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公开(公告)号：US20230132510A1
公开(公告)日：2023-05-04
申请号：US17980146
申请日：2022-11-03
Inventor： John L. MELANSON , Lingli ZHANG , Paul M. ASTRACHAN , James KELTON
IPC: H03M1/06
Abstract: A digital-to-analog converter may include an integrator, an input network comprising a plurality of parallel taps, each member of the plurality of parallel taps having a signal delay such that at least two of the signal delays of the members of the plurality of parallel taps are different, and wherein each member of the plurality of parallel taps is coupled between an input of the digital-to-analog converter and an input of the integrator, and control circuitry configured to selectively enable and disable particular members of the plurality of parallel taps in order to program an effective input resistance of the input network to control an analog gain of the digital-to-analog converter, such that the control circuitry enables an even number of members at a time, with half of such enabled members in a first group and half of such enabled members in a second group.
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公开(公告)号：US20230139547A1
公开(公告)日：2023-05-04
申请号：US17980105
申请日：2022-11-03
Inventor： Paul M. ASTRACHAN , Lingli ZHANG , John L. MELANSON , James KELTON
IPC: H03M1/06
Abstract: A digital-to-analog converter may include an integrator, an input network comprising a plurality of parallel taps, each member of the plurality of parallel taps comprising a respective input resistance, and control circuitry configured to selectively enable and selectively disable particular members of the plurality of parallel taps in order to program an effective input resistance of the input network to control an analog gain of the digital-to-analog converter.
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公开(公告)号：US20240421783A1
公开(公告)日：2024-12-19
申请号：US18820727
申请日：2024-08-30
Inventor： Lingli ZHANG , Theodore M. BURK , Yongjie CHENG , Paul M. ASTRACHAN
Abstract: This application relates to methods and apparatus for driving a transducer. A transducer driver has a switch network is operable to selectively connect a driver output to any of a first set of at least three different switching voltages. which are, in use, maintained throughout a switching cycle of the driver apparatus. The switch network is also operable to selectively connect the driver output to flying capacitor driver. A controller is configured to control the switch network and flying capacitor driver to generate a drive signal at the driver output based on an input signal, wherein in one mode of operation the driver output is switched between two of the first set of switching voltages with a controlled duty cycle and in another mode of operation the driver output is connected to the flying capacitor driver which is switched between first and second states with a controlled duty cycle.
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公开(公告)号：US20240291501A1
公开(公告)日：2024-08-29
申请号：US18654911
申请日：2024-05-03
Inventor： John L. MELANSON , Lingli ZHANG , Paul M. ASTRACHAN , James KELTON
Abstract: A digital-to-analog converter (DAC) may include an integrator, an input network, and control circuitry. The input network may include a plurality of parallel taps, each having a signal delay such that at least two of the signal delays of the members of the plurality of parallel taps are different, and wherein each member is coupled between an input of the digital-to-analog converter and an input of the integrator. The control circuitry may be configured to selectively enable and disable particular members of the plurality of parallel taps in order to program an effective input resistance of the input network to control an analog gain of the DAC, such that the control circuitry enables, substantially contemporaneously, an even number of members at a time in order to increase the analog gain, with half of such enabled members in a first group and half of such enabled members in a second group.
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