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INA_Gain_Block/README.md

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INA Gain Block

INA Gain Block is designed for Kirdy Laser Diode Noise Measurement. It may be also useful for other applications requiring an instrumentation amplifier. For design details, please read this issue.

Target Specs

  • Support 8V Signal Input Voltage
  • High Pass Filter with flat passband from 10Hz to 1MHz
  • 2000x Gain
  • < 3nV/rt(Hz) @ 1kHz Noise Floor
  • 50 Ohm Output Impedance

Configurable Options

You can change the IC, resistors or capacitors for different applications.

  • instrumentation Amplifier
    • TI INA848/INA849 or ADI AD8428/AD8429 instrumentation Amplifier
    • INA849/AD8429: Configurable Gain
    • INA848/AD8428: Configurable LPF (2000x Gain)
  • Analog Front End
    • Single-Ended / Differential Input Signal
    • Low Pass Filter / High Pass Filter
  • Analog Output
    • Configurable DC Bias Voltage
    • Low Pass Filter / High Pass Filter

Usage Notes

For best noise floor, external ultra-low noise LDO is needed to be used.