Difference between revisions of "Signal Sources and Amplifiers"
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There are 6 types or classes of electical signal sources which occur in various experimental situations. It is important to understand the characteristcs of these signal sources in order that they can be matched to the correct amplifier/recording system without degrading the contents of the signal source. | There are 6 types or classes of electical signal sources which occur in various experimental situations. It is important to understand the characteristcs of these signal sources in order that they can be matched to the correct amplifier/recording system without degrading the contents of the signal source. | ||
| + | PLEASE NOTE: In discussing the characteristics of signal sources reference will be made to "Source Impedance" which in its most general form consists of a combination of 3 electrical terms: Resistance,Inductance and Capacitance. | ||
| + | In most cases one of these terms will predominate, most commonly resistance. So when the term "Source Resistance" is used it implies that the impedance is mainly resistive in nature. At DC or low frequencies Impedance is mainly resistive and the other term, capacitance and inductance only come into play at higher frequencies. [] | ||
| + | http://en.wikipedia.org/wiki/Electrical_impedance | ||
These 6 classes are listed and discussed below: | These 6 classes are listed and discussed below: | ||
Revision as of 17:13, 13 September 2013
Contents
Introduction
In order to record an experimental signal with high fidelity 3 issues need to be considered.
- Type of Signal to be measured
- Characteristics of the signal sources
- Type of Amplifier used to record the signal
Signal Types
There are 6 types or classes of electical signal sources which occur in various experimental situations. It is important to understand the characteristcs of these signal sources in order that they can be matched to the correct amplifier/recording system without degrading the contents of the signal source.
PLEASE NOTE: In discussing the characteristics of signal sources reference will be made to "Source Impedance" which in its most general form consists of a combination of 3 electrical terms: Resistance,Inductance and Capacitance. In most cases one of these terms will predominate, most commonly resistance. So when the term "Source Resistance" is used it implies that the impedance is mainly resistive in nature. At DC or low frequencies Impedance is mainly resistive and the other term, capacitance and inductance only come into play at higher frequencies. [] http://en.wikipedia.org/wiki/Electrical_impedance These 6 classes are listed and discussed below:
Single ended - Floating
This is a brief description of a Single ended - Floating electrode. It works like this... Blah blah blah.
Single ended - Grounded
blah blah blah
Single ended - Grounded with Common mode voltage
blah blah blah
Balanced - Floating
blah blah blah
Balanced - Grounded
blah blah blah
Balanced - Grounded with Common mode voltage
blah blah blah
Source Characteristics
- Source Impedance
- Source Voltage
- Source Frequency content
Amplifier types
- Single ended - Grounded
- Single ended - Isolated
- Balanced - Grounded
- Balanced - Isolated
