# 27-02-2024: Electronics 5#

Date: Tuesday, February 27 2024

Location: Chip

Time: 10:45 - 12:30

Question of the day

How to we characterize the nonlinear behavior of amplifiers?

## Knowledge Test#

Press the button(s) below to test your knowledge and understanding of the topics covered this lecture.

## Homework previous lecture#

SLiCAP files hearing loop system with determination of the output noise for different configurations: Lecture4.zip

See also the HTML report SLiCAP Hearing Loop Project -4-

## Amplifiers: modeling of nonideal behavior#

Amplifiers: modeling of power losses and energy storage

As all physical systems, amplifiers suffer from power losses and energy storage.

**Presentation**

The presentation "Amplifiers: power losses and energy storage" introduces high-level modeling techniques for such effects. It also briefly introduces a classification of amplifiers, based on the operation of the stage that drives the load.

**Presentation in parts**

Amplifiers: power losses and energy storage (parts)

**Study**

Chapter 2.4.4, 2.4.5

Amplifiers: voltage and current drive capability

The static and dynamic voltage and current drive capabilities of amplifiers are limited.

**Presentation**

The presentation "Amplifiers: voltage and current drive capability" gives description methods for these effects.

**Presentation in parts**

Amplifiers: voltage and current drive capability (parts)

**Video**

Amplifiers: voltage and current drive capability (5:37)

**Study**

Chapter 2.4.7, 2.4.8, 17.5, 17.7

Amplifiers: modeling of weakly nonlinear behavior

At signal levels below clipping, amplifiers will not behave perfectly linear.

**Presentation**

The presentation "Amplifiers: modeling of weakly nonlinear behavior" gives description methods for weakly nonlinear behavior.

**Presentation in parts**

The presentation "Amplifiers: modeling of weakly nonlinear behavior (parts)

**Video**

Amplifiers modeling of weakly nonlinear behavior (13:03)

**Study**

Chapter 17.5, 17.7

## Demonstration#

Amplifier noise behavior with open and shorted input terminals.

Dynamic nonlinear behavior of an amplifier.

## Homework#

Homework 3: Consider a hearing loop system with an instantaneous transadmittance transmitter amplifier and an integrating voltage receiver amplifier. The transadmittance amplifier drives the transmit coil with maximally \(\pm 30\) mA. Please answer the questions below using these specifications:

Determine the requirement for the voltage-drive capability of the transmitter amplifier.

Determine the required gain of the transmitter amplifier.

Determine a show-stopper value for the equivalent-input voltage noise spectral density of the transmitter amplifier (assume white noise).

Determine the required gain of the receiver amplifier.

Can the required signal-to-noise ratio be achieved if there is no magnetic interference from the environment?

Determine a show-stopper value for the equivalent-input voltage noise spectral density of the receiver amplifier (assume white noise).

Determine a show-stopper value for the equivalent-input current noise spectral density of the receiver amplifier (assume white noise).