High Speed ​​FET Input Instrumentation Amplifier Circuit Diagram

　　The circuit shown in the figure below is a high-speed FET- input, gain-5 instrumentation amplifier with a wide 35 MHz bandwidth and excellent AC common-mode rejection (CMR) performance of 55 dB at 10 MHz. This circuit is suitable for applications requiring high input impedance, fast instrumentation amplifiers, including RF, video, optical signal detection, and high-speed instrumentation. The high CMR and wide bandwidth characteristics also make it ideal for wideband differential line receivers.

　　Most discrete instrumentation amplifiers require expensive matched resistor networks to achieve high CMR performance; however, this circuit's use of an integrated differential amplifier along with on-chip matched resistors not only improves performance, reduces cost, but also minimizes printing Circuit board (PCB) layout area.