Difference between revisions of "Signal Sources and Amplifiers"
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In order to record an experimental signal with high fidelity 3 issues need to be considered. | In order to record an experimental signal with high fidelity 3 issues need to be considered. | ||
| − | * | + | *Signal Sources to be measured |
*Characteristics of the signal sources | *Characteristics of the signal sources | ||
*Type of Amplifier used to record the signal | *Type of Amplifier used to record the signal | ||
| − | ==Signal | + | ==Signal Sources== |
| − | There are 4 types or classes of electical signal sources which occur in various experimental situations. | + | There are 4 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 accuracy of the measurement. |
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 elements: Resistance,Inductance and Capacitance. | 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 elements: Resistance,Inductance and Capacitance. | ||
In most cases one of these elements will predominate, most commonly resistance. So when the term "Source Resistance" is used it implies that the impedance of the source is mainly resistive in nature. | In most cases one of these elements will predominate, most commonly resistance. So when the term "Source Resistance" is used it implies that the impedance of the source is mainly resistive in nature. | ||
| − | At DC or low frequencies | + | At DC or low frequencies source impedance is mainly resistive and the other elements, capacitance and inductance only come into play at higher frequencies. |
| + | |||
http://en.wikipedia.org/wiki/Electrical_impedance | http://en.wikipedia.org/wiki/Electrical_impedance | ||
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===Balanced - Grounded with Common mode voltage=== | ===Balanced - Grounded with Common mode voltage=== | ||
blah blah blah | blah blah blah | ||
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Revision as of 17:41, 13 September 2013
Contents
Introduction
In order to record an experimental signal with high fidelity 3 issues need to be considered.
- Signal Sources to be measured
- Characteristics of the signal sources
- Type of Amplifier used to record the signal
Signal Sources
There are 4 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 accuracy of the measurement.
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 elements: Resistance,Inductance and Capacitance. In most cases one of these elements will predominate, most commonly resistance. So when the term "Source Resistance" is used it implies that the impedance of the source is mainly resistive in nature. At DC or low frequencies source impedance is mainly resistive and the other elements, capacitance and inductance only come into play at higher frequencies.
http://en.wikipedia.org/wiki/Electrical_impedance
These 4 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 with Common mode voltage
blah blah blah
Balanced - Floating
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
