Complex Tuner
Features
- Designed for maximum speed (fMAX > 140 - 260 MHz, depending on device family)
- Optimized for 10-bit input and output datapath word widths (others on request)
- Variable tuning frequency with parameterized frequency word width
- Optimized for Altera® ACEX® 1K, FLEX 10K®, APEX™ 20K & Mercury™ devices
- Ideal for the following applications:
- Digital tuners
- Digital modulators/demodulators
- Complex arithmetic
- Wireless & wired telecommunications systems
Block Diagram
Figure 1 shows the block diagram for the megafunction.
Description
The CommStack Complex Tuner megafunction translates a complex digital signal from one frequency spectrum to another. This is useful where the tuner input frequency determines the frequency difference. The input frequency may be positive or negative and may be fixed or specified by other circuitry in real time.
The Complex Tuner megafunction can be used in a variety of digital tuner and modem applications, with the input signal in almost any format (e.g., AM, BPSK, QPSK, GMSK, 8-PSK, OFDM, or 16- to 256-QAM).
The datapath is optimized for 10-bit inputs and outputs, but other datapath word widths may be implemented on a customized basis at nominal cost. Additional precision is implemented in the multipliers and output adders to maintain 10-bit accuracy in each component of the complex product. The tuner frequency input is parameterized to support frequency word widths of 10 bits to 40 bits or more. The frequency input may be updated in real time, i.e., as a result of a digital PLL tracking a reference frequency input.
With performance from 140 Mbps to over 260 Mbps, depending on device family, CommStack's Complex Tuner megafunction provides the high speed required in digital signal processing (DSP) applications.
Device Utilization Examples
Table 1 lists the typical device utilization results for the megafunction.
| Table 1: Typical Device Utilization for Megafunction |
| Device |
Speed Grade |
Logic Cells |
EABs (1) |
fMAX (typical) |
Frequency Word Size |
EP1K100,
EPF10K100E |
-1 |
986 |
2,4 |
142 MHz |
36 |
| EP20K100E |
-1 |
1002 |
2 |
144 MHz |
36 |
| EP20K100C |
-7 |
1002 |
2 |
180 MHz |
36 |
| EP1M120 |
-5 |
1002 |
2 |
263 MHz |
36 |
Note:
- EABs = Embedded array blocks
Contact Information
For additional information, contact:
CommStack, Inc.
72 Fairfax Avenue
Atherton, CA 94027
Phone: (650) 701-0939
E-mail: info@commstack.com
Internet: http://www.commstack.com
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