Title :
A monolithic 5.9-GHz CMOS I/Q direct-down converter utilizing a quadrature coupler and transformer-coupled subharmonic mixers
Author :
Chen, Hsiao-Chin ; Wang, Tao ; Lu, Shey-Shi ; Huang, Guo-Wei
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
4/1/2006 12:00:00 AM
Abstract :
We report the first monolithic 5.9-GHz CMOS I/Q direct-down converter by using a quadrature coupler and transformer-coupled subharmonic mixers (SHMs). Consuming 3.5mW, each SHM achieves a voltage gain of 10.8dB, 7.9-dBm IIP3, and 54-dBm IIP2. The input-referred dc-offset due to local oscillator self-mixing is -80.9dBm.
Keywords :
CMOS integrated circuits; MMIC mixers; convertors; waveguide couplers; 10.8 dB; 3.5 mW; 5.9 GHz; input-referred dc-offset; local oscillator self-mixing; monolithic CMOS I-Q direct-down converter; quadrature coupler; transformer coupled subharmonic mixers; Coupling circuits; Gain; Linearity; Local oscillators; Microwave transistors; RF signals; Radio frequency; Signal generators; Switches; Transconductors; Coupler; direct-down conversion; subharmonic mixer (SHM); transformer;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.872123
