Title :
A novel BJT output stage for SAW drivers
Author :
Stadius, Kari ; Järviö, Petri ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
fDate :
6/23/1905 12:00:00 AM
Abstract :
A receiver chain followed by a SAW filter suffers from a high current consumption in the last stage used for driving the filter. In this paper a new feedback scheme for improving the efficiency of a SAW driver is proposed. The required DC current in small-signal conditions is reduced with a factor of two and, at the same time, linearity is significantly improved. In addition, three 30-dB gain IF-amplifiers are described. The circuits are simulated with device models from a 0.9 μm SiGe HBT process
Keywords :
Ge-Si alloys; circuit feedback; driver circuits; heterojunction bipolar transistors; intermediate-frequency amplifiers; semiconductor materials; surface acoustic wave filters; 0.9 micron; 30 dB; BJT output stage; IF amplifier; SAW driver; SAW filter; SiGe; SiGe HBT process; circuit feedback; efficiency; linearity; receiver chain; small-signal DC current; Circuit simulation; Driver circuits; Feedback; Germanium silicon alloys; Impedance; Linearity; SAW filters; Silicon germanium; Surface acoustic waves; Voltage;
Conference_Titel :
Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on
Print_ISBN :
0-7803-7057-0
DOI :
10.1109/ICECS.2001.957746
