Mohamed, Nabil Mohamed Design of Analog Integrated circuits for Hearing Aid Devices

salamiblackElectronics - Devices

Nov 27, 2013 (3 years and 6 months ago)

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Thesis (M.SC)


Minia University.

Faculty of Engineering.

Mechanical Engineering Department

:فلؤملا

Mohamed, Nabil Mohamed
.

:ناونعلا

Design of Analog Integrated circuits for Hearing Aid Devices

/

نيفرشملا

:

Sup
ervised by Farouk Abdel
-
Nasser Algelada, Hamid Abdel
-
Ghaffar Summari, Hisham Fathi
Hamed
.

خيرات
:رشنلا

3002
.

:صخلم

A great number of
people have great difficulty in understanding speech in surrounding with
background noise. It is estimated that in the industrialized countries about 10% suffer from
heating impairments
.


In the past, various devices have been invented to assist those peop
le, Until 1900, they were
shaped as tapered horn, But the first commercially available electrical hearing aid device were
introduce initially, they only consists of a microphone, a telephone and bulky battery
.


But the majok turning point aime when the tra
nsistor was invented, since then the hearing aid
devices become smaller, and now it is possible to implement the whole system on one or two
chips using the VLSI technology. Generally the Hearing Aid systems consists of three main units
.


1
-

The preamprefir
e
.


3
-

The AGC
.


2
-
The filter
.


As the technology advances, the size of the circuit decrease which allow us to decrease the supply
voltage, which help us in
:


1
-

Minimize the battery size and hence minimizing the whole system
.

3
-
reduce the power consumptio
n
.


In this work our objective is to design a filter for use in hearing aids devices that can work in low
voltage, ultra low power environment
.


We will use a current mode approach to overcome the problem caused by the reduction in the
voltage swing as we
decrease the supply voltage
.

:عوضوملا

Design
.

/

Integrated circuits
.