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FREE-RUNNING DIELECTRIC RESONATOR OSCILLATORS - ATVA

FREE-RUNNING DIELECTRIC RESONATOR OSCILLATORS - ATVA

TABLE OF CONTENTS

TABLE OF CONTENTS CONTENTS CORPORATE OVERVIEW OSCILLATORS High-Value CONTENTS Phase-Locked Coaxial Resonator Oscillator – BCO Series Phase-Locked Coaxial Resonator Oscillator – DLP Series Fundamental/Multiplied Phase-Locked Coaxial Resonator Oscillator – CP/CPM Series Lowest Noise Phase-Locked Dielectric Resonator Oscillator – DLCRO Series Introduction to DROs Ultra Low-Noise Phase-Locked Dielectric Resonator Oscillator – PLDRO Series Variable Frequency Multi-Source Oscillator – VFS Series Phased-Locked Coaxial Resonator Oscillator – LP Series Multiplied Phase-Locked Coaxial Resonator Oscillator – LPLM Series Phased-Locked Electronically-Tuned Crystal Oscillator Coaxial – PLD Series Oscillator – ETCO Ultra Low-Noise Crystal Oscillator – XTO-05 Series Multiplied Crystal Oscillator to 1 GHz – XTM Series FREE-RUNNING DIELECTRIC RESONATOR OSCILLATORS Mechanically-Tuned Dielectric Resonator Oscillator – DRO Series Temperature Compensated Dielectric Resonator Oscillator – TCDRO Series FREE-RUNNING DIELECTRIC RESONATOR OSCILLATORS Introduction to DROs Mechanically-Tuned Dielectric Resonator Oscillator – DRO Series Temperature Compensated Dielectric Resonator Oscillator – TCDRO Series Electronically-Tuned Coaxial Oscillator – ETCO FREQUENCY SYNTHESIZERS L-Band Frequency Synthesizer – L2LS Series S-Band Frequency Synthesizer – S2LS Series C-Band Frequency Synthesizer – C3LS Series Ku-Band Frequency Synthesizer – Ku3LS Series High Performance Ku- and L-Band Dual Output Synthesizer – CFS Series X-Band Frequency Synthesizer – LNS Series Low Phase Noise SATCOM Synthesizer – MFS Series Octave Wide Frequency Synthesizer – OW Series Fast Switching Synthesizer – SLS Series 93 Multiband Synthesizer – C-, X- , and Ku-Band Series ISO 9001:2000 ORDERING INFORMATION WARRANTY

INTRODUCTION TO DROs INTRODUCTION TO DROs Dielectric Resonator Oscillators (DROs) are microwave oscillators that use a dielectric resonator (DR) as the frequency stabilizing element in order to achieve excellent frequency stability, high Q and very low microphonics. The DR, when used as part of the resonating circuit of any active microwave device, produces a steady state oscillation under the right conditions at the resonant frequency of the DR. DIELECTRIC RESONATOR MAGNETICALLY COUPLED TO DIFFERENT PORTS OF TRANSISTOR USING TRANSMISSION LINE MAGNETIC FIELD DR O/P MATCH OSCILLATOR THEORY AND CIRCUIT DESIGN MITEQ’s DRO circuits utilize both silicon bipolar transistors and GaAs MESFET devices. All microwave oscillators are designed by adding resonating elements (L, C or R) in various configurations to different ports of a transistor. These elements generate a negative resistance at a certain resonant frequency and set the device into oscillation. In the case of a DRO, the resonating element is the DR, which can be modeled electrically as an L, C, R network, as shown in Figure 1. Z i Z o Z i MAGNETIC FIELD DR Z o Z L O/P MATCH Z o/p Z o/p DIELECTRIC RESONATOR ELECTRICAL MODEL FIGURE 2 h d FIGURE 1 The Dielectric Resonator is made of a high dielectric constant (ε = 30 to 80) ceramic material, often barium titanate (Ba 2 Ti 9 O 20 ). This material exhibits a high Q (9000 @ 10 GHz) and low temperature coefficient of frequency (TC to ±6 ppm/°C typical). The cylindrical shape as shown in Figure 1 is the most popular. It has good separation between the desired TEδ(0,1) mode and other higher order resonant modes, making it easier to couple to microstrip circuits, as well as easy to mount. The resonator is magnetically coupled to one or more ports of the transistor using a transmission line, as shown in Figure 2. 1 L1 R1 C1 2 OSCILLATOR FABRICATION TECHNIQUES MITEQ DROs are manufactured using state-of-the-art thin-film hybrid micro-circuit technology. These DROs are suited for applications requiring rugged construction for operation under severe environmental stress. TYPICAL DRO PERFORMANCE SPECIFICATIONS AND APPLICATIONS When comparing different types of oscillators versus a DRO, an engineer may wish to consider the following performance specifications: FREQUENCY ACCURACY AND SETTABILITY The frequency accuracy of a free-running DRO is typically within 500 kHz and can be set to within 100 kHz. FREQUENCY STABILITY ‘ DROs are highly stable free-running oscillators exhibiting low temperature coefficient of frequency drift (typically 4 ppm/°C) and have better stability than free-running cavity oscillators, Gunn diode oscillators or VCOs. 47

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