5.2.3 Varying Pulse Rise/Fall Times

An important point has not yet been discussed so far. When investigating short pulsed BTI measurements such as FPM, the time-resolution of the measurement equipment is of utmost importance. To determine the limits of the used setup, a short - and a very short -pulse mode² are compared for NBTI in Fig. 5.11. Not surprising, the extracted values using the -pulses are smoother than those using the -pulses. This is due to the best signal-to-noise ratio of all four performed FPM (NBTI/PBTI using /), previously depicted in Fig. 5.5 and Fig. 5.6.

Figure 5.11: Fast pulsed -measurements after [24, 51]. The comparison between longer and shorter pulse times reveals no surprise, as the longer -NBTI-pulse gives the best match to the manually extracted one.