Digital Radio Transmitter Modules for 21.2 to 23.6␣ GHz Technical Data DRT1-23XX 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 23␣ GHz. This module offers excellent phase noise performance 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. • 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/SMA RF Output • Detected Output Block Diagrams Transmitter Module Without Attenuator Modulation Input Tuning Voltage BPF LO Signal Sample Output X4 MMIC AMP BPF X2 MMIC AMP RF Out 21.2 to 23.6 GHz +4 Mute Detector Transmitter Module With Attenuator Modulation Input Tuning Voltage MMIC BPF LO X4 MMIC AMP BPF X2 AMP Attenuator RF Out 21.2 to 23.6 GHz MMIC Signal Sample Output +4 Mute 5965-5090E Detector 8-12 Attenuator Control 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 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°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. DRT1-23XX 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 @ fo ± sample out frequency Phase Noise @ 100 KHz Tuning Voltage Input Capacitance, Nom Main Tuning Sensitivity Main Tuning Sensitivity Variation Modulation Bandwidth Modulation Sensitivity Modulation Sensitivity Variation over any 300 MHz DC Circuit Power +10 Volts +5 Volts -5 Volts Frequency Pushing on +10V Line based on ± 0.2V variation Return Loss @ 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 GHz °C °C dBm MHz dBm V dBc dBc dBc dBc dBc V pf MHz/V MHz MHz/V DRT1-2321 or DRT1-2322 Min. Typ. Max. 21.2 -30 -45 19 663 -10 0.4 20 738 0 2 -30 -85 1 27 260 1.5:1 20 7 -30 -50 -40 -82 16 21.2 -30 -45 19 663 -10 0.4 mA mA mA MHz/V dB dBc V 40 7 175 975 50 50 5 30 Min. 85 95 3.50 x 1.25 x 0.40 % % inches Tested only to 50 GHz Module is unconditionally stable with this load VSWR of 2.0:1 8-13 335 2.0:1 25 40 175 600 50 50 10 -50 5 30 0 -30 -50 -40 -82 16 1.15:1 WR 42 or Coax dB V 738 0 2 -30 27 260 1.5:1 20 10 -50 0 20 -85 335 2.0:1 25 23.6 70 85 1 1.15:1 Notes: 1. 2. 23.6 70 85 DRT1-2311 or DRT1-2312 Min. Typ. Max. 0 5 WR 42 or Coax NA NA NA 85 95 3.50 x 1.25 x 0.40 DRT1-23XX Typical Performance 25 24 300 MODULATION SENSITIVITY 21 19 Spec Min T = +25°C T = –30°C T = +70°C 17 15 21 22 23 250 23 200 TUNING VOLTAGE 22 150 21 2 24 4 6 8 10 12 14 MAIN TUNING (MHz/V) FREQUENCY (GHz) P OUT (dBm) 23 100 16 TUNING VOLTAGE (V) FREQUENCY (GHz) Figure 1. Power Out vs. Frequency. Figure 2. Tuning Voltage vs. Frequency and Modulation Sensitivity. 0 -40 dBc (Hz) ATTENUATION (dB) -60 -10 -20 -30 -80 -100 -120 -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 receiver module before applying the +5 volts. Likewise when shutting down the receiver module the +5␣ volts must be removed before the -5 volts is -140 1 10 100 1000 KHz Offset from Carrier Figure 4. Phase Noise at 23 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 – 23 X X Model Number Prefix = Digital Radio 1 = SMA Connector 2 = WR-42 Waveguide Connector T = Transmitter Module 1 = No Attenuator 2 = Attenuator Option Internal Use 23 = 21.2 to 23.6 GHz Frequency Band 8-14 Case Dimensions H DRTI-23XX 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 .670 .170 .250 .420 .500 2.430 .335 .375 .120 2.70 DETAIL A 8-15 .700 .445 .500 .445 .500