# Electricity

• Cours (CM) 12h
• Cours intégrés (CI) -
• Travaux dirigés (TD) 12h
• Travaux pratiques (TP) -
• Travail étudiant (TE) 36h

Langue de l'enseignement : Anglais

## Description du contenu de l'enseignement

For quadrupole part: voltage, current and power amplifiers. Input and output impedances, amplification factor. Impedance adapter amplifier (follower amplifier).Decibels, voltage and power gain factor. Application to an audio amplifier chain connected between a vinyl disc reader and a loudspeaker.
For complex modeling part: First order R,C circuits : harmonic response (both trigonometric and complex form), magnitude and phase. Transfer function. Complex impedance. Circuit computation in complex form. Relationships between complex and temporal forms. Low-pass and high-pass filters.
Bode diagram: computation, measure and utilities. Second order filters. Band-pass filters, Cut-off frequency, damping factor. Three applications: RIAA filter, audio power amplifier model extracted from datasheet, 2 ways loudspeaker filters. Functional simulation with xcos(scilab).

## Compétences à acquérir

At the end of this subject the student will be able to: For complex modeling, use the superposition theorem in order to compute a voltage or current in case of a single source which included the sum of different sinusoidal components (amplitudes, frequencies) or different sources; computes modulus and argument as a ω function from a given a transfer function; compute the temporal expression of the output from a given a transfer function and the temporal sinusoidal input expression; compute the output for a sum of sinusoidal inputs at different frequencies (superposition theorem); compute and draw the asymptotic gain and phase Bode diagrams from the transfer function equation; draw the look of the real Bode diagrams started with asymptotic drawing; compute the remarkable points of a Bode diagram; compute transfer function for a cascade of functional blocks or and additive one; use the Bode diagram to compute the temporal response to an additive combinaison of sinusoidal inputs; write and recognize the canonical transfer function of the second order filters (low,high, band-pass); find real poles of a second order denominator (place them on a Bode diagram), find frequency and gain for max gain point of the second order low-passfilter; compute the bandwidth as a function of Q and ω0 (band-pass); compute the slope on the gain asymptotic diagrams, limits on phase diagram For quadrupoles, draw or recognize a quadrupole model and identify its components ; compute (simple cases) and measure the different elements value of a quadrupole (DC and complex mode) ; compute voltage, current and power amplifications ; use of dB, dBv and dBmV ; understand and recognize an impedance adaptation problem ; Understand the model of an ideal follower amplifier ; understand the filter block representation ; transform a component circuit in a filter block representation.

## Pré-requis obligatoires

Electrokinetics, Ohm's law, voltage divider, Thevenin's theorem, ... are supposed to be known.

## Contact

Faculté de physique et ingénierie

3-5, rue de l'Université
67084 STRASBOURG CEDEX

Formulaire de contact

### Intervenants

Ali Huseyn Dovlatov

Gulnaz Gahramaova

Shamil Gudavasov

Robin Merine