Anjan Chakravorty

A compact model for silicon germanium heterojunction bipolar transistor based on transient integral charge-control (TICC) relations is presented. Partitioning factors are extracted from the numerically simulated data. A thorough analysis based on the transient and AC results has been carried out for checking the suitability of the model. No convergence problem is observed in transient simulation. The model shows acceptable accuracy in the phase behavior from low frequency up to transit frequency.

A physics based model for the non-quasi-static (NQS) effects occurring in heterojunction bipolar transistors (HBTs) is presented. Following classical transistor theory, partitioned charge based (PCB) approach is extended to additionally model small-signal frequency-dependent (trans-) conductances. A new large-signal model is implemented in Verilog-A, and is tested for small-signal behavior. Results are compared with numerical device simulation, and its improvement is checked against the results obtained from PCB approach and widely used 2nd order LCR sub-circuit. ©2009 IEEE.