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:
Jun. 09, 1998
Filed:
Sep. 18, 1996
David Walter Flynn, Cambridge, GB;
Advanced RISC Machines Limited, Cambridge, GB;
Abstract
A digital to analogue converter having 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. A further output provides a pulse width modulated signal of a predetermined duty cycle that may be used as a reference signal to compensate for variations in the operation of the rest of the digital to analogue circuit.