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1. 发明授权

US09558845B2 Sampling network and clocking scheme for a switched-capacitor integrator 有权
标题翻译：开关电容积分器的采样网络和时钟方案
公开(公告)号：US09558845B2
公开(公告)日：2017-01-31
申请号：US14700696
申请日：2015-04-30
申请人： QUALCOMM Incorporated
发明人： Wenchang Huang , Ramkumar Sivakumar
IPC分类号： G06F7/64 , G06G7/18 , G06G7/19 , G11C27/02 , H03H19/00
CPC分类号： G11C27/026 , H03H19/004 , H03M3/342
摘要： Certain aspects of the present disclosure generally relate to a sampling network of a switched-capacitor integrator and a clocking scheme associated therewith, which may be used in an analog-to-digital converter (ADC), for example. The integrator generally includes five sets of switches which allow for a decreased switching frequency (e.g., halved) at an input stage of the integrator compared to conventional double sampling networks. As a result, the input impedance of the integrator may be increased (e.g., doubled), resulting in lower power consumption and reduced strain on driving circuitry.
摘要翻译：本公开的某些方面通常涉及开关电容积分器的采样网络和与其相关联的时钟方案，其可以例如在模数转换器（ADC）中使用。积分器通常包括五组开关，其允许与常规双采样网络相比在积分器的输入级降低开关频率（例如，减半）。结果，积分器的输入阻抗可以增加（例如，加倍），导致较低的功率消耗和减小的驱动电路的应变。

2. 发明授权

US11536749B2 Voltage-to-current architecture and error correction schemes 有权
公开(公告)号：US11536749B2
公开(公告)日：2022-12-27
申请号：US17154758
申请日：2021-01-21
申请人： QUALCOMM Incorporated
发明人： Ramkumar Sivakumar , Jingxue Lu , Sherif Galal , Xinwang Zhang , Kshitij Yadav
IPC分类号： H03F3/20 , H03F1/00 , H04R3/00 , G01R19/00 , H03F3/217 , H03F1/02
摘要： Certain aspects of the present disclosure are generally directed to circuitry and techniques for voltage-to-current conversion. For example, certain aspects provide a circuit for signal amplification including a first amplifier; a first transistor, a gate of the first transistor being coupled to an output of the first amplifier and a drain of the first transistor being coupled to an output node of circuit; a first resistive element coupled between a first input node of the circuit and an input of the first amplifier; a second amplifier; a second transistor, a gate of the second transistor being coupled to an output of the second amplifier and a drain of the second transistor being coupled to the output node of circuit; and a second resistive element coupled between a second input node of the circuit and an input of the second amplifier.

3. 发明申请

US20150002209A1 CIRCUITS FOR SEMICONDUCTOR DEVICE LEAKAGE CANCELLATION 审中-公开
标题翻译：用于半导体器件泄漏电路的电路
公开(公告)号：US20150002209A1
公开(公告)日：2015-01-01
申请号：US13930792
申请日：2013-06-28
申请人： QUALCOMM INCORPORATED
发明人： Ramkumar Sivakumar
IPC分类号： H03K17/687
CPC分类号： H03K17/687 , G11C7/12 , H03F3/45968 , H03F2203/45514 , H03F2203/45586 , H03F2203/45588
摘要： One feature pertains to a circuit comprising a semiconductor leakage source device and a semiconductor leakage cancellation device that are both coupled to a signal line. The leakage source device generates a leakage current on the signal line, and the leakage cancellation device generates a leakage cancellation current on the signal line. The leakage cancellation device is sized and shaped in relation to the leakage source device such that the leakage cancellation current effectively cancels the leakage current on the signal line. Moreover, the leakage cancellation current cancels the leakage current on the signal line despite variations in at least one of process, temperature, and/or signal line voltages. In one example, the signal line is a virtual ground node of a capacitive feedback amplifier and the leakage source device is a switch between the virtual ground node and a first terminal of a feedback capacitor of the amplifier.
摘要翻译：一个特征涉及包括耦合到信号线的半导体泄漏源装置和半导体泄漏消除装置的电路。泄漏源装置在信号线上产生泄漏电流，泄漏消除装置在信号线上产生泄漏消除电流。泄漏消除装置的尺寸和形状相对于泄漏源装置成形，使得泄漏抵消电流有效地消除信号线上的泄漏电流。此外，尽管在工艺，温度和/或信号线电压中的至少一个有变化，但是泄漏抵消电流消除了信号线上的漏电流。在一个示例中，信号线是电容性反馈放大器的虚拟接地节点，并且泄漏源装置是虚拟接地节点与放大器的反馈电容器的第一端子之间的开关。

4. 发明授权

US11424720B2 Audio power amplifier for reduced click and pop (CnP) 有权
公开(公告)号：US11424720B2
公开(公告)日：2022-08-23
申请号：US16827280
申请日：2020-03-23
申请人： QUALCOMM Incorporated
发明人： Pradeep Silva , Ramkumar Sivakumar , Qubo Zhou , Xinwang Zhang , Hanil Lee , Dongyang Tang , Vijayakumar Dhanasekaran
IPC分类号： H03F1/02 , H03F3/21 , H04B1/40
摘要： A power amplifier provides reduction of click and pop in audio applications. The power amplifier includes a first amplifier and an auxiliary amplifier. The auxiliary amplifier is used to ramp the power amplifier output from ground to an offset voltage to reduce the “click and pop” sound. The first amplifier and the auxiliary amplifier having a shared feedback loop. An output of the first amplifier and an output of the auxiliary amplifier may be switchably coupled to the shared feedback loop. A wave generator controls a switch to couple the first amplifier output or the auxiliary amplifier output to the shared feedback loop.

5. 发明申请

US20180374705A1 INTEGRATED TRANSIENT VOLTAGE SUPPRESSOR CIRCUIT 审中-公开
公开(公告)号：US20180374705A1
公开(公告)日：2018-12-27
申请号：US15632040
申请日：2017-06-23
申请人： QUALCOMM Incorporated
发明人： Vijayakumar Dhanasekaran , Ramkumar Sivakumar , Arash Mehrabi
IPC分类号： H01L21/265 , H01L27/08 , H01L29/93 , H01L29/861 , H01L27/02 , H01L29/87 , H01L29/06
摘要： A transient signal protection circuit includes an input node coupled to a signal line configured to carry an output signal from a first circuit to a second circuit, wherein the signal line is subject to experiencing an unwanted reverse signal from the second circuit to the first circuit. The transient signal protection circuit also includes a comparator module configured to output a clamping signal when it is determined that the unwanted reverse signal includes a value that falls outside an acceptable range of the first circuit; and a power switch coupled to the comparator module and configured to couple the input node to a sink node when the comparator module outputs the clamping signal.

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