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Resonant Electronic Circuits
Peter Auer
Series and parallel resonant circuits
Source: allaboutcircuits,com
Capacitor
Inductor
Resonant Electronic Circuits
Peter Auer
Inductive and capacitive reactances
Source: electronics-tutorials
XC: hyperbolic decrease
XL: linear increase
Glossary:
reactance – Blindwiderstand
resonant frequency – Resonanzfrequenz
phasor - Zeiger
resonant frequency
fo
Soruce: HyperPhysics
Resonant Electronic Circuits
Peter Auer
Impedance
Source: HyperPhysics
Loss (Verlust)
Resonant Electronic Circuits
Peter Auer
Circuit quality and bandwidth
Series resonance
Glossary:
quality factor – Gütefaktor
bandwidth - Bandbreite
Quality factor
High Q – narrow bandwidth
Low Q – wide bandwidth
Resonant Electronic Circuits
Peter Auer
Source: HyperPhysics
Quality factor versus bandwidth in a parallel resonant circuit
Source: wikipedia
Bandwidth
Resonant Electronic Circuits
Peter Auer
Applications:
• Radio receiver and transmitter (amplifier, filter)
• RFID tags (Radio Frequency Identification)
• Medical therapy equipment
Resonant Electronic Circuits
Peter Auer
CLIL-tasks:
• Explain the function of a resonant circuit to a fellow student
• Explain the impedance versus frequency graphs
• Give an instruction for the lab experiment shown in the video
• Discuss the effect of the Q-factor on the bandwidth
Resonant Electronic Circuits
Peter Auer
• Gap filling text
A resonant circuit consists of a …………. and an ………………….
The frequency where XL and XC are equal in magnitude is called …………………
At the resonant frequency the impedance of a series resonant circuit is ………….
Bandwidth is calculated: ……………….. divided by …………….
The resonant frequency is determined by values of …………. and ………………
Resonant Electronic Circuits
Peter Auer
• Matching exercise
Find a matching pair of expressions:
minimal impedance narrow bandwidth
capacitive reactance series resonance
low Q parallel resonance
maximal impedance increase
inductive reactance wide bandwidth
high Q decrease
