Title :
A 5.2 GHz Linearized SiGe Quadrature Modulator Using Current Feedback from Output Buffer
Author :
Onoma, Fumiki ; Tsutsumi, Koji ; Shinjo, Shintaro ; Suematsu, Noriharu
Author_Institution :
Mitsubishi Electr. Corp, Kamakura
Abstract :
A linearized SiGe up-mixer using current feedback from output buffer is described. The up-mixer consists of a conventional Gilbert cell mixer, an output buffer and a current feedback circuit. According to the output envelope current of the output buffer, the bias current of the mixer is controlled by this feedback circuit. As a result, the proposed up-mixer can realize linearized performance. The simulated P1dB improvements of the proposed up-mixer and the quadrature modulator (QMOD) including this up-mixer are 3.3dB and 1.6dB compared with the conventional types, respectively. The fabricated 5.2 GHz SiGe QMOD achieves the P1dB of -13.9dBm.
Keywords :
Ge-Si alloys; MMIC mixers; bipolar MMIC; buffer circuits; circuit feedback; modulators; Gilbert cell mixer; SiGe; SiGe - Interface; current feedback; frequency 5.2 GHz; linearized quadrature modulator; linearized up-mixer; output buffer; Circuit simulation; Energy consumption; Equations; Feedback circuits; Germanium silicon alloys; MMICs; Mirrors; Output feedback; Silicon germanium; Transceivers; microwave bipolar transistor; monolithic microwave integrated circuit (MMIC) up-mixer; silicon;
Conference_Titel :
Microwave Conference, 2007. KJMW 2007. Korea-Japan
Conference_Location :
Okinawa
Print_ISBN :
978-1-4244-1556-4
DOI :
10.1109/KJMW.2007.4402237
