Title :
A DC-6 GHz, 50 dB dynamic range, SiGe HBT true logarithmic amplifier
Author :
Holdenried, Chris D. ; Haslett, James W.
Author_Institution :
TRLabs., Calgary, Alta., Canada
Abstract :
In this work, a DC-6 GHz true logarithmic amplifier is presented. The amplifier uses a branch parallel summation architecture with four gain paths, and provides a piecewise approximate logarithmic response. The amplifier has 39 dB gain, 12.5 dB noise figure, 6.5 mV/dB logarithmic slope, and 50 dB logarithmic dynamic range. The amplifier uses Cherry-Hooper gain stages with emitter follower feedback. It also includes an on-chip automatic DC offset error reduction scheme. The circuit was fabricated in a 47 GHz SiGe HBT process. It draws 130 mA from a -3.3 V supply for a power consumption of 430 mW.
Keywords :
DC amplifiers; Ge-Si alloys; feedback amplifiers; heterojunction bipolar transistors; integrated circuit design; noise; power consumption; semiconductor materials; -3.3 V; 12.5 dB; 130 mA; 39 dB; 430 mW; 47 GHz; 50 dB; 6 GHz; Cherry-Hooper gain stages; SiGe; SiGe HBT; branch parallel summation architecture; emitter follower feedback; four gain path; logarithmic dynamic range; noise figure; on-chip automatic DC offset error reduction; power consumption; true logarithmic amplifier; Circuits; Dynamic range; Energy consumption; Feedback; Gain; Germanium silicon alloys; Heterojunction bipolar transistors; Noise figure; Power supplies; Silicon germanium;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328997
