Nokia Mobile Phones Limited

Jan Pingel

Markus Schetelig

Sten Carlsen

Jurgen Hess

Uwe Zwickler

The present invention discloses a device for converting a digital input into an analogue output, comprising means for generating a binary pulse signal in dependence on said digital input, a filter for filtering said binary pulse signal to obtain said analogue output where the level of the analogue output depends on the relation of high and low level pulses of the binary pulse signal during a period and the precision of the analogue output depends on the number of binary pulses during the period. The high and low level pulses in the binary pulse signal are spread through said period.

Digital to analogue converter

A method for adjusting the frequency of an oscillator for a receiver circuit comprising: downconverting a received signal to generate a downconverted signal, counting the number of zero crossings of the downconverted signal over a predefined time interval, determining a correction number of zero crossings based on the data of the downconverted signal over the predefined time interval, determining a corrected number of zero crossings for the received signal based on the counted number of zero crossings and the correction number of zero crossings, adjusting the frequency of the oscillator based on the corrected number of zero crossings.

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Bochum, Germany

Jan Pingel