Home | Links | Contact Us | More About Intellectual Property | Bookmark

Search patents:

Home

Ring Tones

Quadrature-signal-generator-with-feedback-type-frequency-doubler

Communication device and method of operation

OF EMBODIMENTS Embodiments of the present invention are described below, by way of example only. T...

Portable electronic device

OF THE INVENTION At first, the first embodiment will be explained with reference to FIG. 1. In the ...

Portable communication apparatus having a hierarchical menu system and a dynamic menu

It is an object of the present invention to provide an improved menu system for a portable ...

Method of and apparatus for pilot channel acquisition

What is claimed is: 1. A method of acquiring a pilot channel in a Code-Division Multiple Access ...

Paging of mobile station in a cellular radio system

OF THE INVENTION The present invention may be applied in connection with any mobile communications ...

Base station synchronization for handover in a hybrid GSM/CDMA network

It is an object of the present invention to provide methods and apparatus for use in a mixed TDMA/CD...

Radio communication booster for portable radio transceivers

What is claimed is: 1. A radio apparatus for a mobile radio, comprising an antenna output ...

Paging system for washers and dryers

In the view of the foregoing disadvantages inherent in the known types of remote control devices ...

Method for executing automatic calling function in a cordless telephone system

Accordingly, it is therefore an object of the present invention to provide an improved cordless ...

Image trap filter

OF THE INVENTION Referring now to the drawing, in which like reference numbers refer to like ...

Quadrature signal generator with feedback type frequency doubler

Details

Inventors: Oh, Seung Min; Kwon, Hyo Seok;
Assignee: Samsung Electro-Mechanics Co., Ltd. (Kyungki-do, KR)
Primary Examiner: Vuong; Quochien B.
Assistant Examiner:
Attorney, Agent or Firm: Lowe Hauptman & Berner, LLP

Disclosed is a quadrature signal generator for generating an in-phase signal and a quadrature-phase signal, which is capable of generating a quadrature signal having the same frequency as a differential oscillating frequency, using a feedback control system. The quadrature signal generator includes an oscillator for generating a differential oscillation frequency signal having predetermined differential oscillation frequencies; a feedback type frequency doubler for generating a differential frequency signal having differential frequency components corresponding to differential frequency components of a frequency sum signal obtained by summing the differential oscillation frequency signal received from the oscillator and a differential feedback signal received at the differential feedback terminal; and a frequency divider for dividing the differential frequency signal received at the differential input terminal thereof by 2, thereby generating a quadrature signal consisting of two differential output frequency signals to supply at least one differential output frequency signal of the quadrature signal to the feedback type frequency doubler as the differential feedback signal.

DETAILED DESCRIPTION The present invention has been made in view of the above mentioned problems, and an object of the invention is to provide a quadrature signal generator for generating I and Q signals while having a feedback type frequency doubler capable of making the Q signal have the same frequency as a differential oscillating frequency, using a feedback control system.
Another object of the invention is to provide a quadrature signal generator with a feedback type frequency doubler which is capable of securing more reliable symmetric characteristics.
In accordance with the present invention, these objects are accomplished by providing a quadrature signal generator comprising: an oscillator for generating a differential oscillation frequency signal having predetermined differential oscillation frequencies; a feedback type frequency doubler having a differential input terminal connected to an output terminal of the oscillator while having a differential feedback terminal and a differential output terminal, the feedback type frequency doubler generating a differential frequency signal having differential frequency components corresponding to differential frequency components of a frequency sum signal obtained by summing the differential oscillation frequency signal received from the oscillator and a differential feedback signal received at the differential feedback terminal, and outputting the differential frequency signal at the differential output terminal; and a frequency divider having a differential input terminal connected to the differential output terminal of the feedback type frequency doubler, and a quadrature output terminal including two differential output terminals, the frequency divider dividing the differential frequency signal received at the differential input terminal thereof by 2, thereby generating a quadrature signal consisting of two differential output frequency signals each having differential frequency components, and outputting the quadrature signal through the quadrature output terminal thereof to supply at least one differential output frequency signal of the quadrature signal to the feedback type frequency doubler as the differential feedback signal

Related patents

	System and method for locating misplaced items A system for locating lost keys or other items includes a compact, pocket-sized device that includes a key chain. The device includes a sound generator that generates a ...
	Voice mail intervention The present invention comprises a system, method, and apparatus for retrieving a telephone call that has been diverted by a telecommunications exchange from a called ...
	Wireless centrex call screen The instant invention addresses this need for an untethered communication systems created by the paradigm shift towards a more flexible and decentralized working ...
	Method for associating one directory number with two mobile stations within a mobile telecommunications network The present invention discloses a method and apparatus for correlating a single MSISDN number with two International Mobile Subscriber Identity (IMSI) numbers, each ...
	Location updating in a cellular radio system An object of the present invention is a cellular radio network in which the signalling load caused by both the paging of a subscriber and location updating is reduced. T...
	Control signal transmission in digital radio telephony We claim: 1. A method of transmission of system broadcast control signals in time slots within fixed length time frames, comprising: coding said system broadcast control ...
	Paging transceivers and methods for selectively retrieving messages The present invention solves the problems described above with methods and systems for selective paging. A paging system notifies a paging transceiver that a message has ...
	Method and system for assigning multiple directory numbers (DN) to a personal communication system (PCS) telephone What is claimed: 1. A method, for use in a switching system, for activating one of a plurality of directory numbers (DNs) assigned to a mobile telephone handset, said ...
	Mobile terminal for transmission diversity CDMA communication system What is claimed is: 1. A mobile terminal which transmits a control command to a base station which is provided with two or more antennas for transmission diversity, ...
	Telephone having an audio response function OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a telephone having an automatic audio response function according to the present invention is provided with a ...

0.014
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved