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High-speed direct digital frequency synthesizers in 0.25-μm CMOS

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4 Author(s)
Strollo, A.G.M. ; Dept. of Electron. & Telecom. Eng., Naples Univ., Italy ; De Caro, D. ; Napoli, E. ; Petra, N.

Two high-speed direct digital frequency synthesizers (DDFS) have been fabricated in CMOS 0.25 μm technology. Both DDFS provides two quadrature phase 12 bit outputs with a spectral purity of 80 dBc. The first circuit reaches a maximum operating frequency of 600 MHz. The second circuit operates up to 480 MHz clock speed while dissipating only 72 μW/MHz. The proposed circuits employ an innovative high-speed architecture for sine and cosine functions approximation, based on a hardware-effective linear interpolation approach name as "dual-slope".

Published in:

Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004

Date of Conference:

3-6 Oct. 2004