8 BJT Basic Principle - Solution

8 BJT Basic - Tutorial BJT Basic Principle Solutions Fig 3.10 Solution(a r av = 0.9 V 0.7 V 8 mA V I Δ = Δ = 25 Ω(b Yes since 25 Ω is often

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Tutorial - BJT Basic Principle - Solutions Fig. 3.10 Solution (a) r av = 0.9 V 0.7 V 8 mA V I Δ- = Δ- = 25 Ω (b) Yes, since 25 Ω is often negligible compared to the other resistance levels of the network. Fig. 3.8 Solution (a) I C ≅ I E = 4.5 mA (b) I C ≅ I E = 4.5 mA (c) Negligible: change cannot be detected on this set of characteristics. (d) I C ≅ I E Fig. 3.7 Fig. 3.8 Fig. 3.10 Fig. 3.7 Fig. 3.8 Solution (a) Using Fig. 3.7 first, I E ≅ 7 mA Then Fig. 3.8 results in I C ≅ 7 mA (b) Using Fig. 3.8 first, I E ≅ 5 mA Then Fig. 3.7 results in V BE ≅ 0.78 V (c) Using Fig. 3.10(b) I E = 5 mA results in V BE ≅ 0.81 V (d) Using Fig. 3.10(c) I E = 5 mA results in V BE = 0.7 V (e) Yes, the difference in levels of V BE can be ignored for most applications if voltages of several volts are present in the network. Fig. 3.10 Solution (a) I C = α I E = (0.998)(4 mA) = 3.992 mA (b) I E = I C + I B ⇒ I C = I E- I B = 2.8 mA - 0.02 mA = 2.78 mA α dc = 2.78 mA 2.8 mA C E I I = =...
View Full Document

This note was uploaded on 01/11/2011 for the course EE 2106 taught by Professor Ytchow during the Spring '07 term at City University of Hong Kong.

Page1 / 12

8 BJT Basic - Tutorial BJT Basic Principle Solutions Fig 3.10 Solution(a r av = 0.9 V 0.7 V 8 mA V I Δ = Δ = 25 Ω(b Yes since 25 Ω is often

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online