The MI-750 Receiver brings together the best of today's microwave receiver technologies to offer a powerful measurement system solution. This unique product provides a significant upgrade to existing receiver subsystems

Features

• Industry leading performance with up to 4 M samples per second
• 135 dB dynamic range and -150 dBm sensitivity
• Selectable digital filtering for enhanced range performance
• Wide frequency range from 10 MHz to 110 GHz
• Smooth upgrade path for MI-1797 receivers
• Flexible modular architecture for system configurability and supportability

The MI-750 has been designed with the latest technology to be the fastest system receiver in the industry. With measurement speeds of 4,000,000 samples/second and built-in data management features, the MI-750 has the throughput capacity to get detailed measurement results that earlier may have been prohibitively slow. Combined with this sampling performance is a world-class RF design offering receiver sensitivity to -150 dBm and enabling a high dynamic range of 135 dB. Even at full speed, useful performance is available with -84 dBm sensitivity at 4 M samples/second and a dynamic range of 69 dB. Accuracy is maintained with high amplitude and phase linearity, while broad RF power management features provide expanded system configurations. For more information about these performance enhancements, see the specifications table below.

The MI-750 has been designed to maximize flexibility across a broad range of applications. For example, the addition of advanced DSP algorithms offer a choice of several digital filter types. These digital filters can optimise the receiver for high dynamic range or best selectivity or improved interference rejection. There is also more flexibility to trade-off the high speed of the instrument for increased dynamic range. A choice of 41 sample rates offers steps of 1.5dB sensitivity. Dynamic LO power equalization provides more versatility in selecting RF cables to remote mixers without requiring LO extenders. Ethernet interfaces for data and control create more options in equipment location and system optimization without sacrificing performance.

The MI-750 also offers a modular design increasing system configuration options. There are five primary module types used in an MI-750 configuration:

• 0.1-26.5 GHz Module - Provides built-in RF capability without external mixing from 0.1 to 26.5 GHz.
• Remote Mixing Module - Provides an external mixer interface for low-loss frequency coverage from 100MHz to 110GHz.
• Advanced Remote Mixing Module - Provides dynamic LO power equalization for maximum remote mixing performance and flexibility.
• Low Frequency Module - Adds very low frequency capability, 10-150 MHz.
• Local Oscillator Module - Provides a built-in LO source.

These configuration options allow a wide variety of performance and the ability to maximize instrument value to meet the goals of a given measurement system. Common configurations include:

The inherent high performance of the MI-750 Receiver, combined with the flexibility of its features and design modularity, allows for the widest possible range of test applications. Some of these include:

High-speed Near-field Antenna Measurements

Planar, cylindrical and spherical near-field measurements all share a common need for processing vast quantities of accurate data. Regardless of the coordinate system, the MI-750 comes with the performance to deliver near-field data at a speed and accuracy that can dramatically change test throughput expectations. The full 4 M samples/sec performance of the MI-750 still offers a measurement dynamic range of 69 dB, so rich and detailed insight into antenna systems can be delivered fast!

High Interference Test Environments

Outdoor Far-Field test ranges have to deal with a dense spectral environment in which measurements must be made. Signals from external emitters must be prevented from causing interference with the measurement, and the outdoor range must not cause interference with other nearby systems. These criteria oppose each other in that if range transmit power is increased sufficiently to limit the effects of interference on the measurement, the range may cause interference to other systems. If low power is used in the range to avoid causing interference to others, system sensitivity drops and measurement performance suffers. The MI-750 is designed to manage this scenario with flexible digital filtering for high selectivity. This allows:

• Lower susceptibility to spurious signals that interfere with the measurement
• Extended system dynamic range
• Reduced measurement uncertainties

Automated Multi-port, Multi-frequency Antenna Testing

Efficient testing of multi-port antennas requires a receiver that supports multiple measurement channels with fast switching between channels. The MI-750 Receiver has the capacity to drive up to two optional MI-3320 Multiplexers, deployed in the transmit or receive signal path, to test up to 16 signal combinations. Rapid multiplexer switching times in the receiver help avoid any degradation of system measurement speed.

Radar, RCS and Pulsed Systems

Several features of the MI-750 have been designed to maintain or enhance system effectiveness for pulse and pulse profile applications. Radar and Radar Cross Section systems are the most common applications with significant pulsed signaling. Some of the receiver's pulse features include:

• 4 MHz Sample rate
• Averaging across the pulse width
• Multiple Pulse Averaging
• External Trigger to start sampling

Specifications

Parameter	MI-750 Family Microwave Receiver
Frequency Range - Standard Optional Sample Rate Average Data Throughput IF Noise Bandwidth	0.1 - 26.5 GHz 0.01 - 110 GHz 1Hz to 4 MHz 110K samples/sec Sample rate x 3
Dynamic Range - 4 M samples/sec 1 M samples/sec 10 K samples/sec 100 samples/sec 1 sample/sec	69 dB 75 dB 95 dB 115 dB 135 dB
Sensitivity - 1 sample/sec	-150 dBm
Linearity- Phase Amplitude	0.4 deg/10dB 0.05 dB/10dB
Frequency switching speed	Receiver, 0.1-26.5 GHz
Frequency list size	Receiver, 0.01-26.5 GHz (Low Frequency)
Multi-channel measurement speed	1/sample rate + mux switching time
Modes	CW, Pulsed, Tracking
Pulse width minimum	240 ns
Pulse repetition frequency	15 Hz to 4 MHz

For more information see MI-750_Brochure.pdf