Chapter 4: Components and Circuits

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Section 4.3: Basic Components

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Resistors

The change in resistance is a function of the resistor's temperature coefficient
Inductive resistors can affect RF circuits and change signals (contain metal winding)
Use non-inductive resistors in RF circuits

Inductors:

Double lines in symbol mean metal core
Inductors store an amount of magnetic energy, from the current flowing through it
Higher inductance means more magnetic energy stored
Higher permeability of core increases inductance
Mutual inductance - current generated from a shared magnetic core
To avoid mutual inductance, use torroidal inductors, or place inductors at right angles
Inductor material can be optimized for particular frequencies

Capacitors:

Basic structure: two conductors separated by a dielectric, which stores electrical energy while preventing DC current flow
The closer the surfaces, the larger the SA, the larger the dielectric energy storage, the higher the capacitance
Rolled up capacitors have significant parasitic inductance
Ceramic capacitors are more common at higher frequencies
Electrolytic capacitors use electrolyte gel/paste, pack higher capacitance into smaller volume
Polarized capacitors - current can only flow in 1 direction
Voltage rating of capacitors is the voltage above which the dielectric insulation will break down
Blocking capacitors l- block DC signals, but not AC signals
Bypass capacitors - low impedance path across high impedance circuit
Filter capacitors - smooth out rectified AC into DC power
Suppressor capacitors - absorb transient voltage spikes
Tuning capacitors - varying resonant circuit frequencies

Components in series/parallel: