aft09ms031n, aft05ms031n application in tetra and
TRANSCRIPT
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External Use
TM
AFT09MS031N, AFT05MS031N
Application in Tetra and
DMR/dPMR
J U L Y . 2 0 1 5
Li Jun | RFPP FAE
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TM
External Use 1
RepeatersAnalog to Digital Revolution
Advantages of digital radio:
1. Frequency efficiency improved. Use the same frequency resource but improved volume;
2. Safety. The communication is encrypted and burst transmitted;
3. Traffic management. Intelligent channel resource allocation;
4. Diversify communication modes: peer to peer, peer to group, group to group;
5. Digital data. Voice, text, multimedia…
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External Use 2
RepeatersAnalog to Digital Revolution
• Some digital radio uses constant envelope modulation, so it can still
re-use the analog radio PA design; For those high order QAM and
OFDM modulations, power back off and linearizer is necessary.
Analog
Digital
dPMR,
DMR,
NXDN…
Digital
TETRA
compatible Backoff and linearity
needed
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External Use 3
Digital LMR--DMR
• DMR spec:
1. 4FSK modulation in 12.5kHz bandwith;
2. TDMA with 2 time slots.
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External Use 4
DMR TDMA diagram
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External Use 5
The Mobile Station Burst Timing
MS1 MS2
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External Use 6
2.5ms guard time between 2 slots
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External Use 7
TDD test on AFT0531
1. AFT0531 VHF demo is used for test;
2. Test at 135MHz. The CW data is below:
3. TTL pulse (30ms/60ms) is used to switch the AFT0531 gate with
1W Pin continuous on;
4. The test lasts for 10min. AFT0315 is OK.
Freq
(MHz)
Pin
(dBm)
Pout
(dBm)
Gain
(dB) IRL (dB) Eff (%) Vds (V) Ids (A)
135 30 46 16 -8 71.2 13.6 4.13
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External Use 8
Test setup diagram
B
A
R1: gate stability resistor
10Ohm;
C3: gate bypass cap 1nF;
R2C3 would smooth the pulse
with time constant=1us.
AFT0531
NPN Switch
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External Use 9
Pulse waveform
Pulse generator waveform
Rising time:<0.1us
VGS waveform
Rising time:<3us
Test lasts for 10min. AFT0315 is OK.
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External Use 10
Digial LMR--TETRA
• TETRA1--QPSK modulation in 25kHz, 3.6dB peak to average ratio;
• TETRA2--OFDM 25kHz, 10dB peak to average ratio!
• Linear amplifier is required to meet the spectrum mask;
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External Use 11
AFT05MP075 5-10W TETRA2 PA
Frequency band: 380-475MHz;
VDS=13.2V.
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External Use 12
Linearity under 10dB PAR signal
Test signal: IS95 1C
10.3dB PAR
Pout=37dBm
The APCR improved to
50dBc after IDQ and VDS
feeder changed.
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External Use 13
Linearity vs Output Power
Test signal: IS95 1C
10.3dB PAR
Pout=37dBm
1A IDQ
The APCR remains below
50dBc until 39dBm Pout.
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External Use 14
Test signal: IS95 1C
10.3dB PAR
Pout=37dBm
1A IDQ
PAR vs Output Power
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External Use 15
Test signal: IS95 1C
10.3dB PAR
Pout=37dBm
1A IDQ
Efficiency vs Output Power
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External Use 16
Conclusion
• With proper VDS feeder inductance and bypass caps, 0575 380-
450MHz demo linearity can be improved by 10dB (dual bias has
2dB improvement) ;
• 0575 has super linearity performance under high PAR complex
modulated signal.
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External Use 17
AFT0531 5W TETRA2 PA
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External Use 18
AFT0531 380-475MHz CW data
Freq (MHz)
Pin (dBm)
Pout (dBm)
Pout (W)
Gain (dB)
IRL (dB) Eff (%) Vds (V) Vgs (V)
Idmm (A)
Idmmq (A)
380 27.0 45.3 33.7 18.3 -9.8 59.4 13.2 3.1 4.3 0.5
390 27.0 45.5 35.8 18.5 -10.5 62.9 13.2 3.1 4.3 0.5
400 27.0 45.4 34.9 18.4 -10.6 64.1 13.2 3.1 4.1 0.5
410 27.0 45.2 33.3 18.2 -10.6 63.2 13.2 3.1 4.0 0.5
420 27.0 45.7 36.9 18.7 -10.6 70.4 13.2 3.1 4.0 0.5
430 27.0 45.7 37.3 18.7 -10.9 72.4 13.2 3.1 3.9 0.5
440 27.0 45.6 36.6 18.6 -11.3 71.6 13.2 3.1 3.9 0.5
450 27.0 45.6 36.6 18.6 -11.8 70.1 13.2 3.1 3.9 0.5
460 27.0 45.6 36.4 18.6 -12.2 68.1 13.2 3.1 4.0 0.5
470 27.0 45.5 35.7 18.5 -11.6 67.2 13.2 3.1 4.0 0.5
475 27.0 45.4 34.7 18.4 -10.9 66.9 13.2 3.1 3.9 0.5
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External Use 19
AC
-60.0
-55.0
-50.0
-45.0
-40.0
-35.0
-30.0
-25.0
-20.0
350 370 390 410 430 450 470 490
AC
PR
(dB
c)
Freq(MHz)
ACPR at 5W Pout
ACPR_L
ACPR_H
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External Use 20
AFT0531 380-475MHz output PAR
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
350 370 390 410 430 450 470 490
PA
R(d
B)
Freq(MHz)
PAR at 5W Pout
PAR
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External Use 21
AFT09MA007 4W 350-520MHz TETRA1
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External Use 22
CW performance
Eff>50%@8W Pout
Eff>50%@5W Pout for freq>370MHZ
0
10
20
30
40
50
60
70
80
0 2 4 6 8 10 12 14
Dra
in E
ffic
ien
cy (
%)
Output Power (W)
AFT907N UHF CW Efficiency vs Output PowerVDD=7.5V, IDQ=100mA
350 MHz
370 MHz
400 MHz
445 MHz
470 MHz
520 MHz
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External Use 23
Power vs. linearity
ACPR <-35dB @4W Pout from 350-490MHz
-50.00
-45.00
-40.00
-35.00
-30.00
-25.00
-20.00
-15.00
-10.00
-5.00
0.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00
AC
PR
Ad
j-L
(d
Bc)
Output Power (W)
AFT907N UHF Tetra1 ACPR vs Output Power
350 MHz
370 MHz
400 MHz
420 MHz
450 MHz
490 MHz
520 MHz
VDD = 7.5V
IDQ = 200mA
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External Use 24
Freq vs. linearity
ACPR <-35dB @4W Pout from 350-490MHz
-50.00
-45.00
-40.00
-35.00
-30.00
-25.00
350 370 390 410 430 450 470 490 510
AC
PR
Ad
j-L
(d
Bc)
Frequency (MHz)
AFT907N UHF Tetra1 ACPR vs Frequency
34.8dBm
35.8dBm
36.0dBm
37.0dBm
VDD = 7.5V
IDQ = 200mA
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External Use 25
AFT05MS031 30W SSB Application
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External Use 26
2 tone linearity-100kHz
Part IDFreq (MHz)
Pin (dBm)
Pout (dBm)
PEP (W)
Gain (dB)
IRL (dB)
IM3L (dB)
IM3H (dB)
IM5L (dB)
IM5H (dB)
Eff (%)
IdSupply (A)
Vds (V)
Vgs (V)
IdSupplyq (A)
30W_12.5V 27.5 16.3 41.8 30.0 25.5 -13.8 -31.5 -31.8 -36.9 -37.2 47.6 2.5 12.5 3.1 0.730W_12.5V 30 16.6 41.7 29.9 25.2 -15.0 -38.2 -40.8 -42.7 -43.2 44.4 2.7 12.5 3.1 0.730W_12.5V 35 16.8 41.8 30.1 25.0 -18.6 -31.8 -33.4 -39.9 -40.0 43.1 2.8 12.5 3.1 0.730W_12.5V 40 17.1 41.8 30.0 24.7 -19.6 -31.9 -33.0 -38.4 -38.7 41.7 2.9 12.5 3.1 0.7
40W-13.8V 27.5 17.6 43.0 40.0 25.4 -13.8 -27.3 -27.1 -33.8 -34.1 49.9 2.9 13.8 3.1 0.7
40W-13.8V 30 17.8 43.0 40.1 25.2 -15.1 -35.8 -36.8 -38.5 -38.7 46.9 3.1 13.8 3.1 0.740W-13.8V 35 18.0 43.0 40.0 25.0 -18.6 -30.1 -31.0 -36.8 -36.9 45.2 3.2 13.8 3.1 0.7
40W-13.8V 40 18.4 43.0 40.0 24.6 -19.5 -29.0 -29.5 -35.1 -35.2 43.6 3.3 13.8 3.1 0.7
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External Use 27
Conclusion
1. Freescale LMR power devices have excellent performance under
digital LMR modulation;
2. It can handle ~us gate switch speed under saturation Pout;
3. Combined with super power ability and linearity make it quite
good for high PAR modulation applications.
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© 2015 Freescale Semiconductor, Inc. | External Use
www.Freescale.com