4.5 Exercises

Analysis Problems

1. For the amplifier of Figure 4.5.1 , determine πππ and π΄π£ . πππ = 20 mV, πΌπ·ππ = 10 mA, ππΊπ(πππ) = β2 V, ππ·π· = 20 V, ππΊ = 750 k Ξ© , ππ· = 2 k Ξ© , ππΏ = 4 k Ξ© , ππ = 1 k Ξ© , πππ = 200 Ξ© .
2. For the amplifier of Figure 4.5.1 , determine πππ and πππ’π‘ . πππ = 25 mV, πΌπ·ππ = 15 mA, ππΊπ(πππ) = β2 V, ππ·π· = 22 V, ππΊ = 330 k Ξ© , ππ· = 2 k Ξ© , ππΏ = 6 k Ξ© , ππ = 510 Ξ© , πππ = 220 Ξ© .
3. For the circuit of Figure 4.5.2 , determine πππ and π΄π£ . πππ = 10 mV, πΌπ·ππ = 12 mA, ππΊπ(πππ) = β2.5 V, ππ·π· = 26 V, ππΊ = 510 k Ξ© , ππ· = 1.2 k Ξ© , ππΏ = 25 k Ξ© .
4. For the circuit of Figure 4.5.2 , determine πππ and πππ’π‘ . πππ = 25 mV, πΌπ·ππ = 15 mA, ππΊπ(πππ) = β1.5 V, ππ·π· = 24 V, ππΊ = 820 k Ξ© , ππ· = 1 k Ξ© , ππΏ = 12 k Ξ© .
5. For the circuit of Figure 4.5.3 , determine πππ and πππ’π‘ . πππ= 25 mV, πΌπ·ππ = 8 mA, ππΊπ(πππ) = β3.5 V, ππ·π· = 24 V, π1 = 1 M Ξ© , π2 = 100 k Ξ© , ππ· = 800 Ξ© , ππΏ = 10 k Ξ© .
6. For the circuit of Figure 4.5.3 , determine πππ and π΄π£ . πππ = 10 mV, πΌπ·ππ = 6 mA, ππΊπ(πππ) = β4 V, ππ·π· = 26 V, π1 = 2 M Ξ© , π2 = 120 k Ξ© , ππ· = 1.2 k Ξ© , ππΏ = 15 k Ξ© .
7. For the circuit of Figure 4.5.4 , determine πππ and πππ’π‘ . πππ = 20 mV, πΌπ·(ππ) = 6 mA at ππ·π(ππ) = 3 V, ππΊπ(π‘β) = 2.5 V, ππ·π· = 34 V, π1 = 1 M Ξ© , π2 = 100 k Ξ© , ππ· = 1 k Ξ© , ππΏ = 10 k Ξ© .
8. For the circuit of Figure 4.5.4 , determine πππ and π΄π£ . πππ = 15 mV, πΌπ·(ππ) = 10 mA at ππ·π(ππ) = 4 V, ππΊπ(π‘β) = 2 V, ππ·π· = 30 V, π1 = 2 M Ξ© , π2 = 180 k Ξ© , ππ· = 1.2 k Ξ© , ππΏ = 15 k Ξ© .
9. For the circuit of Figure 4.5.5 , determine πππ and πππ’π‘ . πππ= 200 mV, πΌπ·ππ = 15 mA, ππΊπ(πππ) = β3 V, ππ·π· = 15 V, ππΊ = 910 k Ξ© , ππΏ = 10 k Ξ© , ππ = 330 Ξ© .
10. For the circuit of Figure 4.5.5 , determine πππ and πππ’π‘ . πππ = 200 mV, πΌπ·ππ = 20 mA, ππΊπ(πππ) = β2 V, ππ·π· = 12 V, ππΊ = 1 M Ξ© , ππΏ = 1.8 k Ξ© , ππ = 220 Ξ© .
11. For the circuit of Figure 4.5.6 , determine πππ and π΄π£ . πΌπ·ππ = 18 mA, ππΊπ(πππ) = β2 V, ππ·π· = 12 V, πππ = β4 V, ππΊ = 680 k Ξ© , ππΏ = 10 k Ξ© , ππ = 1 k Ξ© .
12. For the circuit of Figure 4.5.6 , determine πππ and π΄π£. πΌπ·ππ = 20 mA, ππΊπ(πππ) = β2 V, ππ·π· = 10 V, πππ = β6 V, ππΊ = 2.2 M Ξ© , ππΏ = 5 k Ξ© , ππ = 510 Ξ© .

Design Problems

1. Following the circuit of Figure 4.5.1 , design an amplifier with a gain of at least 5 and an input impedance of at least 500 k Ξ© . ππΏ = 10 k Ξ© . The MOSFET has the following parameters: ππΊπ(πππ) = β2 V, πΌπ·ππ = 25 mA. Try to use standard resistor values.
2. Using the circuit of Figure 4.5.5 , design a follower with a gain of at least .75 and an input impedance of at least 1 M Ξ© . ππΏ = 2 k Ξ© . The MOSFET has the following parameters: ππΊπ(πππ) = β1.5 V, πΌπ·ππ = 40 mA. Try to use standard resistor values.

Challenge Problems

1. For the circuit of Figure 4.5.7 , determine πππ and π΄π£ . πΌπ·ππ = 15 mA, ππΊπ(πππ) = β2 V.
2. For the circuit of Figure 4.5.8 , determine πππ and π΄π£ . πΌπ·ππ = 12 mA, ππΊπ(πππ) = β1.5 V.

Computer Simulation Problems

1. Utili πππ g manufacturer’s data sheets, find devices with the following specifications (typical) and verify them using the measurement techniques presented in the prior chapter.
1. Device 1: ππΊπ(πππ) = β2 V, πΌπ·ππ = 25 mA.
2. Device 2: ππΊπ(πππ) = β1.5 V, πΌπ·ππ = 40 mA.
2. Using the device model from the preceding problem, verify the design of Problem 4.
3. Using the device model from Problem 17, verify the design of Problem 14.