Title: | 17-GHz pHEMT Gilbert Single-Quadrature Downconverter With Polyphase Filters for Image Rejection |
Authors: | Wei, Hung-Ju Meng, Chinchun Su, Jen-Yi Yu, Sheng-Wen Huang, Guo-Wei 電機學院 電機工程學系 College of Electrical and Computer Engineering Department of Electrical and Computer Engineering |
Issue Date: | 1-Jan-2010 |
Abstract: | A 17-GHz Gilbert single-quadrature down-converter (SQDC) with polyphase filters is successfully demonstrated using 0.15-mu m pseudomorphic high electron mobility transistor (pHEMT) technology for the first time to the best of our knowledge. Thanks to the semi-insulating GaAs substrate and an advanced technology, the image rejection Gilbert mixer works well at high frequencies. A polyphase filter at the LO stage is employed to generate precisely differential quadrature signals and a four-stage polyphase filter at the IF stage can filter out the unwanted image signal to achieve image rejection. From 10-MHz to 90-MHz IF frequencies, a 30-dB image rejection ratio is achieved when RF and LO frequencies are designed around 17 GHz. The Gilbert SQDC has a 5.5-dB conversion gain, 0-dBm IP1db, and 16-dBm IIP3. |
URI: | http://hdl.handle.net/11536/146387 |
Journal: | 2010 ASIA-PACIFIC MICROWAVE CONFERENCE |
Begin Page: | 690 |
End Page: | 693 |
Appears in Collections: | Conferences Paper |