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Which among the following is an output provided by transresistance amplifier?

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Which among the following is an output provided by transresistance amplifier?

(a) Output current proportional to signal voltage

(b) Output voltage proportional to signal current

(c) Output voltage proportional to input voltage

(d) Output current proportional to signal current

The question was posed to me during an interview.

Enquiry is from Frequency Compensation topic in division Frequency Response of Electronic Devices & Circuits

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Right answer is (b) Output voltage proportional to signal current

Easiest explanation: An amplifier which produces the output voltage in proportion to the signal current where the proportionality factor is independent of source and load resistances, is known as ‘Transresistance amplifier’. For a practical transresistance amplifier, input resistance must be very less than source resistance and the output resistance must be very less than load resistance.

Generally, it is the ratio of voltage to signal current. Conversely, the transconductance amplifier exhibits output current proportional to signal voltage. Voltage amplifier exhibits the output voltage proportional to input voltage & current amplifier exhibits the output current proportional to the signal current.

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