Title :
A small-signal equivalent circuit model for heterostructure acoustic charge transport devices
Author :
Kenney, J. Stevenson ; Hunt, William D.
Author_Institution :
Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
A linear time-invariant small-signal circuit model for heterostructure acoustic charge transport (HACT) devices is presented. This model includes noise sources for the various physical processes that occur within the device. The linear circuit elements are derived from variations about the quiescent operating point of the device. Expressions for the noise sources are derived in terms of operating conditions, device architecture, and material parameters. An expression for the midband noise figure is presented. It agrees within 10% of measured data for a 160 tap HACT device, and within 5% of published data on similar 20, 160, and 320 tap devices. The circuit model frequency response is simulated using Libra. Model predictions show good agreement with measured HACT device performance
Keywords :
acoustic charge transport devices; equivalent circuits; HACT device; Libra; circuit model frequency response; device architecture; heterostructure acoustic charge transport devices; linear circuit elements; material parameters; midband noise figure; noise sources; operating conditions; physical processes; quiescent operating point; small-signal equivalent circuit model; Acoustic devices; Acoustic noise; Circuit noise; Circuit simulation; Equivalent circuits; Linear circuits; Noise figure; Predictive models; Semiconductor process modeling; Voltage;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.276033
