(b) A transistor constant current source is shown in Fig. 7. Analyse the circuit to find an expression for the DC current IL and show that it is independent of the load RL and the power supply Vcc. Assume the Zener is modelled by just its knee voltage Vzк (that is, rz = 0), and the transistor is modelled by VBE (that is, r = 0) and 3. R RL IL D RE Vcc Figure 7: Transistor-based constant current source. (c) Use your answer to part (b) to design a 20 mA current source, given Vcc : = 12 V and ẞ> 100. Find the values of R, RE, and VZK, together with the minimum power ratings of D and RE. Assume D requires 10 mA to maintain reverse breakdown.

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(b) A transistor constant current source is shown in Fig. 7. Analyse the circuit to find an
expression for the DC current IL and show that it is independent of the load RL and the
power supply Vcc.
Assume the Zener is modelled by just its knee voltage Vzк (that is, rz = 0), and the transistor
is modelled by VBE (that is, r = 0) and 3.
R
RL
IL
D
RE
Vcc
Figure 7: Transistor-based constant current source.
(c) Use your answer to part (b) to design a 20 mA current source, given Vcc : = 12 V and ẞ> 100.
Find the values of R, RE, and VZK, together with the minimum power ratings of D and RE.
Assume D requires 10 mA to maintain reverse breakdown.
Transcribed Image Text:(b) A transistor constant current source is shown in Fig. 7. Analyse the circuit to find an expression for the DC current IL and show that it is independent of the load RL and the power supply Vcc. Assume the Zener is modelled by just its knee voltage Vzк (that is, rz = 0), and the transistor is modelled by VBE (that is, r = 0) and 3. R RL IL D RE Vcc Figure 7: Transistor-based constant current source. (c) Use your answer to part (b) to design a 20 mA current source, given Vcc : = 12 V and ẞ> 100. Find the values of R, RE, and VZK, together with the minimum power ratings of D and RE. Assume D requires 10 mA to maintain reverse breakdown.
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