<^< Worksheet: Non-inverting Amplifier | Course index | Worksheet: Differential Amplifier >^>

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OperationalAmplifierCircuits /

Differential Amplifier

<^< Worksheet: Non-inverting Amplifier | Course Index | Worksheet: Differential Amplifier >^>(:nl:)

'''Click here to download TINA circuit file'''

The basic differential amplifier uses four external resistors: R'_IN_' (=R'_1_'=R'_2_') which defines the input resistance and R'_F_' (=R'_4_'=R'_3_') which defines the closed-loop voltage gain. Thus:

Input resistance = 2 � R'_IN_'

and:

Voltage gain, A'_V_' = R'_F_'/R'_IN_'

Note that neither side of the input signal is taken to the common 0V rail and the signal is said to be balanced. (:nl:)(:table style="clear:both":)

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Page last modified on July 29, 2011, at 09:44 AM