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Digital Radio Transmitter Modules for 37 to 40 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 38 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.
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 40 GHz band. The source provides close to 100 mW output power over the temperature range of -30C to +70C. 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.
Block Diagrams
Transmitter Module Without Attenuator
Modulation Input
Tuning Voltage LO Signal Sample +16 Output Mute X4 BPF MMIC AMP X2 BPF MMIC AMP RF Out 37 to 40 GHz
Detector
Transmitter Module With Attenuator
Modulation Input
Tuning Voltage LO Signal Sample +16 Output Mute X4 BPF MMIC AMP X2 BPF MMIC AMP Attenuator RF Out 37 to 40 GHz
Attenuator Control
MMIC AMP
Detector
5965-5089E
8-16
DRT1-38XX Absolute Maximum Ratings (TA = -30 to +70C)
Parameters DC Circuit Power +10 +5.0 -5.0 Power Control Tuning Voltage Units Volts Volts Volts Volts Volts Ratings 11 +5.5 -4.5 5 17
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 Parameters
RF Tuning Range Operating Temperature Range Storage Temperature Range RF Power Output Sample Out Frequency Sample Out Power Detected Out Harmonics and Sub-Harmonics from 2.65 to 55 GHz from carrier [1] Spurious Output from 2.65 - 55 GHz [1] @ fo 1.0 GHz @ prescaler output frequency Phase Noise @ 100 KHz Tuning Voltage Input Capacitance, Nom Main Tuning Sensitivity Main Tuning Sensitivity Variation Modulation Bandwidth Modulation Sensitivity Modulation Sensitivity Variation DC Circuit Power +10 Volts +5 Volts -5 Volts Frequency Pushing on +10V Line based on 0.2V variation VSWR @ Full Power Output [2] Mute Control Mute Control Range RF Connector Attenuator Range Attenuator Control Voltage RF Output Dynamic Range Humidity Non Condensing Condensing Case Size Notes:
1. Tested only to 50 GHz 2. Module is unconditionally stable with this load VSWR of 2.0:1
Units
GHz C C dBm MHz dBm V dBc
Min.
37 -30 -45 18 289 -10 0.4
DRT1-3823 Typ.
Max.
40 70 85
Min.
37 -30 -45 18 289 -10 0.4
DRT1-3813 Typ.
Max.
40 70 85
19 313 0 2 -30
19 313 0 2 -30
dBc dBc dBc dBc V pf MHz/V MHz MHz/V % mA mA mA MHz/V
-82 1 27 200 1.5:1 20 10 20
-30 -50 -30 -80 16 400 2.0:1 35 175 975 50 50
-82 1 27 200 1.5:1 20 10 20
-30 -50 -30 -80 16 400 2.0:1 35 175 600 50 50
40 2.5:1 -50 0 WR-28 30 0 30 Min. 85 95 3.50 x 1.25 x 0.40
40 2.5:1 -50
dBc V dB V dB % % inches
5
0 WR-28 NA NA NA 85 95 3.50 x 1.25 x 0.40
5
5
8-17
DRT1-38XX Typical Performance
25 T = +25C T = -30C T = +70C 41 600
23
40
21
FREQUENCY (GHz)
TUNING VOLTAGE
500
39 400 38 MODULATION SENSITIVITY
19 Spec Min 17
37
300
15 36.5
37.5
38.5
39.5
40.5
36 2
4
6
8
10
12
200 14
FREQUENCY (GHz)
TUNING VOLTAGE (V)
Figure 1. Power Out vs. Frequency.
0
Figure 2. Tuning Voltage vs. Frequency and Modulation Sensitivity.
-20
-40
ATTENUATION (dB)
-10
-20
dBc (Hz)
-60
-80
-30
-100
-40 0 1 2 3 4 5 ATTENUATOR VOLTAGE
-120 1 10 100 1000 KHz Offset from Carrier
Figure 3. Dynamic Range Adjust.
Figure 4. Phase Noise at 40 GHz vs. KHz Offset from Carrier.
MAIN TUNING SENSITIVITY (MHz/V)
P OUT (dBm)
Powering Up Instructions
The -5 volts must be applied to the transmitter module before applying the +5 volts. Likewise when shutting down the transmitter module the +5 volts must be removed before the -5 volts is
turned off. The +10 volts can be turned on in any sequence. Failure to follow this procedure could cause permanent damage to the module.
Mounting Instructions
Case must be mounted firmly, with screws, to an adequate metallic structure that has sufficient thermal properties to maintain the module case at a temperature not to exceed 70C.
Product Options
Specify part number followed by option. For example:
DR T 1 - 38 X X
Model Number Prefix = Digital Radio T = Transmitter Module Internal Use 1 = No Attenuator 2 = With Attenuator 38 = 37 to 40 GHz Frequency Band 3 = WR-28 Waveguide Connector
8-18
Case Dimensions
H
DRTI-38XX S/N XXXX
1.25
GND MOD TUNE +5V DIV GND DIV OUT +10V +5V PA -5V DET ATTEN GND
12x .20 3.50 .40 REF
1.89 .65 10x .100
.40 MAX 12x .22
12x O .025
SEE DETAIL A
2.70 .125 6x O .120 THRU
.670
4x 4-40 UNC-2B .110 .250 .500
.445
.500
.224
.445
.500
.112 .328
2.430 2.70
.120 .700
DETAIL A
8-19

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