Title :
An analysis of voltage-driven passive-mixer based SAW-less transmitters
Author_Institution :
Marvell Semicond., Aliso Viejo, CA, USA
Abstract :
An Analysis based on time domain simulation of a transmitter based on voltage-driven passive mixer is described here. SAW-less multi-mode (2G/3G) transmitter requires very low noise at RX band frequency to not desensitize the receiver for 3G mode and also meet -164dBc/Hz at 20MHz offset to meet the modulation mask in 2G mode. As compared to conventional Gilbert cell mixer based designs, the voltage driven passive-mixer operates from a lower power supply voltage, has zero power consumption, and lower noise. The key to achieving SAW-less operation is the low-noise passive mixer and a baseband (BB) anti-alias filter. The analysis here describes the detail of different loading on the passive-mixer and the base-band filter and the effect of different designs on the output power, linearity and required base-band current.
Keywords :
3G mobile communication; low-power electronics; mixers (circuits); modulation; passive networks; transmitters; 2G transmitter; 3G transmitter; RX band frequency; SAW-less transmitters; anti-alias filter; base-band filter; lower power supply voltage; modulation mask; time domain simulation; voltage-driven passive mixer; voltage-driven passive-mixer analysis; zero power consumption; Capacitance; Mathematical model; Mixers; Multiaccess communication; Noise; Power generation; Transmitters; EGPRS; SAW-less; WCDMA; Wireless transmitters; filter; low noise; low voltage; multi-mode; passive mixer;
Conference_Titel :
Circuits and Systems for Communications (ECCSC), 2010 5th European Conference on
Conference_Location :
Belgrade
Print_ISBN :
978-1-61284-400-8
