SSDA010 August   2025 MSPM0G3507

 

  1.   1
  2. 1Description
  3. 2Required Peripherals
  4. 3Design Steps
  5. 4Design Considerations
  6. 5Software Flow Chart
  7. 6Device Configuration
  8. 7Application Code
    1. 7.1 Application Code – Cascaded Signal Computation
  9. 8Results
  10. 9Additional Resources
  11.   Trademarks

8 Results

Figure 8-1 shows measured outputs from the two-stage amplifier: Orange (C1) as the output of OPA0, and Blue(C2) as the output of OPA1. The input signal is a 250mHz, 10mVpp sine wave with a 505mV DC offset. As seen, OPA1 further amplifies the OPA0 output, but due to high gain, limited supply headroom, and saturation accountability, the waveform does not linearly follow the input unlike OPA0 output that remains relatively smooth, while experiencing a lower gain and thus operates well within the linear range.

MSPM0G3507 OPA0 and OPA1 Outputs Figure 8-1 OPA0 and OPA1 Outputs

To address this, the system, as stated in the previous section, calculate the true amplified signal (G1 × G2 × Vin) in software, reconstructing the undistorted version based on known gain and bias settings, even if the physical output clips. Figure 8-2 represents the cascade signal.

MSPM0G3507 Cascade Signal Figure 8-2 Cascade Signal