SDAA511 September   2026 OPA192 , PGA855

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Detailed Description
    1. 2.1 ATE Testing Card and Signal Sensing
    2. 2.2 Signal Sensing Requirements
    3. 2.3 Signal Sensing
    4. 2.4 General Purpose Sensing
    5. 2.5 Precision Signal Sensing
      1. 2.5.1 Middle and High Voltage Signal
      2. 2.5.2 Current Signal with Middle and High Common Mode Voltage
      3. 2.5.3 Signal Which Requires Very Low Current Leakage
      4. 2.5.4 Fast Voltage Signal
      5. 2.5.5 Ultra-High Voltage Signal
  6. 3Summary
  7. 4References

2.5 Precision Signal Sensing

There are many precision signals that need to be measured in an ATE system.Figure 2-3 is a typical precision voltage sensing circuit. A low leakage and fast buffer ( Figure 2-3) is placed before the resistor divider. In some cases, the PGA can take low leakage and scale down requirements, such as PGA855 and PGA849.

Precision Signal Sensing Topology Figure 2-3 Precision Signal Sensing Topology

Next, this document discusses some typical sensing approaches according to different voltage and current leakage and bandwidth requirements.