Ten Essential Skills for Electrical Engineers

ANSWERS TO PROBLEMS

CHAPTER 1

1.1 R1 = 2941 Ω, R2 = 1515 Ω

1.2 R1 = 930 Ω, R2 = 1400 Ω

1.3 R1 = 85.24 kΩ, R2 = 41.84 kΩ, R3 = 23.43 kΩ

1.4 For a current source, the current will remain constant regardless of the voltage so Z = dV/di = ∞. The DC current source should be represented as an open circuit.

1.5 874.8 Ω

1.6 (a) Attenuation: VO/VIN, 1/3

(b) DC bias, 2.5 V

(c) Load impedance, 27 kΩ

(d) Source impedance, 6 kΩ

1.7 115 mA

1.8 624 mW

CHAPTER 2

2.1 PD = 16 W

2.2 TJ = 196°C

2.3 The junction temperature would rise to 193°C which would compromise the MTBF of the transistor.

2.4 The thermal resistance must be less than 5.87 °C/W so about 130 FPM is required.

2.5 2 J/°C

CHAPTER 3

3.1 Transfer functions for a through d are

3.2 The transfer function is

where

and

The frequency response is

Frequency response plot for Problem 3.2.

3.3 The updated network is

Updated network for Problem 3.3.

3.4 The transfer function is

where the networks from left to right are A, B, and C.

The ...