Direct-Sequence Spread-Spectrum Modulator 60 Mchip/s

KEY FEATURES

Direct Sequence Spread-Spectrum (DS-SS) modulator

• Programmable chip rates up to 60 Mchip/s
• Spreading factor: 3 to 65535
• Spreading codes: Maximal length sequences, Gold codes, Barker codes, GPS C/A codes
• GPS C/A codes
• Symbol rate selection fully independent of chip rate
• Code modulation: BPSK/QPSK with output spectral shaping filter: raised cosine square root filter with 20% rolloff. Filter can be bypassed
• Input for an external, higher-stability 10 MHz frequency reference.

Internal generation of pseudo-random bit stream and unmodulated carrier for test purposes

Built-in channel impairments generation:

• additive white Gaussian noise
• frequency offset (Doppler)

ComScope-enabled: key internal signals can be captured in real-time and displayed on a host computer

Connectorized 3”x 3” module for ease of prototyping. High-speed 98-pin PCIe connectors (left, right). Single 5V supply with reverse voltage and overvoltage protection. Interfaces with 3.3V LVTTL logic.

ComBlock COMPATIBILITY LIST

Left	Right
Most ComBlocks	Most ComBlocks
COM-5102 Gigabit Ethernet + HDMI Video In/Out interface card	COM-2001 Digital to Analog conversion, 2*10-bit 125MS/s
COM-1509 Error correction codec	COM-2802 0-360 MHz DDS modulator
COM-7003 Turbo code encoder	COM-3504 Dual Analog<->Digital Conversions, 16-bit 250MS/s DACs, 12-bit 150 MS/s ADCs
COM-8001 Pattern generator 256MB/1GB	COM-1518 Direct sequence spread-spectrum demodulator (digital back-to-back)
	COM-1824 Channel emulator (Doppler, Delay, Fading, Noise)