency for the passed frequency component, and outputs the I signal and the Q signal.

Description

technical field [0001] The present invention relates to a radio frequency (RF) transceiver integrated circuit (IC), and more particularly, to a quadrature phase oscillator for use in an RF transceiver IC. Background technique [0002] Typically, radio frequency (RF) transceiver integrated circuits (ICs) use I / Q modulation to transmit and receive data. I / Q modulation includes modulating a transmission / reception signal into a quadrature signal in which an in-phase (I) signal and a quadrature-phase (Q) signal are orthogonal to each other. In I / Q modulation, in order to represent a transmission / reception signal in a complex coordinate system, the real component of the transmission / reception signal is represented as an I signal, and the imaginary component of the transmission / reception signal is represented as a Q signal. [0003] RF transceiver ICs generally use a voltage-controlled oscillator (VCO) that oscillates at a predetermined frequency according...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B27/00H04L27/00
CPCH03B27/00H04L27/18H03L7/00
Inventor 全时范朴尚根李愚涌
Owner SAMSUNG ELECTRONICS CO LTD
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