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ANI-001: Intermodulation Distortion (IMD) Testing of Ferrite Circulators and Isolators

From M/A-COM
 

 
Intermodulation Distortion (IMD) measurements are used to characterize the non-linearity of RF components, including ferrite circulators and isolators. Two CW tones (f1 and f2) are combined and fed into the Device Under Test (DUT). The resulting output is measured on a spectrum analyzer. The third order, and occasionally the fifth order, products are the critical unwanted frequency IMD products that are measured. Figure 1 is a typical block diagram of a forward IMD test stand. M/A Com uses a Agilent 83712B signal generators and Amplifier Research 100W1000M1 amplifiers. The dual isolators provide >50dB of isolation and K&L's six cavity tuneable low pass filters remove system harmonics. The M/ A-Com quad hybrid (QH32-0018-N) gives a further 18dB of isolation between the tones. The Directional Couplers (CH25-0014-10N) must be term inated with a broadband cable load with superior VSWR (<1.1:1). A six cavity notch filter (WRCD800/960 0.2/40- 6EEK) attenuates the fundamental frequencies (f1 and f2) to provide greater dynamic range.
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Product Announcements
DiTom Microwave, Inc. - Broadband Isolators and Circulators
Ditom now offers isolators and circulators for all your broadband needs. (read more)
DiTom Microwave, Inc. - Cellular Isolators In Stock
DiTom is now offering Cellular and PCS Isolators and Circulators in four frequency ranges. Availiable in SMA-Female and Type-N Female Connector configurations. (read more)
DiTom Microwave, Inc. - PCS Circulators
DiTom is now offering Cellular and PCS Isolators and Circulators in four frequency ranges. Availiable in SMA-Female and Type-N Female Connector configurations. (read more)
DiTom Microwave, Inc. - Dual Junction Isolators and Circulators
DiTom now offers a broad range of dual junction isolators and circulators. (read more)
Topics of Interest
Intermodulation distortion (IMD) has become increasingly important in microwave and RF amplifier design. As modulation techniques become more sophisticated, greater performance is required from... (Read More)
Introduction: This application note defines "baseplate temperature" for M=A-COM's circulator/isolator product lines. The choice for base-plate materials and their impact on the power handling... (Read More)
4.3 Receiver Tests Various receiver performance and functional tests are also performed during general design and development as well as for design verification. Some of the more Significant tests... (Read More)
In third generation (3G) mobile communication systems, ultra linear amplification is required for complex modulation formats. Nonlinear amplification yields inter-modulation distortion (IMD) products... (Read More)
Signal distortion is measured by spectrum analyzers and signal analyzers. In communications, distortion must be measured for both the transmitter and receiver. Excessive harmonic distortion at a... (Read More)
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