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1. Circuit Terminology. CIRCUITS by Ulaby &amp; Maharbiz. Overview. Chapter 1: Circuit Terminology. Electronics Devices – active vs. passive Circuits Systems. Cell-Phone Architecture. Units, Multiples, Notation. Tech Brief 1: Micro- and Nanotechnology.

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### 1. Circuit Terminology

CIRCUITS by Ulaby & Maharbiz

Chapter 1: Circuit Terminology
• Electronics
• Devices – active vs. passive
• Circuits
• Systems
Charge & Current
• Unit of charge = coulomb
Electron Drift

Response time = 0.2 microsecond

Actual travel time = 10 days!!

Example 1-1: Charge Transfer
• Given:

Solution:

Determine: (a) q(t)

(b)

Reference/Ground
• Choose reference point for potential
• Assign potential at reference = 0, called ground
• Now all potentials are relative to ground terminal
Measuring Voltage & Current
• Voltmeter: measures voltage without drawing current
• Ammeter: measures current without dropping voltage
Open Circuit & Short Circuit
• Open circuit: no path for current flow (R = )
• Short circuit: no voltage drop (R = 0)
Power

Rate of expending or absorbing energy

Energy conservation

Units: watts

One watt = power rate of one joule of work per second. 1 W = 1 A x 1 V

Example 1-4: Energy Consumption
• Given:Resistor consuming 20 W before switch turned off at t = 0.

Also

• Determine: Total energy consumed by resistor after t = 0.
• Solution:

(before t = 0)

I-V for Sources
• Current/voltage fixed for independent sources
• What does a non-ideal source look like?
• Dependent sources vary with reference voltage/current
• What are units for slope?
Example 1-5: Dependent Source
• Given:

Source is CCVS

Determine:

Solution:

Tech Brief 2: Moore’s Law
• Challenges to Continuation of Moore’s Law
• Heat dissipation
• Size (approaching atomic dimensions)