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Small Signal Current to Voltage Amplifier

IP.com Disclosure Number: IPCOM000074030D
Original Publication Date: 1971-Mar-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Mitby, JS: AUTHOR

Abstract

This circuit is a small-signal current to voltage amplifier which also has application as a differentiator. Current to voltage amplification is carried out through a pair of transistors having a direct-coupled current feedback from the emitter of the second transistor to the base of the first transistor.

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Small Signal Current to Voltage Amplifier

This circuit is a small-signal current to voltage amplifier which also has application as a differentiator. Current to voltage amplification is carried out through a pair of transistors having a direct-coupled current feedback from the emitter of the second transistor to the base of the first transistor.

The first stage (T1 and T2) of the amplifier performs the current to voltage transformation. The small-signal voltage at the collector of T2 is directly proportional to the amplifier's input current. Useful power gain is obtained from the amplifier with the addition of the two emitter-follower stages (T3 and T4) to the output. These two stages reduce the amplifier's output impedance from 100k ohms at T2 to approximately 40 ohms at T4.

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