Digital Radio Transmitter Modules
for 21.2 to 23.6 GHz
Technical Data
DRT1-23XX
Features
鈥?Integrated Microwave/
Millimeter-Wave Modules
鈥?Low Phase Noise
鈥?Silicon Bipolar VCO
鈥?Full Band Tuning
鈥?GaAs MMIC Output Stage
鈥?Sample Output for Phase
Locking
鈥?Excellent Tuning Linearity
鈥?30 dB Attenuator
鈥?Waveguide/SMA RF Output
鈥?Detected Output
Description
This digital radio transmitter
module is designed for medium
data rate point to point communi-
cation systems operating at
23 GHz. This module offers
excellent phase noise perfor-
mance and can be easily phase
locked to a frequency reference.
The transmitter module provides
+20 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 23 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 21.2 to 23.6 GHz
band. The source provides close
to 100 mW output power over the
temperature range of -30擄C to
+70擄C. Included within the
transmitter module is a muting
function to reduce output power
by 50 dB for 鈥渉ot standby鈥?appli-
cations. 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
Output
X4
BPF
MMIC
AMP
X2
BPF
MMIC
AMP
RF Out 21.2
to 23.6 GHz
+4
Mute
Detector
Transmitter Module With Attenuator
Modulation Input
Tuning
Voltage
LO
Signal
Sample
Output
X4
BPF
MMIC
AMP
X2
BPF
MMIC
AMP
Attenuator
RF Out 21.2
to 23.6 GHz
MMIC
AMP
Attenuator
Control
+4
Mute
Detector
5965-5090E
8-12
AGILENT
1
2
3
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