Title :
A single MESFET down-converter for TVRO application
Author :
Caceres, J.L. ; Perez, J.
Author_Institution :
Polytech. Univ., Madrid, Spain
Abstract :
A compact downconverter for use in TV receive-only (TVRO) receivers is presented. The circuit consists of an image-rejection filter and a self-oscillating mixer performing as a block which converts RF into IF signals. The downconverter´s features are fully comparable to those of conventional structures, with the additional advantage that only one MESFET is required, leading to a more compact and reliable design. Average results on a band of 800 MHz (10.95-11.75 GHz with a local oscillator frequency of 10 GHz) gives a conversion gain of 4.5 dB, 8-dB single-sideband (SSB) noise figure, and more than 40-dB image rejection.<>
Keywords :
direct broadcasting by satellite; field effect transistor circuits; frequency convertors; hybrid integrated circuits; microwave integrated circuits; microwave oscillators; mixers (circuits); television receivers; 10 GHz; 10.95 to 11.75 GHz; 4.5 dB; 40 dB; 8 dB; 800 MHz; DBS; TV receive only receivers; TVRO; compact downconverter; conversion gain; features; image rejection; image-rejection filter; local oscillator frequency; noise figure; reliable design; self oscillating mixers; self-oscillating mixer; single MESFET down-converter; single-sideband; Circuits; Filters; Frequency conversion; Gain; Image converters; Local oscillators; MESFETs; RF signals; Radio frequency; TV receivers;
Conference_Titel :
Microwave Symposium Digest, 1988., IEEE MTT-S International
Conference_Location :
New York, NY, USA
DOI :
10.1109/MWSYM.1988.22147
