Low switch on resistance is critical in this application, and the ADG1611 has the industry’s lowest R ON (1 Ω typical) and is available in the smallest package, a 16-lead, 4 mm × 4 mm LFCSP. The gain values are set by controlling the external gain setting resistor value, R G, with the four SPST switches, which are connected to four precision resistors. This circuit provides a programmable gain function using a quad SPST switch ( ADG1611) and a resistor-programmable instrumen-tation amplifier ( AD620). This is achieved by implementing a programmable gain amplifier circuit. In order to get the most from an ADC, the maximum input signal should match its full-scale voltage. Femtocell/picocell/microcell base stationsĭata acquisition systems with wide dynamic range often need some method for adjusting the input signal level to the analog-to-digital converter (ADC).Transmit beamforming and receive angle of arrival detection.General purpose design suitable for any software-designed radio application.Additionally the AD-FMCOMMS5-EBZ allows for both AD9361 devices to receive an on-board generated external LO signal, which can provide improved RF performance.
The providing APIs also support full independent device configuration of the two AD9361s.īecause the AD-FMCOMMS5-EBZ supports both narrow and wideband input and output connectivity, it provides RF engineers the ability to connect the AD9361 to a RF test bench (vector signal analyzer, signal generator, etc.) and measure narrowband performance, as well as providing software and system engineers the ability to quickly prototype across the full 6 GHz operating range. This switch matrix hardware, combined with the Analog Devices supplied API software, allow for a full digital and RF synchronization between the two AD9361s. The AD-FMCOMMS5-EBZ also contains dual ADG918 SPDT switches, which create a calibration matrix between the two AD9361s. The AD-FMCOMMS5-EBZ board has both wideband channels covering the full 6 GHz range, as well as narrowband channels matched to 2.4GHz. This platform is intended to enable the prototyping and development of many software defined radio applications, such as active antennas, transmit beamforming, and receive angle of arrival systems. The AD-FMCOMMS5-EBZ supports dual AD9361 devices, allowing for the creation of a 4x4 MIMO system. The AD9361 is a high performance, highly integrated RF transceiver that operates from 70 MHz to 6 GHz, and supports bandwidths from less than 200 kHz to 56 MHz. The AD-FMCOMMS5-EBZ is a high-speed analog module designed to showcase the AD9361 in multiple-input, multiple-output (MIMO) applications.