Title :
An Intuitive Current-Driven Passive Mixer Model Based on Switched-Capacitor Theory
Author :
Sosio, M. ; Liscidini, Antonio ; Castello, Rinaldo
Author_Institution :
Univ. degli Studi di Pavia, Pavia, Italy
Abstract :
An intuitive current-driven passive mixer model is presented. Without using complex math, it provides a signal-transfer-function/noise description of a passive mixer when used in a wireless receiver (RX) chain driven by a transconductor and loaded by a low-pass baseband (BB). Exploiting a switched-capacitor approach, the model represents a useful tool for simple hand analysis and design. The case of a 25%-duty-cycle quadrature RX chain based on a transimpedance amplifier at BB is analyzed in detail and compared with simulations, showing good accuracy.
Keywords :
mixers (circuits); operational amplifiers; radio receivers; switched capacitor networks; transfer functions; BB; complex math; current-driven passive mixer model; intuitive current-driven passive mixer model; low-pass baseband; signal noise description; signal transfer-function; simple hand analysis; simple hand design; switched-capacitor approach; switched-capacitor theory; transconductor; transimpedance amplifier-based-duty-cycle quadrature RX chain; wireless receiver chain; Analytical models; Impedance; Integrated circuit modeling; Load modeling; Mixers; Noise; Radio frequency; Current-driven passive mixers; down-conversion gain; noise figure; quadrature chain; wireless receivers (RXs);
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2012.2234993
