Phase combining of high power amplifier

1. Phase Combining of high power
Amplifier
Shiv Dutt
Vedang Radio Technology

2. Block diagram

3. IPP-2043 Datasheet

4. Pin Configuration

5. Phase shifter selection
The major parameters of Phase Shifters are:
– frequency range
– bandwidth (BW),
– total phase variance (Δф),
– insertion loss (IL),
– power handling (P),
– accuracy and resolution,
– input/output matching (VSWR) or return loss (RL),

6. HMC934LP5E
• The HMC934LP5E is an Analog Phase Shifter
• Analog control voltage from 0 to +13V.
• Variable phase shift of 0 to 400 degrees
• Octave Bandwidth: 1 to 2 GHz
• A typical low phase error of +3.5V / -2 degrees.

7. Split phenomena
• In term of voltage (a vector quantity)
• In term of Power (a scalar quantity)

8. Mathematical analysis for Split and combine phenomena
In term of voltage
In term of Power
power can not be add like that so It is hypothetical to understand

9. Wave flow for Split and combine phenomena 1

10. Wave flow for Split and combine phenomena 2

11. Procedure
• Set maximum amplitude of power using variable
attenuation first and secondly, use phase shifter
movement.
• Repeat the same process at 10W, 50W, 100W,
200W and 400W.
• Output cables of Amplifiers must be equal to
avoid any mismatch or loose the power.
• Both 50E termination must be grounded with
screw.
• Split the total band width into two sub band

12. Practical Approach on Phase shifter board
Freq(MHz) P. fixed(dB) P. variable (dB) Voltage (V)
band 1
1350 -13.44 -10.71
Vamp=4.923V
Vphase=4.013V
1400 -13.38 -10.8
1460 -13.34 -10.9
band 2
1461 -13.34 -10.9
Vamp=4.923V
Vphase=4.013V
1500 -13.32 -10.96
1550 -13.34 -11
0dBm input signal
Intentionally hide

13. Working of Phase shifter without Amplifiers
Freq(MHz) S21 Voltage (V)
band 1
1350 -12.22
Vamp=4.923V
Vphase=4.013V
1400 -11.03
1460 -10.3
band 2
1461 -10.29
Vamp=4.923V
Vphase=4.013V
1500 -9.98
1550 -9.65
Freq(MHz) S21 Voltage (V)
band 1
1350 -9.74
Vamp=4.913V
Vphase=2.597V
1400 -9.55
1460 -9.75
band 2
1461 -9.8
Vamp=4.913V
Vphase=3.332V
1500 -9.73
1550 -9.81
0dBm input signal

14. Thank you