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A periodical frequency synthesizer for a 2.4-GHz fast frequency hopping transceiver

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2 Author(s)
Uusikartano, R. ; Digital & Comput. Syst. Lab., Tampere Univ. of Technol., Finland ; Niittylahti, J.

In this paper, a compact architecture of a digital frequency synthesizer for a 2.4-GHz fast frequency hopping radio modem is presented. The synthesizer is designed for generating 12-bit quadrature carrier signals from 50 to 90 MHz in 500 kHz steps. The phase-to-amplitude conversion in the synthesizer is performed with a highly compressed look-up table (LUT). The read-only memory compression is based on the property that only a limited set of discrete frequencies is needed. Simulation and synthesis results for a VHDL-implementation of the architecture are given. In addition, the proposed architecture is compared to a traditional look-up based direct digital frequency synthesizer with similar performance. Layouts were generated for both designs using a 3.3-V 4-metal 0.35-μm n-well standard cell CMOS technology. The proposed synthesizer was found to be 59% smaller in area than the reference design

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:48 ,  Issue: 10 )