An Ultra Low Cost And Miniature 950-2050 MHz Gaas MMIC Downconverter-I: Design Approach And Simulation

Ting Hua Hsieh, Huei Wang, Tahui Wang*, Tzu Hung Chen, Yit Chyun Chiang, San Tien Tseng, Andy Chen, Edward Yi Chang

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review


A miniature ultra low cost 950-2050 MHz GaAs MMIC downconverter has been designed for satellite TV application using a 1-p.m gate-length, ion-implanted GaAs MESFET foundry process. To accurately predict circuit performances, both linear and nonlinear equivalent circuit models have been developed to characterize the RF and dc behaviors of device. Modeled simulation results show correspondence with the experimental data. This monolithic downconverter is comprised of an RF LNA, a dual-gate MESFET mixer, an IF variable gain amplifier, and a varactor tuned oscillator. The primary design specifications are (1) 50-dB conversion gain, (2) 4-dB noise figure, (3) more than 40-dB gain controllable range, and (4) 50-dBc third-order intermodulation distortion. The chip size is 1.4 x 1.5 x 0.18 mm3. It is encapsulated in a standard low cost plastic package. Moreover, this downconverter IC is promising for miniaturization and cost-reduction of a DBS receiver The detailed measured characteristics will be presented in part-II of this paper.

Original languageEnglish
Pages (from-to)437-444
Number of pages8
JournalJournal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Issue number3
StatePublished - 04 1995
Externally publishedYes


  • Downconverter
  • MMIC


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