Known: 𝑅1 = 50 𝑘Ω, 𝑅2 = 10 𝑘Ω, 𝑅𝐶 = 600 Ω, 𝑅𝐸 = 400 Ω, 𝑉𝐵𝐸 = 0.81306 V, 𝐼𝐵 = 4.48756e − 005A, 𝐼2 =
0.000262604 A, and 𝑉1 = 18 V. D1 has the break-down VZ = 16V and forward VD = 0.8V, VCE sat=0.4V
In green, known values, in red, unknown values.
Find:
1.
DC analysis: find the collector-emitter voltage, 𝑉𝐶𝐸 , and the collector current, 𝐼𝐶
2.
DC sweep:
The following graph is the simulation result of the VCE (on Y axis) vs. V1 (on X axis). That is, for V1 varying
from -5V to +25V, the graph shows the variation of the VCE.
Identify on the graph the three states of the transistor and the three states of the diode: for example, for the
A-B interval, the diode is in ??? mode and the transistor in ??? mode. The VCE value is approximately constant
at a value of ???
TIP: look into the collector current variation over the V 1 variation.
Simulate
Simulate the two requirements above using the standard npn transistor, as indicated below.
Note: use the standard npn transistor (see below)
Results comparison
Compare the analytical results vs. the simulated ones and comment.