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PMC module offers two operation modes

Posted: 03 Nov 2008     Print Version  Bookmark and Share

Keywords:digital down converter  PMC module  IF signals  A/D converter 

Model 7153

Pentek, Inc. has introduced its Model 7153 digital down converter (DDC), a four-channel, high-speed digitiser PMC module designed for processing base band RF or IF signals from a communications receiver. This is the only available product of its kind that employs the new ADS5485 A/D converter just released by Texas Instruments, says Pentek.

Four of these 200 MHz, 16-bit monolithic A/Ds in the front end of the Model 7153 deliver a previously unattainable combination of speed and resolution. In addition, these new A/Ds exhibit a signal-to-noise ratio of 75 dBFS and a spurious-free dynamic range of 87 dBc at a 70 MHz input frequency.

The Model 7153 DDC offers two modes of operation. The two-channel DDC mode sacrifices two DDC channels to boost the maximum decimation to 65,536 and extend the lower bandwidth limit down to 3kHz. The four-channel DDC mode provides an independently programmable decimation range from two to 256 on each DDC, covering signal bandwidths from about 700kHz to 90 MHz.

Switching between modes is invoked through firmware. In either mode, the user can independently select any one of the four A/Ds as the source for each DDC channel. With four A/Ds and four wideband DDCs, the Model 7153 is ideal for high-bandwidth radar and communication systems such as wideband CDMA, UMTS, SRW, LTE and 4G wireless.

In addition to synchronous sampling and DDC for all four channels, the Model 7153 provides independent control of gain and phase for each DDC and includes a summation block for the four DDC outputs.

For larger multi-channel systems, multiple Model 7153s can be synchronised via the front-panel LVPECL clock and sync bus. The DDC summation block includes high-speed serial links to the XMC connector for input and output ports. This supports daisy-chain summation across multiple modules to greatly simplify beamforming applications having eight or more antennas. Fully developed on-board IP and provided firmware minimises system integration efforts.

The Model 7153 has four embedded power meters that continuously monitor the average output power of each DDC channel. The power meters are readable by the system processor for measuring and detecting signal energy and for implementing AGC loops. The power meters are capable of interrupting the system processor if the power level goes above or below programmable thresholds. Since the DDCs can be readily tuned across a frequency spectrum of interest, this feature simplifies critical signal-intelligence applications such as a radio scanner searching for energy.

In its native form, the Model 7153 is a PMC module. However, it is also available in PCI format for installation in a desktop PC or on an Intel-based blade server, as well as in 3U and 6U cPCI formats. The Model 7153 will soon be available for PCI Express systems. The Model 7153 PMC module starts at Rs.6.25 lakh ($12,500) for the hardware. Delivery is 10 to 12 weeks ARO.

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