Title :
On the SFDR performance of BJT RF circuits, an analytical approach
Author :
Helmy, Ahmed ; Sharaf, Khaled ; Ragai, Hani
Author_Institution :
Integrated Circuit Lab., Ain Shams Univ., Cairo, Egypt
Abstract :
A simple analytical approach for nonlinear distortion in RF bipolar circuits is utilized in the evaluation of spurious free dynamic range (SFDR) in BJT circuits. Simple closed-form expressions can predict the critical bias conditions corresponding to minimum or maximum SFDR. This method is applied to low noise amplifier (LNA) and single balanced mixer (SBM) circuits to study and optimize the dynamic range. The proposed method can predict the dynamic range with less than 10% error in most cases. The validity of this technique is examined by comparing the results of SPICE simulations to the calculations of the proposed method under different operating conditions
Keywords :
SPICE; UHF amplifiers; UHF integrated circuits; UHF mixers; VHF amplifiers; VHF circuits; bipolar integrated circuits; bipolar transistors; circuit simulation; integrated circuit modelling; integrated circuit noise; BJT RF circuits; BJT circuits; LNA circuit; RF bipolar circuits; SBM circuit; SFDR; SFDR performance; SPICE simulations; closed-form expressions; critical bias conditions; dynamic range optimization; dynamic range prediction error; low noise amplifier circuit; maximum SFDR; minimum SFDR; nonlinear distortion; operating conditions; single balanced mixer circuit; spurious free dynamic range; Bipolar transistor circuits; Circuit analysis; Circuit noise; Closed-form solution; Dynamic range; Low-noise amplifiers; Nonlinear distortion; Performance analysis; Radio frequency; Radiofrequency amplifiers;
Conference_Titel :
Microelectronics, 2000. ICM 2000. Proceedings of the 12th International Conference on
Conference_Location :
Tehran
Print_ISBN :
964-360-057-2
DOI :
10.1109/ICM.2000.916481
