The transistor shown in Fig. 2.74 is connected in the circuit shown in Fig. 2.75. The gate is grounded, the substrate is connected to ˆ’1.5 V, and the drain is open circuited. An ideal current source is tied to the source, and this source has a value of zero for t < 0 and 10 _A for t > 0. The source and drain are at an initial voltage of+1.5Vat t = 0. Sketch the voltage at the source and drain from t = 0 until the drain voltage reachesˆ’1.5V. For simplicity, assume that the source substrate and drain-substrate capacitances are constant at their zero-bias values. Assume the transistor has a threshold voltage of 0.6 V.

Fig. 2.74

Fig. 2.75

Transcribed Image Text:

1 μπ - 1 um 1 μ um 10 μm Source: Drain Gate i(t) 110 μΑ -1.5 V