Title :
A bipolar MMIC frequency tripler
Author :
Zheng, You ; Saavedra, Carlos E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Queen´´s Univ., Kingston, ON
Abstract :
A concept for an MMIC frequency tripler using SiGe HBT´s is proposed and verified in this paper. The main circuit of this tripler consists of a differential-pair frequency doubler followed by a single-balanced mixer that multiplies the doubler output with the fundamental frequency input to generate the triple-frequency output. The single-balanced mixer is an emitter-coupled differential pair and because its output is taken differentially by a differential output stage, the even harmonics are highly suppressed. An on-chip LC notch filter is further introduced in the output stage to suppress the fundamental, leaving the triple frequency dominating the output. The designed tripler can convert a 3-GHz input signal to a 9-GHz signal, with high suppressions of 28 dB, 22 dB, and 30 dB on the fundamental, the second, and 4th harmonics respectively.
Keywords :
MMIC frequency convertors; bipolar MMIC; frequency multipliers; heterojunction bipolar transistors; notch filters; silicon compounds; SiGe; SiGe HBT; bipolar MMIC frequency tripler; differential-pair frequency doubler; frequency 3 GHz; frequency 9 GHz; on-chip LC notch filter; single-balanced mixer; Circuits; Frequency conversion; Germanium silicon alloys; Impedance matching; MMICs; Power harmonic filters; Resistors; Signal design; Silicon germanium; Voltage;
Conference_Titel :
Devices, Circuits and Systems, 2008. ICCDCS 2008. 7th International Caribbean Conference on
Conference_Location :
Cancun
Print_ISBN :
978-1-4244-1956-2
Electronic_ISBN :
978-1-4244-1957-9
DOI :
10.1109/ICCDCS.2008.4542656
