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Digital Radio Transmitter Modules for 37 to 40Ê GHz
Technical Data
DRT1-38XX
Features
•Integrated Microwave/ Millimeter-Wave Modules
•Low Phase Noise
•Silicon Bipolar VCO
•Full Band Tuning
•GaAs MMIC Output Stage
•Sample Output for Phase Locking
•Excellent Tuning Linearity
•30 dB Attenuator
•Waveguide/RF Output
•Detected Output
Description
This digital radio transmitter module is designed for medium data rate point to point communication systems operating at
38Ê GHz. This module offers excellent phase noise performance and can be easily phase locked to a frequency reference. The transmitter module provides +19 dBm of output power, ideal for use in radios using 2 and 4 level FSK modulation. The module features an ultra low noise silicon bipolar VCO operating in the S/C band. A portion of the oscillator output is coupled off and is applied to a frequency divider network.
Block Diagrams
Transmitter Module Without Attenuator
Modulation Input |
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Tuning |
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BPF |
MMIC |
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BPF |
MMIC |
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Voltage |
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LO |
X4 |
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AMP |
X2 |
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AMP |
RF Out 37 |
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to 40 GHz |
Signal |
+16 |
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Sample |
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Output |
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Mute |
Detector |
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Transmitter Module With Attenuator |
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Modulation Input |
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MMIC |
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Tuning |
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BPF |
MMIC |
BPF |
AMP |
Attenuator |
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Voltage |
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LO |
X4 |
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AMP |
X2 |
MMIC |
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RF Out 37 |
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to 40 GHz |
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AMP |
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Signal |
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Detector |
Control |
Attenuator |
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+16 |
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Mute |
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Sample |
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Output |
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5965-5089E |
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8-16 |
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The low frequency output (less than 1 GHz) from the frequency divider can be easily used to phase lock the source. The main oscillator output is applied to a frequency multiplier network to produce the desired output frequency in the 37 to 40 GHz range. The output of this network is filtered then amplified by a GaAs MMIC device to produce the required output power. A detected sample of the output signal is provided to facilitate built in test of key radio components.
Applications
This digital radio module supplies the transmitter function in radios operating in the 37 to 40Ê GHz band. The source provides close to 100 mW output power over the temperature range of -30°C to +70°C. Included within the transmitter module is a muting function to reduce output power by 50 dB for “hot standby” applications. An internal voltage controlled attenuator function is optional allowing for 30 dB dynamic range adjustment.
DRT1-38XX Absolute Maximum Ratings (TA = -30 to +70ºC)
Parameters |
Units |
Ratings |
DC Circuit Power +10 |
Volts |
11 |
+5.0 |
Volts |
+5.5 |
-5.0 |
Volts |
-4.5 |
Power Control |
Volts |
5 |
Tuning Voltage |
Volts |
17 |
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Notes:
1.Operation in excess of any one of these parameters may result in permanent damage.
2.A thermal interface medium must be used between the bottom of the package and its mating surface to ensure optimum heat transfer.
Electrical Characteristics
Part Number |
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DRT1-3823 |
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DRT1-3813 |
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Parameters |
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Units |
Min. |
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Typ. |
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Max. |
Min. |
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Typ. |
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Max. |
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RF Tuning Range |
GHz |
37 |
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40 |
37 |
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40 |
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Operating Temperature Range |
°C |
-30 |
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70 |
-30 |
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70 |
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Storage Temperature Range |
°C |
-45 |
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85 |
-45 |
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85 |
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RF Power Output |
dBm |
18 |
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19 |
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18 |
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19 |
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Sample Out Frequency |
MHz |
289 |
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313 |
289 |
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313 |
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Sample Out Power |
dBm |
-10 |
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0 |
-10 |
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0 |
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Detected Out |
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V |
0.4 |
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2 |
0.4 |
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2 |
Harmonics and Sub-Harmonics |
dBc |
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-30 |
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-30 |
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from 2.65 to 55 GHz from carrier [1] |
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Spurious Output |
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from 2.65 - 55 GHz [1] |
dBc |
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-30 |
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-30 |
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@ fo ± 1.0 GHz |
dBc |
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-50 |
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-50 |
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@ prescaler output frequency |
dBc |
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-30 |
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-30 |
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Phase Noise @ 100 KHz |
dBc |
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-82 |
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-80 |
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-82 |
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-80 |
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Tuning Voltage |
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V |
1 |
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16 |
1 |
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16 |
Input Capacitance, Nom |
pf |
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27 |
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27 |
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Main Tuning Sensitivity |
MHz/V |
200 |
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400 |
200 |
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400 |
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Main Tuning Sensitivity Variation |
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1.5:1 |
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2.0:1 |
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1.5:1 |
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2.0:1 |
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Modulation Bandwidth |
MHz |
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20 |
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20 |
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Modulation Sensitivity |
MHz/V |
10 |
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35 |
10 |
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35 |
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Modulation Sensitivity Variation |
% |
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20 |
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20 |
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DC Circuit Power +10 Volts |
mA |
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175 |
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175 |
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+5 Volts |
mA |
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975 |
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600 |
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-5 Volts |
mA |
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50 |
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50 |
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Frequency Pushing on +10V Line |
MHz/V |
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40 |
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50 |
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40 |
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50 |
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based on ± 0.2V variation |
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VSWR @ Full Power Output [2] |
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2.5:1 |
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2.5:1 |
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Mute Control |
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dBc |
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-50 |
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-50 |
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Mute Control Range |
V |
0 |
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5 |
0 |
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5 |
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RF Connector |
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WR-28 |
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WR-28 |
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Attenuator Range |
dB |
30 |
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NA |
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Attenuator Control Voltage |
V |
0 |
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5 |
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NA |
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RF Output Dynamic Range |
dB |
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30 Min. |
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NA |
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Humidity |
Non Condensing |
% |
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85 |
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85 |
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Condensing |
% |
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95 |
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95 |
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Case Size |
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inches |
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3.50x1.25x0.40 |
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3.50x1.25x0.40 |
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Notes:
1.Tested only to 50 GHz
2.Module is unconditionally stable with this load VSWR of 2.0:1
8-17
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