SBAU383A June   2021  – February 2022 BUF802

 

  1.   Trademarks
  2. 1 Introduction
  3. 2 Configuration and Usage
  4. 3 Power Connections
  5. 4 Input and Output Connections
  6. 5 Stand-Alone Buffer Configuration
  7. 6 Composite Loop Configuration
  8. 7 External Clamping
  9. 8 Schematic
  10. 9 Layout Prints
  11. 10Related Documentation
  12. 11Revision History

6 Composite Loop Configuration

The BUF802 device can be configured multiple ways in composite loops with a precision amplifier to handle low frequency high accuracy signals. The top board of the BUF802RGTEVM features the device in composite mode CL Mode configuration as referenced in BUF802 Wide-Bandwidth, 2.3 nV/√Hz, JFET Input Buffer. In this configuration, the precision amplifier (U2) handles the low frequency signals in the circuit and then the BUF802 takes over for high frequency signals. The poteniometer R16 or an optional DAC input on J3 can be used to adjust the gain matching between the low frequency and high frequency paths. By default R16 is not configured for ideal matching and the user should adjust the potentiometer for a flat transition between low and high frequency gains. For more detailed information on configuring the device for CL Mode operation, please refer to the BUF802 Wide-Bandwidth, 2.3 nV/√Hz, JFET Input Buffer.