COMMUNICATION SEMICONDUCTOR INTEGRATED CIRCUIT AND RADIO COMMUNICATION SYSTEM

Title:

COMMUNICATION SEMICONDUCTOR INTEGRATED CIRCUIT AND RADIO COMMUNICATION SYSTEM

Document Type and Number:

Japanese Patent JP2005020120

Kind Code:

A

Abstract:

To realize a communication semiconductor integrated circuit having a high gain amplifier circuit enabling a gain allotment with a comparatively high degree of freedom, using control codes with a small number of bits.

The communication semiconductor integrated circuit (high frequency IC) has high gain amplifier circuits (240a, 240b) for amplifying received signals into signals of a specified amplitude level while removing unwanted waves with a plurality of low-pass filters (LPF1-LPF3), and variable-gain amplifiers (PGA1-PGA3) alternately connected in a multiple stage to the amplifier circuits. The gain of the variable gain amplifier in each stage is controllable from outside, and gain allotments not very meaningful in the characteristics are disabled from setting among settable gain allotments.

More Like This:

WO/2008/103757	AMPLIFIER WITH INTEGRATED FILTER
JPS6313409	AUTOMATIC GAIN CONTROL CIRCUIT
JP3304886	AUTOMATIC GAIN CONTROL METHOD, ITS DEVICE AND COMMUNICATION RECEIVER

Inventors:

HABUKA TOSHITO
INOKAWA NAOTO
OZAKI KIYOHARU
MATSUURA TATSUJI
YAHAGI KOICHI

Application Number:

JP2003178985A

Publication Date:

January 20, 2005

Filing Date:

June 24, 2003

Export Citation:

Click for automatic bibliography generation Help

Assignee:

RENESAS TECH CORP

International Classes:

H03G3/20; H03G3/30; H04B1/16; H04B1/40; (IPC1-7): H03G3/20; H03G3/30; H04B1/16; H04B1/40

Attorney, Agent or Firm:

Tomio Dainichi

Previous Patent: SEMICONDUCTOR INTEGRATED CIRCUIT FOR COMMUNICATION, WIRELESS COMMUNICATION SYSTEM, AND ADJUSTMENT ME...

Next Patent: SEMICONDUCTOR INTEGRATED CIRCUIT FOR COMMUNICATION, WIRELESS COMMUNICATION SYSTEM, AND CORRECTION ME...