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# INA Gain Block
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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 ](https://git.m-labs.hk/sinara-hw/kirdy/issues/17 ).
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## 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.
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- instrumentation Amplifier
- TI INA848/INA849 or ADI AD8428/AD8429 instrumentation Amplifier
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- 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.
