Unlock instant, AI-driven research and patent intelligence for your innovation.

Multi waveband portable wireless terminal

A wireless terminal and portable technology, applied in the field of multi-band portable wireless terminals, can solve problems such as high speed difficulties

Inactive Publication Date: 2002-05-22
SONY CORP
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is very difficult to achieve high speed with the circuit configuration shown in Figure 6

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi waveband portable wireless terminal
  • Multi waveband portable wireless terminal
  • Multi waveband portable wireless terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. figure 1 is a block diagram showing a general configuration of a communication terminal according to an embodiment of the present invention. figure 1 The terminal shown in is a multi-band portable telephone device (multi-band portable wireless terminal) that can operate in three modes: GSM (also known as Pan-European Digital Cellular Telephone System) mode, DCS mode, UMTS (WCDMA) mode. Therefore, the terminal can be used as a multi-band system terminal compatible with both services of the TDMA system and the CDMA system.

[0049] Depend on figure 1 The RF signal received by the antenna 511 of the terminal shown in , passes through the signal path formed by the filter (band-pass filter) and the converter (S / W) converted according to the above-mentioned manner, and then input to the receiving signal processing unit function of an RF rec...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The output of a transmitting voltage-controlled oscillator generated in an offset PLL is used as a signal source for a variable frequency input side of an image removing mixer for generating a local oscillation signal for GSM / DCS reception. A signal obtained by dividing an IF frequency generated by a transmission intermediate frequency (IF) PLL used for the offset PLL for generating a transmission frequency signal is employed for the other input of the image removing mixer. A desired frequency is thereby generated before the mixers of a demodulator.

Description

technical field [0001] The present invention relates to a multi-band portable wireless terminal compatible with various mobile communication systems such as GSM / DCS / UMTS. Background technique [0002] Conventionally, an example using a direct conversion (DCR) method has been proposed in order to reduce the circuit scale of a radio frequency (RF) unit in a small portable wireless terminal. As described below, when in a portable terminal of a communication system such as GSM (Global System for Mobile Communications) / DCS (Digital Cellular System) / UMTS (Universal Mobile Telecommunications System) having two different methods and different frequency bands to be introduced in the future When used, this DCR contributes to miniaturization of portable terminals. [0003] 4A and 4B are block diagrams showing a comparison between the heterodyne reception method (FIG. 4A) and the direct conversion method (FIG. 4B). Devices using the heterodyne reception meth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L27/14H04B1/3822H04B1/40H04B7/26H04L27/22H04W88/06
CPCH04B1/005H04B1/406
Inventor 高木光太郎
Owner SONY CORP