DIGITAL TO ANALOGUE CONVERTER WITH REFERENCE SIGNAL AND DMETHOD FOR CONVERTING DIGITAL TO ANALOGUE

A digital to analogue converter includes an output that provides a pulse width modulated signal of a predetermined duty cycle that may be used as a reference signal (v/2) to compensate for variations in the operation of the rest of the digital to analogue circuit. The digital to analogue converter h...

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Bibliographic Details
Main Author FLYNN DAVID WALTER
Format Patent
LanguageEnglish
Published 18.07.2005
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRICITY
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Summary:A digital to analogue converter includes an output that provides a pulse width modulated signal of a predetermined duty cycle that may be used as a reference signal (v/2) to compensate for variations in the operation of the rest of the digital to analogue circuit. The digital to analogue converter has a plurality of output stages (46). Each output stage (46) includes a tri-state buffer (54) that outputs an on-signal, an off- signal or a pulse width modulated signal PWM that is selected by a multiplexer (52) that operates under control of a chord decoder (50) that is responsive to exponent bits within the input digital signal value. If a pulse width modulated signal is selected, then its duty cycle is controlled by a pulse width modulated decoder (48) that is responsive to mantissa bits within the input digital signal value.
Bibliography:Application Number: KR20057012056