Measured (symbol) (a) cutoff frequency and (b) impulse response of a typical HBT versus that simulated by using the Agilent (dashed curve) and modified (solid curve) HBT model. In (a), = 1, 2, 3, and 4 V top down. In (b), the input pulse width and amplitude are 0.2 nanosecond and 1.45 V, respectively. = 0. Artificial delays between impulses are added for clarity.
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