Title :
Calibration techniques of active BiCMOS mixers
Author :
Parssinen, Aarno ; Ryynanen, Jussi ; Jussila, Jari
fDate :
6/1/2002 12:00:00 AM
Abstract :
This paper describes calibration techniques for downconversion mixers used in integrated direct-conversion receivers. A method of achieving a high even-order intermodulation rejection is presented. Using the method presented, the receiver second-order input intercept point (IIP2) can always be improved by more than 20 dB. The minimum achieved receiver IIP2 after calibration is +38 dBm. A technique to enhance the I/Q-amplitude balance between the quadrature channels is also introduced. A single-balanced adjustable mixer is implemented as a part of a prototype direct-conversion receiver. The receiver chip consists of a low-noise amplifier, mixers and calibration circuitry, a divide-by-two circuit, local oscillator (LO) buffers for LO generation, and active baseband filters. The chip is fabricated using a 0.35-μm SiGe BiCMOS process and is characterized at 900 MHz
Keywords :
BiCMOS analogue integrated circuits; UHF integrated circuits; UHF mixers; calibration; cellular radio; circuit tuning; radio receivers; 900 MHz; I/Q-amplitude balance; SiGe; active BiCMOS mixers; active baseband filters; analog integrated circuits; calibration circuitry; calibration techniques; divide-by-two circuit; downconversion mixers; high even-order intermodulation rejection; integrated direct-conversion receivers; local oscillator buffers; low-noise amplifier; radio receivers; second-order input intercept point; single-balanced adjustable mixer; wireless cellular radios; Baseband; BiCMOS integrated circuits; Calibration; Filters; Local oscillators; Low-noise amplifiers; Multiaccess communication; Receivers; Time division multiple access; Wideband;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2002.1004581
