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A Novel DDS-PLL Hybrid Structure to Generate the LFM Signal

Authors:
Zhiyong Zhao
Xiangyang Li
Wenge Chang
Gaowei Jia

Keywords: DDS-PLL Hybrid; Frequency Sweeping; Fast-locking

Abstract:
The signal generator with Direct Digital Synthesizer Phase Locked Loop (DDS-PLL) Hybrid structure generates the signal with the qualities of the wide bandwidth and high frequency resolution. The long acquisition time in the PLL limits its applications. A novel generator structure is proposed by adding the sweeping voltage circuitry to the classical DDS-PLL Hybrid in order to accelerate the acquisition speed. A test circuitry is designed to testify the novel structure. The measured results indicate that the acquisition time is reduced to be 2.175μs and 1.032μs corresponding to 1MHz and 2MHz loop bandwidth respectively; the pulse compression result is very good where the main lobe width remains as ideal, Peak Side Lobe Ratio (PSLR) is better than -38dB, and the Integrated Side Lobe Ratio (ISLR) is better than -9.5dB.

Pages: 58 to 62

Copyright: Copyright (c) IARIA, 2013

Publication date: April 21, 2013

Published in: conference

ISSN: 2308-4480

ISBN: 978-1-61208-264-6

Location: Venice, Italy

Dates: from April 21, 2013 to April 26, 2013