DocumentCode :
24654
Title :
A 24–44 GHz Broadband Subharmonic Mixer With Novel Isolation-Enhanced Circuit
Author :
Chun-Chi Su ; Chien-Hung Liu ; Chih-Ming Lin ; Yi-Lun Tsai ; Yeong-Her Wang
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng-Kung Univ., Tainan, Taiwan
Volume :
25
Issue :
2
fYear :
2015
fDate :
Feb. 2015
Firstpage :
124
Lastpage :
126
Abstract :
A 24 to 44 GHz upconversion broadband subharmonic mixer with a novel isolation-enhanced architecture is presented through a 0.15 μm GaAs pHEMT process. Total chip size including probe pads is less than 1.33 × 0.82 mm2. The isolation-enhanced circuit is constructed from two directional couple lines both formed with three microstrip lines. They are used to enhance the isolation between IF/LO-to-RF and LO-to-IF. IF and RF pre-amplifiers are employed to achieve high conversion gain for subharmonic mixing of anti-parallel diode pairs. Based on the unilateral characteristics of an IF pre-amplifier, the LO/RF-to-IF isolations exhibit substantial improvement. From the measured results, the conversion gain of the mixer is 6.0 to 10.5 dB operating at RF frequency of 24 to 44 GHz. The IF-to-RF, LO-to-IF, LO-to-RF, and 2LO-to-RF isolations are 24.5 to 27.1 dB, 32.4 to 39.6 dB, 20.6 to 24.6 dB, and 48.4 to 65 dB, respectively.
Keywords :
HEMT circuits; III-V semiconductors; coupled transmission lines; gallium arsenide; microstrip lines; microwave mixers; millimetre wave mixers; preamplifiers; GaAs; IF pre-amplifier; IF-LO-to-RF; RF pre-amplifiers; anti-parallel diode pairs; directional couple lines; frequency 24 GHz to 44 GHz; gain 6.0 dB to 10.5 dB; isolation-enhanced architecture; isolation-enhanced circuit; loss 24.5 dB to 65 dB; microstrip lines; pHEMT process; probe pads; size 0.15 mum; upconversion broadband subharmonic mixer; Broadband communication; Frequency measurement; Gain; IEC; Mixers; Radio frequency; Wireless communication; Broadband; MMIC; isolation enhanced; subharmonic mixer; up-converter;
fLanguage :
English
Journal_Title :
Microwave and Wireless Components Letters, IEEE
Publisher :
ieee
ISSN :
1531-1309
Type :
jour
DOI :
10.1109/LMWC.2014.2382688
Filename :
7012115
Link To Document :
بازگشت