Linearity characteristics of GaAs HBTs and the influence of collector design
| Autor: | Jonathan B. Scott, A. Cognata, M. Iwamoto, D.C. D'Avanzo, T.S. Low, C.P. Hutchinson, L.H. Camnitz, Peter M. Asbeck, Xiaohui Qin |
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| Rok vydání: | 2000 |
| Předmět: |
Third-order intercept point
Radiation Materials science business.industry Heterojunction bipolar transistor Transconductance Bipolar junction transistor Linearity Condensed Matter Physics Capacitance Electronic engineering Optoelectronics Electrical and Electronic Engineering business Intermodulation Voltage |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 48:2377-2388 |
| ISSN: | 0018-9480 |
| Popis: | The linearity characteristics of GaAs heterojunction bipolar transistors (HBTs) are studied through measurement and analysis. Third-order intermodulation distortion behavior of HBTs is examined on devices with various epilayer designs and at various bias points, loads, and frequencies. Calculations from an analytical model reveal a strong bias and load dependence of third-order intercept point (IP3) on the nonlinearities from transconductance and the voltage dependence of base-collector capacitance. However, a simple model is not able to predict the fine details of IP3 with bias. A large-signal HBT model with an accurate description of the base-collector charge is shown to account for the measured trends. The base-collector charge function accounts for the modulation of base-collector capacitance with current, electron velocity modulation, and the Kirk effect (base pushout) for GaAs-based HBTs. A detailed study of the influence of collector design on linearity is also presented. |
| Databáze: | OpenAIRE |
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