AdvancedA-002-008-001
What is an operational amplifier (op-amp)?
B
Answer
Circuit design and power supplies
Type
A
A program subroutine that calculates the gain of an RF amplifier
B
A high-gain, direct-coupled differential amplifier whose characteristics are determined by components mounted externally
C
An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
D
A high-gain, direct-coupled audio amplifier whose characteristics are determined by internal components of the device
Answer Notes
An operational amplifier (op-amp) is a versatile integrated circuit functioning as a high-gain, direct-coupled differential amplifier. Its raw, internal 'open-loop' gain is extremely high, making it nearly impossible to use for linear amplification without modification.
To make an op-amp useful for practical applications, engineers apply negative feedback using external components like resistors and capacitors. These external components, rather than the internal circuitry, completely determine the amplifier's final operating characteristics such as gain and frequency response.
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The FET amplifier common gate circuit is similar to which of the following bipolar transistor amplifier circuits?
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What would be the characteristics of the ideal op-amp?