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:
Jul. 30, 2019
Filed:
Jun. 06, 2018
Nxp B.v., Eindhoven, NL;
Marco Berkhout, Tiel, NL;
NXP B.V., Eindhoven, NL;
Abstract
An amplifier circuit comprising: a delta-PWM-modulator, a three-level-DAC, a loop-integrator, and a comparator. The delta-PWM-modulator receives a digital-input-signal; and processes the digital-input-signal and a modulator-triangular-signal to generate a delta-pulse-width-modulation-signal. The delta-pulse-width-modulation-signal is representative of the difference between a square-wave-carrier-signal and a digital-pulse-width-modulation of the digital-input-signal. The three-level-DAC receives the delta-pulse-width-modulation-signal from the delta-PWM-modulator and provides a three-level-analog-signal. The loop-integrator comprises: a virtual-ground-node-terminal configured to receive: (i) the three-level-analog-signal from the three-level DAC; and (ii) a feedback-signal from an output stage of the amplifier circuit via a feedback loop; and an integrator-output-terminal configured to provide a loop-integrator-output-signal. The comparator comprises a comparator-input-terminal configured to receive the loop-integrator-output-signal; a comparator-reference-terminal configured to receive a triangular-reference-signal that corresponds to the integral of the square-wave-carrier-signal; and a comparator-output-terminal configured to provide a drive-signal suitable for driving an output-stage of the amplifier circuit.