Digital Radio Transmitter Modules for 37 to 40␣ GHz Technical Data DRT1-38XX Features Description • Integrated Microwave/ Millimeter-Wave Modules 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. • 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 BPF LO X4 MMIC AMP BPF X2 MMIC AMP RF Out 37 to 40 GHz Signal Sample +16 Output Mute Detector Transmitter Module With Attenuator Modulation Input Tuning Voltage MMIC BPF LO X4 MMIC AMP BPF X2 AMP Attenuator RF Out 37 to 40 GHz MMIC Mute 5965-5089E Detector 8-16 Attenuator Control AMP Signal Sample +16 Output 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. DRT1-38XX Absolute Maximum Ratings (TA = -30 to +70ºC) 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 Units Min. GHz °C °C dBm MHz dBm V dBc 37 -30 -45 18 289 -10 0.4 dBc dBc dBc dBc V pf MHz/V MHz MHz/V % mA mA mA MHz/V dBc V DRT1-3823 Typ. Max. Min. 40 70 85 37 -30 -45 18 289 -10 0.4 19 313 0 2 -30 -82 1 -30 -50 -30 -80 16 1.5:1 20 10 200 35 10 1.5:1 20 175 975 50 50 5 30 Min. 85 95 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 8-17 400 2.0:1 35 40 175 600 50 50 2.5:1 -50 5 30 0 -30 -50 -30 -80 16 20 WR-28 dB V dB % % inches 313 0 2 -30 27 400 2.0:1 2.5:1 -50 0 19 -82 20 40 Max. 40 70 85 1 27 200 DRT1-3813 Typ. 0 5 WR-28 NA NA NA 85 95 3.50 x 1.25 x 0.40 DRT1-38XX Typical Performance 41 T = +25°C T = –30°C T = +70°C 40 FREQUENCY (GHz) P OUT (dBm) 23 600 21 19 Spec Min TUNING VOLTAGE 500 39 400 38 MODULATION SENSITIVITY 37 17 15 36.5 37.5 38.5 39.5 36 2 40.5 4 6 8 10 12 300 MAIN TUNING SENSITIVITY (MHz/V) 25 200 14 TUNING VOLTAGE (V) FREQUENCY (GHz) Figure 1. Power Out vs. Frequency. Figure 2. Tuning Voltage vs. Frequency and Modulation Sensitivity. 0 -20 dBc (Hz) ATTENUATION (dB) -40 -10 -20 -30 -60 -80 -100 -40 0 1 2 3 4 5 ATTENUATOR VOLTAGE Figure 3. Dynamic Range Adjust. 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 -120 1 10 100 1000 KHz Offset from Carrier Figure 4. Phase Noise at 40 GHz vs. KHz Offset from Carrier. 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 70°C. Product Options Specify part number followed by option. For example: DR T 1 – 38 X X Model Number Prefix = Digital Radio 3 = WR-28 Waveguide Connector T = Transmitter Module 1 = No Attenuator 2 = With Attenuator Internal Use 38 = 37 to 40 GHz Frequency Band 8-18 Case Dimensions H DRTI-38XX S/N XXXX +5V PA –5V DET ATTEN GND GND MOD TUNE +5V DIV GND DIV OUT +10V 1.25 12x .20 3.50 .40 REF 1.89 .65 10x .100 .40 MAX 12x .22 12x Ø .025 SEE DETAIL A .125 6x Ø .120 THRU 2.70 .670 4x 4-40 UNC-2B .110 .250 .224 .500 .112 2.430 .328 2.70 DETAIL A 8-19 .120 .700 .445 .500 .445 .500