Chapter 05A - Signal Modifier

Chapter 05A - Signal Modifier - CHAPTER V SIGNAL MODIFIER...

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CHAPTER V SIGNAL MODIFIER
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SIGNAL MODIFIER he output signal from a transducer ± The output signal from a transducer usually need to be modified through signal modifier (conditioner). ± Several types of signal modifier commonly used in the industry are: lifi (O ) ± Amplifier (Op-Amp) ± Analog to Digital Converter (ADC) igital to Analog Converter (DAC) ± Digital to Analog Converter (DAC) ± Frequency Filter oise Filter Dr. Abdirahman CHAPTER 5 Page 2of 83 ± Noise Filter
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MPLIFIER AMPLIFIER ± Device that amplifies the signal’s amplitude from the transducer so that it can be displayed or recorded. ± For amplifier without any feed, voltage multiplication (Av) is obtained through the output voltage (V ut ) to out input voltage (V in ) ratio. Dr. Abdirahman CHAPTER 5 Page 3of 83
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± Av = V out / V in. ± Output voltage is amplified through power factor (A) and input voltage. v is known as “open op gain” if ± Av is known as open-loop gain if there is no feedback. ± If the amplifier is being fed, Av is pg , known as closed-loop gain where Av’ = V out /V in ’. Dr. Abdirahman CHAPTER 5 Page 4of 83
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Open Open-Loop Condition Loop Condition Amplifier Vin Vout Dr. Abdirahman CHAPTER 5 Page 5of 83
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Closed Closed-Loop Condition: Loop Condition: Amplifier Vin’ Vout’ β eedback Loop Dr. Abdirahman CHAPTER 5 Page 6of 83 Feedback Loop
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Feedback Amplifier ± Part of the amplifier output are feedback into the input circuit. p ± Consist of two parts, which are:
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This note was uploaded on 05/09/2010 for the course CHE 3022 taught by Professor Abdirahman during the Fall '07 term at National Central University.

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Chapter 05A - Signal Modifier - CHAPTER V SIGNAL MODIFIER...

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