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公开(公告)号：US20180358934A1
公开(公告)日：2018-12-13
申请号：US15993955
申请日：2018-05-31
Inventor： Ramya BALASUNDARAM , Bhupendra MANOLA , Pradeep DHANANJAY
CPC classification number: H03F1/305 , G06F3/165 , H03F1/52 , H03F3/187 , H03F3/45071 , H03F3/45475 , H03F2200/03 , H03F2200/129 , H03F2200/321 , H03F2200/387 , H03F2203/45151 , H03F2203/45528 , H03F2203/45636
Abstract: An apparatus may include a digital-to-analog converter configured to convert a digital audio input signal into a differential analog input signal with a substantially non-zero common-mode voltage, an amplifier configured to receive the differential analog input signal and generate at an amplifier output a ground-centered output signal from the differential analog input signal, a clamp configured to selectively couple and decouple the amplifier output to a ground voltage, and a controller configured to control the clamp to selectively couple and decouple the amplifier output to a ground voltage responsive to transitions between power states of a device comprising the apparatus and control the differential analog input signal generated by the digital-to-analog converter in order to minimize a level transition current through an output load coupled to the amplifier output during transitions between the power states.
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公开(公告)号：US20180317007A1
公开(公告)日：2018-11-01
申请号：US15926335
申请日：2018-03-20
Inventor： Pradeep DHANANJAY , Bruce E. DUEWER
CPC classification number: H04L25/4927 , H03F1/0227 , H03F1/025 , H03F3/187 , H03F3/213 , H03F2200/03 , H03F2200/331 , H04B14/046 , H04L25/03159 , H04R3/04
Abstract: An apparatus for generating an output signal, may comprise a signal path having an analog signal path portion having an analog magnitude droop, a digital signal path portion having a digital magnitude droop, a digital-to-analog converter for converting the digital input signal into the analog signal, a first digital compensation filter that compensates for the analog magnitude droop, and a second digital compensation filter that compensates for the digital magnitude droop, such that the first digital compensation filter and the second digital compensation filter together compensate for magnitude droop of the signal path to ensure a substantially flat passband response of the signal path.An apparatus may include a delta-sigma modulator for quantization noise shaping of a digital signal, a digital-to-analog converter configured to generate an analog signal from the digital signal, and an amplifier configured to amplify the analog signal and powered from a charge pump, wherein the charge pump is configured to operate at a switching frequency approximately equal to a zero of a modulator noise transfer function of the delta-sigma modulator, such that the impact of charge pump noise on a total harmonic distortion noise of the apparatus is minimized
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公开(公告)号：US20180316525A1
公开(公告)日：2018-11-01
申请号：US15926395
申请日：2018-03-20
Inventor： Pradeep DHANANJAY , Tejasvi DAS , Bhupendra MANOLA , Bruce E. DUEWER
Abstract: An apparatus for generating an output signal, may comprise a signal path having an analog signal path portion having an analog magnitude droop, a digital signal path portion having a digital magnitude droop, a digital-to-analog converter for converting the digital input signal into the analog signal, a first digital compensation filter that compensates for the analog magnitude droop, and a second digital compensation filter that compensates for the digital magnitude droop, such that the first digital compensation filter and the second digital compensation filter together compensate for magnitude droop of the signal path to ensure a substantially flat passband response of the signal path.An apparatus may include a delta-sigma modulator for quantization noise shaping of a digital signal, a digital-to-analog converter configured to generate an analog signal from the digital signal, and an amplifier configured to amplify the analog signal and powered from a charge pump, wherein the charge pump is configured to operate at a switching frequency approximately equal to a zero of a modulator noise transfer function of the delta-sigma modulator, such that the impact of charge pump noise on a total harmonic distortion noise of the apparatus is minimized
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