A 900 MHz transceiver chip set for dual-mode cellular radio mobile terminals

Abstract

A chip set for compact transceivers meeting IS54 dual-mode cellular telephone standards is described. It consists of a direct up-conversion modulator and a double conversion receiver in a 12-GHz super-self-aligned bipolar process. It is operated from a 5-V power supply, and the total power dissipation is 310 mW. Both circuits can be put into a power-down mode with a maximum off-current of 10 mu A. The modulator chip is 4.1 mm/sup 2/, and the receiver chip is 4.9 mm/sup 2/.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>