Title :
A novel image-rejection amplifier for wireless communications
Author :
Chang, Sheng-Fuh ; Chen, Jia-Liang ; Liu, Cheng-Cheng
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Cheng Univ., Ming-Hsiung, Taiwan
Abstract :
The theory and design of a high-gain amplifier with image rejection capability is described, where the image rejection is accomplished by placing the transmission zeroes in the impedance match circuitry. The resulting amplifier provides high gain as well as high image rejection ratio. A 5.8 GHz image-rejection amplifier was designed and fabricated to verify the proposed technique. The measured results show 22 dB gain in the ISM band (5.725-5.850 GHz) and at least 43 dB image rejection at the image frequencies of 5.4 GHz and 6.15 GHz, which agree very well with the predicted theory
Keywords :
impedance matching; poles and zeros; radiofrequency amplifiers; transceivers; 22 dB; 5.4 GHz; 5.725 to 5.850 GHz; 5.8 GHz; 6.15 GHz; ISM band; RF front-end transceiver; gain; image rejection amplifier; impedance matching circuit; transmission zeroes; wireless communication; Circuits; Filtering theory; Filters; Gain measurement; Impedance matching; Microstrip; Radio frequency; Shape measurement; Transceivers; Wireless communication;
Conference_Titel :
Microwave Conference, 2001. APMC 2001. 2001 Asia-Pacific
Conference_Location :
Taipei
Print_ISBN :
0-7803-7138-0
DOI :
10.1109/APMC.2001.985285
