The circuit is a high speed FET input, gain-of-5 instrumentation amplifier (in-amp) with a wide bandwidth (35 MHz) and excellent ac common-mode rejection, CMR, (55 dB at 10 MHz). The circuit is ideal for applications where a high input impedance, fast in-amp is required, including RF, video, optical signal sensing, and high speed instrumentation. The high CMR and bandwidth also makes it ideal as a wideband differential line receiver. Ideal as a wideband differential line receiver.

• EVAL-CN0273-EB1Z circuit evaluation board
• +/-5 V dual power supply
• Signal generator with a balanced differential drive source
• 3 SMA to BNC Connector

 +/-5V supply should be supplied to the connector for proper operation of the evaluation board  

 Signal Generator w/ Balanced Differential Drive Source can be used as an input source.

• Maximum allowable differential input is ±3.5 V/G1, where G1 is the gain of the first stage.

• Allowable input common-mode range for the composite circuit is from −3.5 V to +2.2 V

• Allowable input frequency bandwidth is 35MHz @ -3dB, typical for G = 5

 Oscilloscope can be used to measure the output of the evaluation board with a gain of 14db below 10Mhz input as indicited in the graph below.

• The circuit has a differential inputs gain of 1 + 2RF/RG
  • Where,
    • RF = Resistor R5 and R6
    • RG = Resistor R7

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