MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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by MRFA2604/D
The RF Line
Broadband R.F. Array for
TV Transmitter
The MRFA2604 is a solid state class AB amplifier specifically designed for TV
transposers and transmitters. This amplifier incorporates microstrip technology
and reliable Motorola push–pull transistors.
The MRFA2604 includes a thermal compensation (differential gain is
constant versus average picture level (APL)) which can be partially discon-
nected.
•
Specified 28 Volts, 470–860 MHz Characteristics
Output Power = 175 Watts (CW)/230 Watts (Video)
Minimum Gain = 8.0 dB (@ Nominal Power)
•
50
Ω
Input and Output Impedance
•
Class AB Operation
•
Thermally Compensated
MRFA2604
230 W PEAK SYNC.
470 – 860 MHz
CLASS AB
RF POWER AMPLIFIER
CASE 439–01, STYLE 1
MAXIMUM RATINGS
Rating
Supply Voltage
Current
Storage Temperature Range
Operating Temperature (1)
Symbol
VCC
Imax
Tstg
Top
Value
32
15
– 40 to +100
– 20 to + 70
Unit
Vdc
Adc
°C
°C
NOMINAL OPERATION CONDITION
Supply Voltage/Quiescent Current (2)
VCC = 28 V
IQ = 0.9 A
ELECTRICAL CHARACTERISTICS IN CW
(TC = 25°C, VCC = 28 V, IQ = 0.5 A, without thermal correction)
Characteristic
Instantaneous Bandwidth
Power Gain (Pout = 175 W)
Gain Ripple (Pout = 175 W)
Output Power @ 1.0 dB Compression
Efficiency (Pout = 175 W)
Input Return Loss
Symbol
BW
Gp
Grple
Pout
η
IRL
Min
470
8.0
—
175 (3)
45 (3)
—
Typ
—
9.0
±
0.5
190
50
– 20
Max
860
—
±
1.0
—
—
–15
Unit
MHz
dB
dB
W
%
dB
ELECTRICAL CHARACTERISTICS IN VIDEO
(TC = 25°C, Isup = 0.9 A, with thermal compensation)
Characteristic
Output Power @ 28 V (Peak Sync. B/G standard)
Power Gain @ black level (Psync = 230 W, VCC = 28 V)
(2) Tuned in the factory for optimum thermal correction @ 25°C.
(3) Thermal correction cannot be disconnected, and CW performances are slightly affected (– 5.0 W, – 3% typical), but output power with a
video signal remain the same.
Symbol
Pout
Gp
Min
230
8.0
Typ
240
9.0
Max
—
—
Unit
W
dB
(1) Temperature is measured at temperature test point (on the flange of the transistor).
REV 1
©
Motorola, Inc. 1997
MOTOROLA RF DEVICE DATA
MRFA2604
1
TYPICAL CHARACTERISTICS
MAXIMUM AVERAGE OUTPUT POWER (CW)
200
180
160
140
120
100
80
60
40
20
0
0
10
20
30
40
50
60
70
TRANSISTOR FLANGE TEMPERATURE (°C)
80
MAXIMUM PEAK SYNCH. OUTPUT POWER (CW)
400
360
320
280
240
200
160
120
80
40
0
0
10
20
30
40
50
60
70
TRANSISTOR FLANGE TEMPERATURE (°C)
80
Figure 1. Maximum Average Output Power
versus Temperature
Figure 2. Maximum Peak Synch. Output Power
(B/G Standard) versus Temperature
DIFFERENTIAL GAIN (%) WITH APL 10% / 90%
10
8
6
4
2
0
–2
–4
–6
–8
–10
DIFFERENTIAL GAIN (%) WITH APL 10% / 90%
10
8
6
4
2
0
–2
–4
–6
–8
–10
(TYPICAL)
(TYPICAL)
Figure 3. Without Thermal Compensation
Figure 4. With Thermal Compensation
WARNING:
Please read instructions carefully for operating/set–up and mounting recommendations prior to operating this device.
INPUT
MATCHING
NETWORK
BALUN
BALUN
50
Ω
LOAD
OUTPUT
MATCHING
NETWORK
OUTPUT
(*)
BIAS CIRCUIT
VCC
(*)
INPUT
MATCHING
NETWORK
OUTPUT
MATCHING
NETWORK
BALUN
INPUT
BALUN
50
Ω
LOAD
* Loads positions can be inverted if
required.
Figure 5. Internal Schematic and External Connections
MRFA2604
2
MOTOROLA RF DEVICE DATA
CW MEASUREMENTS WITHOUT THERMAL COMPENSATION**
(see Figure 23)
10
GAIN COMPRESSION (dB)
PG, POWER GAIN (dB)
0
9
1
8
VCC = 28 V
ICQ = 500 mA
Pout = 180 W
2
VCC = 28 V
ICQ = 500 mA
Pout = 180 W
450
f, FREQUENCY (MHz)
900
450
f, FREQUENCY (MHz)
900
Figure 6. Power Gain versus Frequency
Figure 7. Gain Compression versus Frequency
14
SUPPLY CURRENT (A)
13
12
11
10
VCC = 28 V
ICQ = 500 mA
Pout = 180 W
POWER GAIN (dB)
11
HOT (TENTH SWEEP)
10
COLD (FIRST SWEEP)
VCC = 28 V
ICQ = 500 mA
Pmax = 200 W
9
450
f, FREQUENCY (MHz)
900
– 20
Pin, POWER (dB)
0.00
Figure 8. Supply Current versus Frequency
Figure 9. Power Gain versus Input Power
** Measurement results are typical values and are not guaranteed
MOTOROLA RF DEVICE DATA
MRFA2604
3
VIDEO MEASUREMENTS WITH THERMAL COMPENSATION, B/G STANDARD
(Measurement results are typical values and are not guaranteed)
DIFFERENTIAL GAIN (%) / CHANNEL 69 / 28 V/900 mA
10
8
6
4
2
0
–2
–4
–6
–8
–10
DIFFERENTIAL GAIN (%) / CHANNEL 69 / 28 V/900 mA
10
8
6
4
2
0
–2
–4
–6
–8
–10
190 W SYNC
240 W SYNC
Figure 10. Differential Gain 190 W Sync
DIFFERENTIAL PHASE (°) / CHANNEL 69 / 28 V/900 mA
6
190 W SYNC
4
2
0
–2
–4
–6
Figure 11. Differential Gain 240 W Sync
DIFFERENTIAL GAIN (°) / CHANNEL 69 / 28 V/900 mA
6
240 W SYNC
4
2
0
–2
–4
–6
Figure 12. Differential Phase 190 W Sync
Figure 13. Differential Phase 240 W Sync
“RED FIELD” / CHANNEL 69 / 28 V/900 mA
“RED FIELD” / CHANNEL 69 / 28 V/900 mA
190 W SYNC
240 W SYNC
SIDE BAND REGENERATION 10 dB/div–2 MHz/div
SIDE BAND REGENERATION 10 dB/div–2 MHz/div
Figure 14. “Red Field” 190 W Sync
Figure 15. “Red Field” 240 W Sync
MRFA2604
4
MOTOROLA RF DEVICE DATA
VIDEO MEASUREMENTS WITH THERMAL COMPENSATION, BG STANDARD
(Measurement results are typical values and are not guaranteed)
“HORIZONTAL SWEEP” / CHANNEL 69 / 28 V/900 mA
“HORIZONTAL SWEEP” / CHANNEL 69 / 28 V/900 mA
190 W SYNC
240 W SYNC
SIDE BAND REGENERATION 10 dB/div–2 MHz/div
SIDE BAND REGENERATION 10 dB/div–2 MHz/div
Figure 16. “Horizontal Sweep” 190 W Sync
RELATIVE INPUT SYNC. LEVEL TO MAINTAIN OUTPUT
SYNC. @ 27% OF RF POWER
250
INPUT SYNC. AMPLITUDE (%)
VCC = 28 V
ICQ = 900 mA
CHANNEL 69
BLACK LEVEL
10
POWER GAIN MAG. (dB)
Figure 17. “Horizontal Sweep” 240 W Sync
POWER SWEEP ON A NETWORK ANALYZER
(GAIN MAGNITUDE & GAIN PHASE)
20
VCC = 28 V
ICQ = 900 mA
Pmax = 200 W
f = 860 MHz
POWER GAIN PHASE (
°
)
200
9
10
150
8
0
100
100
140
180
220
P, PEAK OUTPUT POWER (W)
260
– 20
Pin, POWER (dB)
0.00
Figure 18. Input Sync. versus Output Power
Figure 19. Power Gain versus Input Power
10
TRANSMISSION DELAY (ns)
INTERMODULATION (dB)
– 40
VCC = 28 V
ICQ = 900 mA
– 8 dB/– 16 dB/– 10 dB
5
– 50
0
VCC = 28 V
ICQ = 900 mA
– 60
450
f, FREQUENCY (MHz)
900
50
860 MHz
665 MHz
470 MHz
100
150
200
P, PEAK OUTPUT POWER (W)
250
Figure 20. Delay versus Frequency
Figure 21. Intermodulation versus Output Power
MOTOROLA RF DEVICE DATA
MRFA2604
5
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