Datasheet DRT1-3823, DRT1-3813, DRT1-2321, DRT1-2312, DRT1-2311 Datasheet (HP)

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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

Block Diagrams

Transmitter Module Without Attenuator

Modulation Input

Tuning Voltage

LO X4

Signal

+16

Sample Output

Transmitter Module With Attenuator

Modulation Input

Tuning Voltage

LO X4

Signal

+16

Sample Output

BPF MMIC

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.

BPF

X2AMP AMP

BPF

X2AMP

MMIC

AMP

MMIC

AMP

Mute

Detector

Attenuator

Detector

RF Out 37 to 40 GHz

Attenuator

Control

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” applications. An internal voltage controlled attenuator function is optional allowing for 30 dB dynamic range adjustment.

5965-5089E

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DRT1-38XX Absolute Maximum Ratings (T

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

= -30 to +70ºC)

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 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 Spurious Output from 2.65 - 55 GHz

@ 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 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 Humidity Non Condensing % 85 85 Condensing % 95 95 Case Size inches

Notes:

1. Tested only to 50 GHz

2. Module is unconditionally stable with this load VSWR of 2.0:1

[1]

[2]

[1]

Units Min. Typ. Max. Min. Typ. Max.

d Bc -30 -30

dB 30 Min.

DRT1-3823 DRT1-3813

2.5:1 2.5:1

3.50 x 1.25 x 0.40 3.50 x 1.25 x 0.40

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DRT1-38XX Typical Performance

T = +25°C T = –30°C

T = +70°C

(dBm)

OUT

Spec Min

36.5 37.5 38.5 39.5 40.5 FREQUENCY (GHz)

Figure 1. Power Out vs. Frequency.

-10

(dB)

-20

ATTENUATION

-30

(GHz)

FREQUENCY

2 4 6 8 10 12 14

TUNING VOLTAGE

MODULATION

SENSITIVITY

TUNING VOLTAGE (V)

600

500

400

300

200

Figure 2. Tuning Voltage vs. Frequency and Modulation Sensitivity.

-20

-40

-60

(Hz) dBc

-80

-100

MAIN TUNING SENSITIVITY (MHz/V)

-40 023415

ATTENUATOR VOLTAGE

Figure 3. Dynamic Range Adjust.

-120 1 10 100 1000

KHz Offset from Carrier

Figure 4. Phase Noise at 40 GHz vs. KHz Offset from Carrier.

Powering Up Instructions

The -5 volts must be applied to the transmitter module before applying the +5 volts. Likewise when shutting down the transmit-

turned off. The +10␣ volts can be turned on in any sequence. Failure to follow this procedure could cause permanent damage to the

module. ter module the +5␣ volts must be removed before the -5 volts is

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

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 70° C.

3 = WR-28 Waveguide Connector

1 = No Attenuator 2 = With Attenuator

38 = 37 to 40 GHz Frequency Band

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Case Dimensions

.65

DRTI-38XX S/N XXXX

TUNE

MOD

+5V DIV

GND

1.89 10x .100

+10V

DIV OUT

3.50

–5V

+5V PA

DET

GND

ATTEN

1.25

12x .20

.40 REF

.224

.670

.112

DETAIL A

.250

.328

12x .22

4x 4-40 UNC-2B

.110

.500

2.430

2.70

12x Ø .025

.120 .700

.40 MAX

SEE DETAIL A

.125

6x Ø

.120

.445