A CMOS self-mixing-free front-end for direct conversion applications

A CMOS self-mixing-free RF front-end for direct-conversion receivers is presented, which includes a differential LNA, a ring oscillator, and I/Q double-balanced harmonic mixers and buffers. It operates at 930 MHz, achieves 51 dB gain and 5.8 dB spot noise figure at 100 kHz frequency, and consumes 53 mW power. A 54 dB self-mixing improvement over traditional architecture is obtained. The front-end is entirely self-mixing-free and suitable for direct-conversion applications.

[1]  J. Lau,et al.  Direct conversion for FLEX paging receivers-A feasibility study , 1998, 1998 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.98CH36182).

[2]  J. Lau,et al.  Direct conversion for FLEX paging receivers-a feasibility study , 1998, 1998 IEEE MTT-S International Microwave Symposium Digest (Cat. No.98CH36192).

[3]  S. Mehta,et al.  A single-chip CMOS direct-conversion transceiver for 900 MHz spread-spectrum digital cordless phones , 1999, 1999 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC. First Edition (Cat. No.99CH36278).

[4]  B. Fransis,et al.  A fully integrated broadband direct-conversion receiver for DBS applications , 2000, 2000 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.00CH37056).

[5]  H. Kokatsu,et al.  An I/Q active balanced harmonic mixer with IM2 cancelers and a 45/spl deg/ phase shifter , 1998, 1998 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, ISSCC. First Edition (Cat. No.98CH36156).

[6]  Behzad Razavi,et al.  Design considerations for direct-conversion receivers , 1997 .

[7]  R. Gotzfried,et al.  A DECT transceiver chip set using SiGe technology , 1999, 1999 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC. First Edition (Cat. No.99CH36278).

[8]  C. Holenstein,et al.  Adaptive dual-loop algorithm for cancellation of time-varying offsets in direct conversion mixers , 2000, RAWCON 2000. 2000 IEEE Radio and Wireless Conference (Cat. No.00EX404).

[9]  J. Lau,et al.  A 900 MHz CMOS balanced harmonic mixer for direct conversion receivers , 2000, RAWCON 2000. 2000 IEEE Radio and Wireless Conference (Cat. No.00EX404).