Keiro Shinkawa

A high quality GaAs IC tuner for TV/VCR receivers

A GaAs MESFET IC for a three-band (VHF/CATV/UHF) tuner is described. The IC can be used in TVs or video cassette recorders (VCRs). The IC incorporates VHF/CATV and UHF oscillators, buffer amplifiers for the oscillator signals, a double balanced mixer, a VHF/CATV-UHF switch buffer amplifiers, and an intermediate-frequency (IF) amplifier. Each circuit element is detailed. This IC makes full use of high linearity (low distortion) and the high maximum frequency of GaAs MESFETs. The IC overcomes high 1/f noise by careful circuit design. >

A compact satellite 1 GHz tuner with GaAs ICs

The authors have designed two types of GaAs ICs, an RF amplifier and a converter. The amplifier has a stable input impedance. The converter has two AGC (automatic gain control) system (RF and IF AGC) and a wide input signal range with a good intermodulation characteristic. These ICs make full use of the good input versus output linearity and high mobility of a GaAs MESFET and have been integrated into a small chip. Using these ICs, the authors have developed a 1-GHz satellite tuner. This tuner can receive the 0.95-1.75-GHz BS frequency band and offers novel functions such as reception of two satellite broadcasting signals. The components of this tuner can be reduced by using GaAs ICs, making the most compact tuner to date (40 cm/sup 3/). >

Microwave Integrated Circuit Module for an SHF to UHF Television Converter

The authors have developed an SHF (from 11.7 GHz to 12.2 GHz) to UHF television converter of new circuit structure using a microwave integrated circuit (MIC) module.

Integrated SHF Converter Formed on a Single Teflon-Fiberglas Substrate

We have successfully developed a high performance SHF TV converter which converts 12 GHz incoming signal down to UHF TV band.

Low Noise Integrated SHF Converter for Satellite TV Broadcasting

We have successfully developed a high performance SHF converter for satellite TV broadcasting system, which converts the 12GHz incoming signal down to the 1GHz signal.

Development of HDTV Receiving Equipment Based on Band Compression Technique (MUSE)

It is about sixteen years since the Investigation of High-definition television (HDTV) system was started by NHK (Japan Broadcasting Corporation), and its outstanding picture quality has already demonstrated on various occasions.(1)