Glossary Definition for Transconductance Amplifier

Definition

An amplifier that converts a voltage to a current. Also known by several other terms (see synonym list). One synonym is OTA, or operational transconductance amplifier, a term that marries the terms transconductance amplifier and operational amplifier.

The term derives from "transfer conductance" and is measured in siemens (S), where 1 siemens = 1 ampere per volt. It is represented with the symbol g_m. The basic gain of vacuum tubes and FETs is expressed as transconductance.

See: Transconductance Amplifier Buffers Current Transformer

Synonyms

• OTA
• VCIS
• mutual conductance
• operational transconductance amplifier
• voltage controlled current source

Related Parts

• MAX435 - 250MHz Wideband Transconductance Amplifier with Differential Output
• MAX436 - 250MHz Wideband Transconductance Amplifier with Differential Output

See Also

• Transimpedance Amplifier
• FET
• Op amp
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