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(v1.00) May 26, 2004

NCO - 35189 rf engines

Numerically Controlled Oscillator Cores NCO Product Specification

OVERVIEW

This document describes RFEL's Numerically Controlled Oscillator (NCO) core. This core provides interleaved complex sinusoidal outputs in continuous real time, with no gaps in the data, at complex data rates of up to 100MS/s. An alternative variant of the core provides real or complex sinusoidal output at data rates of up to 200MS/s. Numerically controlled oscillators are a silicon efficient means of generating sinusoidal signals with very low quantisation spurs. They are useful in situations where a continuous phase sinusoidal signal with variable frequency is required. An NCO can be combined with a complex multiplier to provide a frequency shift to an existing complex signal, for instance in correcting frequency offset in a communications signal. RFEL's NCO core is intended for use in applications where processing speed is critical and optimum use of available silicon is required. The core is available for licence in netlist form as a component ready to be combined with customer’s own IP.

FEATURES

? Continuous interleaved complex sinusoidal data at up to 100MS/s ? Continuous real or complex sinusoidal outputs at up to 200MS/s ? Fully pipelined design ? Targeted at Xilinx and Altera FPGA families ? Bit-widths adjustable at factory ? Fully bit-true parameterisable models are available

APPLICATIONS

? Frequency shifting in variable filter banks ? Correction of frequency offset in communications systems ? Electronic warfare (radar, sonar, surveillance) ? Medical instrumentation ? Test instrumentation ? Real-time spectral analysis The NCO is most often used to provide fine frequency calibration for wideband signals. © rf engines limited all rights reserved http://www.rfel.com Tel: +44(0)1983 550330