Apparatus and method for converting analog signal to pulse-width-modulated signal
AssigneeNational Semiconductor Corporation
InventorArthur Joseph Kalb
Life of this patent
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Abstract
A circuit for converting an analog signal to a discrete pulse-width-modulated (PWM) signal uses a delta-sigma amplifier and a discrete PWM stage to produce a discrete PWM output signal having lower in-band signal noise then a PDM system and a lower signal distortion then a continuous PWM system. A multiple bit quantization stage drives the discrete PWM stage.
Claims57
An apparatus including a circuit for converting an analog signal to a pulse-width-modulated signal, comprising:
- an integration stage configured to receive, combine and integrate an analog input signal and a set of one or more feedback signals and in accordance therewith provide a set of one or more integrated signals;
- a modulation stage, coupled to said integration stage, configured to receive and modulate a final portion of said set of one or more integrated signals and in accordance therewith provide a discrete time pulse width modulated signal;
- and
- a first feedback stage, coupled between said modulation stage and said integration stage, configured to receive said discrete time pulse width modulated signal and in accordance therewith provide a first portion of said set of one or more feedback signals.
An apparatus including a circuit for converting an analog signal to a pulse-width-modulated signal, comprising:
- integration means for receiving, combining and integrating an analog input signal and a set of one or more feedback signals and in accordance therewith providing a set of one or more integrated signals;
- modulation means for receiving and modulating a final portion of said set of one or more integrated signals and in accordance therewith providing a discrete time pulse width modulated signal;
- and
- first feedback means for receiving said discrete time pulse width modulated signal and in accordance therewith providing a first portion of said set of one or more feedback signals.
A method for converting an analog signal to a pulse-width-modulated signal, comprising the steps of:
- receiving, combining and integrating an analog input signal and a set of one or more feedback signals and in accordance therewith generating a set of one or more integrated signals;
- generating a discrete time pulse width modulated signal in accordance with said set of one or more integrated signals;
- and
- feeding back said discrete time pulse width modulated signal as a first portion of said set of one or more feedback signals.
Dependencies are inferred from the claim text.