Wideband Sigma Delta PLL Modulator

May 28, 2010  //  Posted by: qwcdirect  //  Category: Broadband & Wireless

Due to the increased challenges faced by wireless transceiver designs such as GPRS and HSCSD has brought about the need to have two major requirements in mobile application. These are efficient utilization of frequency spectrum and fast switching high for data rates. This can be attained by use of Wideband Sigma Delta PLL Modulator which is capable of synthesizing frequencies at channel spacing in less time than the reference frequency.

The Wideband Sigma Delta PLL modulator is based on PLL fractional synthesis techniques and the Sigma-Delta modulation. These techniques randomize fractional N spurs and suppress the Sigma-Delta noise at low frequencies thus allowing for wider bandwidth. The technology eliminates the spurs that generate high tones associated with Fractional-n PLL by randomizing the frequency division ratio. Low power and low area techniques have been used to modify the Sigma Delta technique thus reducing the total power consumption in every operation. By use of this technology, the reference frequency will be increased and in turn this will reduce the PLL’s locking time.

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