Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

1998-04-22

2000-05-09

Le, Dinh

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327106, 327105, 327113, 708271, H03B 2100

Patent

active

060609176

ABSTRACT:
A frequency synthesizer comprises a direct digital frequency synthesizer (DDFS), which provides in-phase and quadrature sinewave signals at a preset frequency from digital analogue converters respectively, and a balanced mixer. The balanced mixer provides an output signal having a carrier frequency twice that provided by DDFS and reduced levels of spurious signals. A signal having a desired frequency is generated by controlling the DDFS to generate sinewave output signals at half the desired frequency. The reduced levels of spurious signals obtained by the arrangement allows improved signals for use in, for example, local oscillator applications.

REFERENCES:
patent: 4454486 (1984-06-01), Hassun et al.
patent: 5077546 (1991-12-01), Carfi et al.
patent: 5304938 (1994-04-01), Gregory et al.
patent: 5521533 (1996-05-01), Swanke
patent: 5661424 (1997-08-01), Tang
Kishner, L. J., et al., "An 800-MHZX Monolithic Gaas HBT Serrodyne Modulator", IEEE Journal of Solid-State Circuits, vol. 30, No. 10, Oct. 1, 1995, pp. 1041-1050.
Nicholas, H. T., et al., "An Analysis of the Output Spectrum of Direct Digital Frequency Synthesizers in the Presence of Phase-Accumulator Truncation", Proceedings of the 41st Annual Frequency Symposium, 1987, pp. 495-502, Philadelphia.

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