The question is Find the Q-points for the diodes in the circuit using the ideal diode model: enter image description here

The book solution is: enter image description here

However, per my analysis both diodes are conducting because if as assumed that D1 is cut off the voltage at D1 cathode side would be -3.92 V which is less than the voltage for the same diode anode side! Thus, since VD1 (anode side) = 0 - VD1 (cathode side) = -3.92

0-(-3.92) = 3.92 D1 will conduct. Am I right?

The Book is:

Microelectronic circuit design / Richard C. Jaeger, Travis N. Blalock. — 4th ed. ISBN 978-0-07-338045-2

  • 1
    \$\begingroup\$ Determine which edition your book is and download an errata for it, and look up if the correct answer is there. \$\endgroup\$
    – Justme
    Commented Jan 13, 2021 at 5:43
  • 1
    \$\begingroup\$ I'd certainly be looking at getting a new book. \$\endgroup\$
    – Andy aka
    Commented Jan 13, 2021 at 9:54
  • \$\begingroup\$ Have all these questions been from the same book? \$\endgroup\$
    – user16324
    Commented Jan 13, 2021 at 13:08

1 Answer 1


You are correct, both diodes will conduct.


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