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 1ms  - and a very short 1μs  -pulse mode2 are compared for NBTI in Fig. 5.11. Not surprising, the extracted values using the 1ms  -pulses are smoother than those using the 1 μs  -pulses. This is due to the best signal-to-noise ratio of all four performed FPM (NBTI/PBTI using 1μs  /1ms  ), previously depicted in Fig. 5.5 and Fig. 5.6.


PIC


Figure 5.11: Fast pulsed ID (VG )  -measurements after [2451]. The comparison between longer and shorter pulse times reveals no surprise, as the longer 1ms  -NBTI-pulse gives the best match to the manually extracted one.