Title :
A silicon monolithic spiral transmission line balun with symmetrical design
Author :
Yoon, Yeong J. ; Lu, Yicheng ; Frye, Robert C. ; Smith, Peter R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Rutgers Univ., Piscataway, NJ, USA
fDate :
4/1/1999 12:00:00 AM
Abstract :
In this work, a spiral transmission line balun has been fabricated on a high resistivity silicon substrate. The Marchand-type balun has been designed to have the same physical common ground points for the output transmission lines, which eliminates imbalance due to potential difference at the ground. Return loss is better than 17 dB in the frequency band of 1.6-4.1 GHz, especially 39 dB around 1.9 GHz. The amplitude imbalance is less than 0.3 dB throughout the bandwidth. The phase departure from 180/spl deg/ is less than 20 over the frequency range of 1.6-2.6 GHz. The balun is suitable for MMIC application.
Keywords :
MMIC mixers; baluns; elemental semiconductors; silicon; 1.6 to 4.1 GHz; MMIC application; Marchand-type balun; Si; amplitude imbalance; output transmission lines; phase departure; physical common ground points; potential difference; return loss; spiral transmission line balun; symmetrical design; Conductivity; Frequency; Impedance matching; Inductors; MMICs; Mutual coupling; Silicon; Spirals; Transformers; Transmission lines;
Journal_Title :
Electron Device Letters, IEEE
