The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2002
Filed:
Aug. 07, 2000
Brian J. Minnis, Crawley, GB;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A fractional-N frequency synthesizer for use in a transmitter for transmitting TDMA signals, comprises a fourth order sigma-delta modulator( ) having an input for digitized signals, a FIR filter( ) having taps coupled to an output of the sigma-delta modulator, the FIR filter ( ) serving to increase the number of states on its output by one over the number of states on its input which is connected to an output of the sigma-delta modulator, and a phase locked loop(PLL) including a frequency divider( ) with an incremental ratio of 0.5 and having a control input coupled to an output of the FIR filter. The frequency divider ( ) by having an incremental ratio of 0.5 enables the PLL to have a reference oscillator( ) operating at half the sampling frequency of the sigma-delta modulator( ). The frequency synthesizer as a consequence has been found to give a 12 dB improvement in noise level and also continuous tuning can be achieved because the successive groups of three half ratios adjacent tuning ranges made possible by using overlap.
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