Log and Antilog Amplifier - Amit...
Transcript of Log and Antilog Amplifier - Amit...
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LOG AND ANTILOG
AMPLIFIER
Prepared By:
Amit Degada
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Introduction
� Log and Antilog Amplifiers are non-linear circuits in which the outputvoltage is proportional to the logarithm (or exponent) of the input.
� It is well known that some processes such as multiplication anddivision, can be performed by addition and subtraction of logs.
� They have numerous applications in electronics, such as:� Multiplication and division,
� Powers and roots
� Compression and Decompression
� True RMS detection
� Process control
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Two basic circuits
� There are two basic circuits for logarithmic
amplifiers
� transdiode and
� diode connected transistor� diode connected transistor
� Most logarithmic amplifiers are based on the
inherent logarithmic relationship between the
collector current, Ic, and the base-emitter voltage,
vbe, in silicon bipolar transistors.
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Two basic circuits
Fig: Transdiode Log Amplifier Fig: Diode coected Resistor Log
Amplifier
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Transdiode Log Amplifier
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Thermal and Frequency
stability
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IC Log Amps
Note: ( FYI: For your Information Only)
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Temprature Compensation
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Temprature Compensation
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Diode-connected Log Amp
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Exponential (Antilog) Amplifiers
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Antilog Amplifier
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Log-Antilog
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Basic Multiplier
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Multiplication Stages
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block diagram of an
analog multiplier
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Basic Multiplier Circuitry
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Basic Multiplier Continue……
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Four-Quadrant Multipliers
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Multiplier Applications
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Amplitude Modulation
& Squaring
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Reference
1.Book, “Op-Amps, Design, Application and
Troubleshooting”, David L. Terrell, second Edition,
Butterworth-Heinemann Publication.
2. Application report, Texas Instruments “HANDBOOK2. Application report, Texas Instruments “HANDBOOK
OF OPERATIONAL AMPLIFIER
APPLICATIONS”, Bruce Carter and Thomas R. Brown,
October 2001
3. Website: www.electronics.dit.ie
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Thank You
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Instruction for Printing
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