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Electronics Reference

Operational Amplifiers (Special-Purpose Circuits)

Instrumentation Amplifier Configuration

Overall Closed-Loop Gainlatex!encoded:base64,XHRleHRybXtBfV97Y2x9PTErXGZyYWN7Mlx0ZXh0cm17Un19e1x0ZXh0cm17Un1fe1x0ZXh0cm17R319fQ==

where R1 = R2 = R
External Gain-Setting Resistorlatex!encoded:base64,XHRleHRybXtSfV97XHRleHRybXtHfX09XGZyYWN7Mlx0ZXh0cm17Un19e1x0ZXh0cm17QX1fe2NsfS0xfQ==
Output Voltagelatex!encoded:base64,XHRleHRybXtWfV97b3V0fT1cdGV4dHJte0F9X3tjbH1cbGVmdCAoIFx0ZXh0cm17Vn1fe2luX3syfX0tXHRleHRybXtWfV97aW5fezF9fSBccmlnaHQgKQ==
No Equation

Isolation Amplifier Configuration

Input Stage Gainlatex!encoded:base64,XHRleHRybXtBfV97dl97MX19PVxmcmFje1x0ZXh0cm17Un1fe2ZfezF9fX17XHRleHRybXtSfV97aV97MX19fSsx
Output Stage Gainlatex!encoded:base64,XHRleHRybXtBfV97dl97Mn19PVxmcmFje1x0ZXh0cm17Un1fe2ZfezJ9fX17XHRleHRybXtSfV97aV97Mn19fSsx
Total Amplifier Gainlatex!encoded:base64,XHRleHRybXtBfV97dl97KHRvdCl9fT1cdGV4dHJte0F9X3t2X3sxfX1cdGV4dHJte0F9X3t2X3syfX0=
No Equation

Operational Transconductance Amplifier

Transconductancelatex!encoded:base64,Z197bX09XGZyYWN7XHRleHRybXtJfV97b3V0fX17XHRleHRybXtWfV97aW59fT1cdGV4dHJte0t9XHRleHRybXtJfV97XHRleHRybXtCSUFTfX0=
Voltage Gainlatex!encoded:base64,XHRleHRybXtBfV97dn09Z197bX1cdGV4dHJte1J9X3tcdGV4dHJte0x9fQ==
No Equation

Log Amplifier with a Diode

latex!encoded:base64,XHRleHRybXtWfV97b3V0fSBcY29uZyAtKDAuMDI1XHRleHRybXtWfSlcO1x0ZXh0cm17bG59XGxlZnQgKCBcZnJhY3tcdGV4dHJte1Z9X3tpbn19e1x0ZXh0cm17SX1fe1x0ZXh0cm17Un19XHRleHRybXtSfV97MX19IFxyaWdodCAp

Note: IR is a constant for a given diode

No Equation

Log Amplifier with a BJT

latex!encoded:base64,XHRleHRybXtWfV97b3V0fT0tKDAuMDI1XHRleHRybXtWfSlcO1x0ZXh0cm17bG59XGxlZnQgKCBcZnJhY3tcdGV4dHJte1Z9X3tpbn19e1x0ZXh0cm17SX1fe1x0ZXh0cm17RUJPfX1cdGV4dHJte1J9X3sxfX0gXHJpZ2h0ICk=

Note: IEBO is the emitter-to-base leakage current

No Equation

Antilog Amplifier

latex!encoded:base64,XHRleHRybXtWfV97b3V0fT0tXHRleHRybXtSfV97Zn19XHRleHRybXtJfV97XHRleHRybXtFQk99fVw7XHRleHRybXthbnRpbG9nfVxsZWZ0ICggXGZyYWN7XHRleHRybXtWfV97aW59fXsyNVx0ZXh0cm17bVZ9fSBccmlnaHQgKQ==
No Equation

Constant-Current Source

latex!encoded:base64,XHRleHRybXtJfV97XHRleHRybXtMfX09XGZyYWN7XHRleHRybXtWfV97aW59fXtcdGV4dHJte1J9X3tpfX0=
No Equation

Current-to-Voltage Converter

latex!encoded:base64,XHRleHRybXtWfV97b3V0fT1cdGV4dHJte0l9X3tpfVx0ZXh0cm17Un1fe2Z9
No Equation
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