Document Outline
- List of Figures
- 1. Power Out vs. Frequency.
- 2. Tuning Voltage vs. Frequency and Modulation Sensitivity
- 3. Dynamic Range Adjust
- 4. Phase Noise at 40 GHz vs. KHz Offset from Carrier
- Features
- Block Diagrams
- Description
- Applications
- DRT1-38XX Absolute Maximum Ratings (TA = -30 to +70C)
- Electrical Characteristics
- DRT1-38XX Typical Performance
- Powering Up Instructions
- Product Options
- Mounting Instructions
- Case Dimensions
8-16
Digital Radio Transmitter Modules
for 37 to 40 GHz
Technical Data
Description
This digital radio transmitter
module is designed for medium
data rate point to point communi-
cation systems operating at
38 GHz. This module offers
excellent phase noise perfor-
mance 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.
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
DRT1-38XX
Block Diagrams
MMIC
Mute
BPF
MMIC
Detector
Signal
Sample
Output
Tuning
Voltage
Modulation Input
Transmitter Module Without Attenuator
RF Out 37
to 40 GHz
BPF
LO
X4
+16
X2
AMP
AMP
MMIC
Mute
BPF
MMIC
Detector
Attenuator
Attenuator
Control
Signal
Sample
Output
Tuning
Voltage
Modulation Input
Transmitter Module With Attenuator
RF Out 37
to 40 GHz
BPF
LO
X4
+16
X2
AMP
AMP
MMIC
AMP
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 -30
C to
+70
C. Included within the
transmitter module is a muting
function to reduce output power
by 50 dB for "hot standby" appli-
cations. An internal voltage
controlled attenuator function is
optional allowing for 30 dB
dynamic range adjustment.
5965-5089E
8-17
DRT1-38XX Absolute Maximum Ratings (T
A
= -30 to +70C)
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
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
DRT1-3823
DRT1-3813
Parameters
Units
Min.
Typ.
Max.
Min.
Typ.
Max.
RF Tuning Range
GHz
37
40
37
40
Operating Temperature Range
C
-30
70
-30
70
Storage Temperature Range
C
-45
85
-45
85
RF Power Output
dBm
18
19
18
19
Sample Out Frequency
MHz
289
313
289
313
Sample Out Power
dBm
-10
0
-10
0
Detected Out
V
0.4
2
0.4
2
Harmonics and Sub-Harmonics
dBc
-30
-30
from 2.65 to 55 GHz from carrier
[1]
Spurious Output
from 2.65 - 55 GHz
[1]
dBc
-30
-30
@ fo
1.0 GHz
dBc
-50
-50
@ prescaler output frequency
dBc
-30
-30
Phase Noise @ 100 KHz
dBc
-82
-80
-82
-80
Tuning Voltage
V
1
16
1
16
Input Capacitance, Nom
pf
27
27
Main Tuning Sensitivity
MHz/V
200
400
200
400
Main Tuning Sensitivity Variation
1.5:1
2.0:1
1.5:1
2.0:1
Modulation Bandwidth
MHz
20
20
Modulation Sensitivity
MHz/V
10
35
10
35
Modulation Sensitivity Variation
%
20
20
DC Circuit Power +10 Volts
mA
175
175
+5 Volts
mA
975
600
-5 Volts
mA
50
50
Frequency Pushing on +10V Line
MHz/V
40
50
40
50
based on
0.2V variation
VSWR @ Full Power Output
[2]
2.5:1
2.5:1
Mute Control
dBc
-50
-50
Mute Control Range
V
0
5
0
5
RF Connector
WR-28
WR-28
Attenuator Range
dB
30
NA
Attenuator Control Voltage
V
0
5
NA
RF Output Dynamic Range
dB
30 Min.
NA
Humidity Non Condensing
%
85
85
Condensing
%
95
95
Case Size
inches
3.50 x 1.25 x 0.40
3.50 x 1.25 x 0.40
Notes:
1. Tested only to 50 GHz
2. Module is unconditionally stable with this load VSWR of 2.0:1
8-18
DRT1-38XX Typical Performance
Powering Up Instructions
The -5 volts must be applied to the
transmitter module before
applying the +5 volts. Likewise
when shutting down the transmit-
ter module the +5 volts must be
removed before the -5 volts is
Mounting Instructions
Case must be mounted firmly,
with screws, to an adequate
metallic structure that has suffi-
cient thermal properties to
maintain the module case at a
temperature not to exceed 70
C.
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
3 = WR-28 Waveguide Connector
1 = No Attenuator
2 = With Attenuator
38 = 37 to 40 GHz Frequency Band
Figure 1. Power Out vs. Frequency.
1
10
100
1000
KHz Offset from Carrier
Figure 4. Phase Noise at 40 GHz vs.
KHz Offset from Carrier.
-120
-80
-100
-20
-60
-40
dBc
(Hz)
2
4
6
8
10
12
14
TUNING VOLTAGE (V)
Figure 2. Tuning Voltage vs. Frequency
and Modulation Sensitivity.
400
300
500
200
600
FREQUENCY
(GHz)
MAIN TUNING SENSITIVITY (MHz/V)
FREQUENCY (GHz)
P
OUT
(dBm)
36
38
37
41
40
39
Figure 3. Dynamic Range Adjust.
ATTENUATION
(dB)
ATTENUATOR VOLTAGE
-40
-30
-20
-10
0
0
2
3
4
1
5
15
17
19
23
21
25
36.5
37.5
38.5
39.5
40.5
T = +25
C
T = 30
C
T = +70
C
Spec Min
TUNING VOLTAGE
MODULATION
SENSITIVITY
turned off. The +10 volts can be
turned on in any sequence. Failure
to follow this procedure could
cause permanent damage to the
module.
8-19
Case Dimensions
1.25
12x .20
3.50
.65
10x .100
1.89
2.70
2.70
.700
.120
12x .22
12x .025
.40 REF
.670
.112
.500
.250
.224
.328
DETAIL A
SEE DETAIL A
2.430
6x
.125
.120
THRU
.445
.500
.500
.445
GND
GND
+5V PA
MOD
ATTEN
TUNE
+5V DIV
GND
DET
DRTI-38XX
S/N XXXX
+10V
DIV OUT
5V
H
.40 MAX
4x 4-40 UNC-2B
.110
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