19-02-2024: Electronics 3#
Date: Monday, February 19 2024
Location: Boole
Time: 10:45 - 12:30
Question of the day
Which amplifier types do we distinguish and which do we need for the hearing loop system?
Knowledge Test#
Press the button(s) below to test your knowledge and understanding of the topics covered this lecture.
Amplifiers: types and modeling of ideal behavior#
Amplifiers: types
Electronic amplifiers are often used to interface with sensors and actuators. The nature of the input signal of the sensor or the output signal of an actuator, and the pysical operating mechanism of such transducers, tell us which electrical quantity (short-circuit current or open-circuit voltage) needs to be selected at the input port or at the output port of the amplifier.
Presentation
The presentation "Amplifier Types" introduces nine different unilateral amplifier types, based on the sensing and the driving properties of the input port and the output port, respectively.
Presentation in parts
Video
Study
Chapter 2.2
Amplifiers: port isolation configurations
The functional behavior of the amplifier has been modeled while omitting the power port.
Presentation
The presentation "Amplifiers: port isolation configurations" gives types of amplifiers, based on intended connections between the amplifier ports.
Presentation in parts
Amplifiers: port isolation configurations (parts)
Video
EE3C11 lecture 3 Amplifier Port Isolation
Study
Chapter 2.2.2, 2.2.3
Amplifiers: modeling of the ideal behavior
Conceptually, amplifiers are intended to behave as linear, time-invariant systems. Although the supply of power is essential for their operation, the power port can be omitted when considering its functional operation only.
Presentation
In the presentation "Amplifiers: modeling ideal behavior" we will elucidate the use of the transmission-1 two-port representation for modeling of the functional (conceptual, or ideal) behavior of amplifiers. The use of these parameters results in clear design conclusions for making the source-to-load transfer independent of the source impedance and the load impedance. This is of particular interest if the voltage-current relation of the source or the load has a (partly) unpredictable character.
Presentation in parts
Amplifiers: modeling ideal behavior (parts)
Videos
Amplifiers characterization and modeling of ideal behavior Two-port Model (12:09)
Amplifiers characterization and modeling of ideal behavior Port Impedances (4:19)
Study
Chapter 2.3
Amplifiers: determination of the T1 matrix parameters
A two-port model that is very suited for designing amplifiers is the T1 matrix. This representation uses a so-called anti-causal description in which the input voltage and the input current are taken as dependent variables, while the output port quantities are taken as independent variables.
Presentation
The presentation "Determination of the T1 matrix parameters" shows in which way the T1 matrix parameters can be obtained from circuit analysis done by hand or with the aid of SLiCAP.
Videos
EE3C11 lecture 3 Determination T1 matrix SLiCAP
Study
Chapter 2.3
Downloads
Please download the archive ABCD-test.zip with Jupyter notebook and the python script.
Downloads#
Homework#
Homework 1: design high-level architectures for the hearing loop system. These architectures comprise antennas and amplifiers. For each amplifier, give the idealized values of their T1 matrix parameters.
For each architecture, discuss the influences of the inductance, the series resistance, and the parallel capacitance of the hearing loop antennas on the transfer.