This document describes a method for correlating Pin vs. Pout curves from two different RF testing platforms. It involves aligning the compression points (P1dB) of the curves and then offsetting the Pin values to minimize the standard deviation of the relative Pout differences across a given range. The Pin values from one platform are swept in small increments and the relative Pout differences from the other platform are calculated at each Pin value. The Pin offset that results in the lowest standard deviation of the relative Pout differences is selected to correlate the two curves.

1. Pin vs. Pout Correlation Solution
Curve Alignment

2. Purpose
• Correlate Test Platform 2 to Test Platform 1
using Pin vs. Pout sweep.
• Demonstrate second approach for correlating
two Pin vs. Pout curves.

3. Definition
• Test Platform 1 - Reference platform
• Test Platform 2 - Uncorrelated platform
• Relative Pout difference/delta – The difference
between Pout (from Test Platform 1) – Pout
(from Test Platform 2) at the same Pin level

4. Typical Uncorrelated Pin vs. Pout curves across 2
different RF testing platforms

5. Compression Point (P1dB) Alignment 1

6. Compression Point (P1dB) Alignment 2

7. Pout Offsetting

8. But… In compression region
• Where is the P1dB, P2dB, etc…?

9. Pin vs. Pout in Compression Region

10. Force P1dB Alignment 1

11. Force P1dB Alignment 2

12. Pout Offsetting

13. Second Solution:
Curve Alignment

14. Assumptions
• RF source and power reading instruments are
well calibrated across each platforms
• PA Characteristics of Pin vs. Pout is
approximately the same across different RF
testing platforms
– This is the backbone of my curve alignment
algorithm
• Curve alignment is the basis for correlation

15. Assumption: PA Characteristics of Pin vs. Pout is
approximately the same across different RF testing
platforms

16. Pin vs. Pout in Compression Region

17. Pin offsetting aimed to minimize relative Pout difference
Standard Deviation within any choice of range

18. Pin Offsetting Sweep Results Table
Test Platform 1 Test Platform 2 Test Platform 2 relative Pout difference
Pin Pout Pout Pin + 0 Pin - 1 Pin - 2 Pin - 3 Pin - 4 Pin - 5 Delta + 0 Delta - 1 Delta - 2 Delta - 3 Delta - 4 Delta - 5
-10 18.3 15.7 -10 -11 -12 -13 -14 -15 2.6
-9.5 18.6 16.1 -9.5 -10.5 -11.5 -12.5 -13.5 -14.5 2.5
-9 18.8 16.5 -9 -10 -11 -12 -13 -14 2.3 1.8
-8.5 19 16.85 -8.5 -9.5 -10.5 -11.5 -12.5 -13.5 2.15 1.75
-8 19.2 17.2 -8 -9 -10 -11 -12 -13 2 1.6 1.1
-7.5 19.4 17.5 -7.5 -8.5 -9.5 -10.5 -11.5 -12.5 1.9 1.5 1.1
-7 19.55 17.8 -7 -8 -9 -10 -11 -12 1.75 1.4 1 0.5
-6.5 19.7 18.1 -6.5 -7.5 -8.5 -9.5 -10.5 -11.5 1.6 1.3 0.9 0.5
-6 19.85 18.3 -6 -7 -8 -9 -10 -11 1.55 1.25 0.9 0.5 0
-5.5 20 18.5 -5.5 -6.5 -7.5 -8.5 -9.5 -10.5 1.5 1.2 0.9 0.5 0.1
-5 20.15 18.7 -5 -6 -7 -8 -9 -10 1.45 1.15 0.85 0.5 0.1 -0.4
-4.5 20.3 18.9 -4.5 -5.5 -6.5 -7.5 -8.5 -9.5 1.4 1.1 0.8 0.5 0.1 -0.3
-4 20.4 19.05 -4 -5 -6 -7 -8 -9 1.35 1.1 0.8 0.5 0.15 -0.25
-3.5 20.5 19.2 -3.5 -4.5 -5.5 -6.5 -7.5 -8.5 1.3 1.1 0.8 0.5 0.2 -0.2
-3 20.6 19.35 -3 -4 -5 -6 -7 -8 1.25 1.05 0.8 0.5 0.2 -0.15
-2.5 20.7 19.5 -2.5 -3.5 -4.5 -5.5 -6.5 -7.5 1.2 1 0.8 0.5 0.2 -0.1
-2 20.8 19.65 -2 -3 -4 -5 -6 -7 1.15 0.95 0.75 0.5 0.2 -0.1
-1.5 20.9 19.8 -1.5 -2.5 -3.5 -4.5 -5.5 -6.5 1.1 0.9 0.7 0.5 0.2 -0.1
-1 21 19.9 -1 -2 -3 -4 -5 -6 1.1 0.9 0.7 0.5 0.25 -0.05
-0.5 21.05 20 -0.5 -1.5 -2.5 -3.5 -4.5 -5.5 1.05 0.9 0.7 0.5 0.3 0
0 21.1 20.1 0 -1 -2 -3 -4 -5 1 0.9 0.7 0.5 0.3 0.05
0.5 21.15 20.2 0.5 -0.5 -1.5 -2.5 -3.5 -4.5 0.95 0.85 0.7 0.5 0.3 0.1
1 21.2 20.3 1 0 -1 -2 -3 -4 0.9 0.8 0.7 0.5 0.3 0.1
1.5 21.25 20.4 1.5 0.5 -0.5 -1.5 -2.5 -3.5 0.85 0.75 0.65 0.5 0.3 0.1
2 21.3 20.5 2 1 0 -1 -2 -3 0.8 0.7 0.6 0.5 0.3 0.1
2.5 21.35 20.55 2.5 1.5 0.5 -0.5 -1.5 -2.5 0.8 0.7 0.6 0.5 0.35 0.15
3 21.4 20.6 3 2 1 0 -1 -2 0.8 0.7 0.6 0.5 0.4 0.2
3.5 21.45 20.65 3.5 2.5 1.5 0.5 -0.5 -1.5 0.8 0.7 0.6 0.5 0.4 0.25
4 21.5 20.7 4 3 2 1 0 -1 0.8 0.7 0.6 0.5 0.4 0.3
4.5 21.5 20.75 4.5 3.5 2.5 1.5 0.5 -0.5 0.75 0.7 0.6 0.5 0.4 0.3
5 21.5 20.8 5 4 3 2 1 0 0.7 0.7 0.6 0.5 0.4 0.3
5.5 21.5 20.85 5.5 4.5 3.5 2.5 1.5 0.5 0.65 0.65 0.6 0.5 0.4 0.3
6 21.5 20.9 6 5 4 3 2 1 0.6 0.6 0.6 0.5 0.4 0.3
Std Dev 0.282799 0.192505 0.101366 0 0.117011 0.212109

19. Pin (relative Pout difference Standard Deviation
minimized)

20. Pout Offset by averaging relative Pout difference within
any choice of range

21. Thank You
Ming Jiang