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公开(公告)号:US20180074126A1
公开(公告)日:2018-03-15
申请号:US15263059
申请日:2016-09-12
Applicant: QUALCOMM Incorporated
Inventor: Bilal Zafar , Rakesh Vattikonda , De Lu , Venkatasubramanian Narayanan , Masoud Zamani , Joseph Fang
IPC: G01R31/317 , G11C7/22 , G01R31/3177
CPC classification number: G01R31/31727 , G01R31/31704 , G01R31/3177 , G01R31/318552 , G11C7/22
Abstract: An apparatus and method of employing mutually exclusive write and read clocks in scan capture mode for testing digital interfaces. The apparatus includes a first circuit and a first clock generator configured to generate a first clock signal for transferring a test sample from an input to an output of the first circuit in response to the first clock signal during each of a first set of scan capture cycles; a second circuit and a second clock generator configured to generate a second clock signal for transferring the test sample from an input to an output of the second circuit in response to the second clock signal during each of a second set of scan capture cycle; the first clock signal being suppressed during each scan capture cycle of the second set, and the second clock signal being suppressed during each scan capture cycle of the first set.
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公开(公告)号:US20180006650A1
公开(公告)日:2018-01-04
申请号:US15367706
申请日:2016-12-02
Applicant: QUALCOMM Incorporated
Inventor: Venkat Narayanan , Rakesh Vattikonda , De Lu , Ramaprasath Vilangudipitchai , Samrat Sinharoy , Rui Chen
IPC: H03K19/0185 , H03K19/00 , H03K3/356
CPC classification number: H03K19/018521 , H03K3/012 , H03K3/356113 , H03K3/35613 , H03K3/356182 , H03K19/0013
Abstract: In one embodiment, a voltage level shifter includes a first NOR gate having a first input configured to receive a first input signal in a first power domain, a second input configured to receive an enable signal in a second power domain, a third input, and an output. The voltage level shifter also includes a second NOR gate having a first input configured to receive a second input signal in the first power domain, a second input configured to receive the enable signal in the second power domain, a third input coupled to the output of the first NOR gate, and an output coupled to the third input of the first NOR gate. The first and second NOR gates are powered by a supply voltage of the second power domain.
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公开(公告)号:US11810636B2
公开(公告)日:2023-11-07
申请号:US17574431
申请日:2022-01-12
Applicant: QUALCOMM Incorporated
Inventor: Rui Li , De Lu , Venkat Narayanan
IPC: G11C7/10
CPC classification number: G11C7/1009 , G11C7/1087
Abstract: An aspect of the disclosure relates to a latch array, including: a first set of master latches including a first set of clock inputs configured to receive a master clock, a first set of data inputs configured to receive a first set of data, and a first set of data outputs coupled to a set of bitlines, respectively; a second set of master latches including a second set of clock inputs configured to receive the master clock, a first set of write-bit inputs configured to receive a set of write-bit signals, and a set of write-bit outputs coupled to a set of write-bit lines, respectively; and an array of slave latches, wherein the slave latches in columns of the array include a second set of data inputs coupled to the set of bitlines, and a second set of write-bit inputs coupled to the set of write-bit lines, respectively.
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公开(公告)号:US11695393B2
公开(公告)日:2023-07-04
申请号:US17162647
申请日:2021-01-29
Applicant: QUALCOMM Incorporated
Inventor: Rui Li , De Lu , Venkat Narayanan
Abstract: A latch array including a row of master latches coupled to columns of slave latches. Each master latch includes an OR-AND-Inverter (OAI) gate cross-coupled with a NAND gate to receive and latch an input data, and each slave latch includes an AND-OR-Inverter (AOI) gate cross-coupled with a NOR gate to receive and latch the data from the master latch, and an inverter including an input coupled to the AOI gate and an output to produce an output data based on the input data. Alternatively, each master latch includes an AND-OR-Inverter (AOI) gate cross-coupled with a NOR gate to receive and latch an input data, and each slave latch includes an OR-AND-Inverter (OAI) gate cross-coupled with a NAND gate to receive and latch the data from the master latch, and an inverter including an input coupled to the OAI gate and an output to produce an output data.
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公开(公告)号:US09948303B2
公开(公告)日:2018-04-17
申请号:US15367751
申请日:2016-12-02
Applicant: QUALCOMM Incorporated
Inventor: Venkat Narayanan , Rakesh Vattikonda , De Lu , Ramaprasath Vilangudipitchai , Samrat Sinharoy , Rui Chen
IPC: H03L5/00 , H03K19/0185 , H03K19/00
CPC classification number: H03K19/018521 , H03K3/356121 , H03K3/356191 , H03K19/0013 , H03K19/01855 , H03K19/0963
Abstract: In one embodiment, a voltage level shifter includes a first p-type metal-oxide-semiconductor (PMOS) transistor having a gate configured to receive an input signal in a first power domain, and a second PMOS transistor, wherein the first and second PMOS transistors are coupled in series between a supply voltage of a second power domain and a node. The voltage level shifter also includes an inverter having an input coupled to the node and an output coupled to a gate of the second PMOS transistor, and a first n-type metal-oxide-semiconductor (NMOS) transistor having a gate configured to receive the input signal in the first power domain, wherein the first NMOS transistor is coupled between the node and a ground.
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公开(公告)号:US09941866B2
公开(公告)日:2018-04-10
申请号:US15207800
申请日:2016-07-12
Applicant: QUALCOMM Incorporated
Inventor: Rakesh Vattikonda , Samrat Sinharoy , De Lu
IPC: H03K3/289 , H03K3/037 , G01R31/317 , G01R31/3185
CPC classification number: H03K3/0372 , G01R31/31704 , G01R31/31723 , G01R31/318541
Abstract: In an aspect of the disclosure, a method and an apparatus are provided. The apparatus is a register array including first and second flip-flop latch arrays. The first flip-flop latch array includes a first set of master latches, a first set of slave latches coupled to the first set of master latches, and a first address port. The second flip-flop latch array includes a second set of master latches, a second set of slave latches coupled to the second set of master latches, and a second address port. The register array includes an address counter, coupled to the first flip-flop latch array and the second flip-flop latch array. The address counter is shared by the first flip-flop latch array and the second flip-flop latch array and configured to address, in parallel in a test mode, the first flip-flop latch array through the first address port and the second flip-flop latch array through the second address port.
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公开(公告)号:US09859893B1
公开(公告)日:2018-01-02
申请号:US15367706
申请日:2016-12-02
Applicant: QUALCOMM Incorporated
Inventor: Venkat Narayanan , Rakesh Vattikonda , De Lu , Ramaprasath Vilangudipitchai , Samrat Sinharoy , Rui Chen
IPC: H03K3/35 , H03K19/00 , G09G3/20 , H03K19/0185 , H03K3/356
CPC classification number: H03K19/018521 , H03K3/012 , H03K3/356113 , H03K3/35613 , H03K3/356182 , H03K19/0013
Abstract: In one embodiment, a voltage level shifter includes a first NOR gate having a first input configured to receive a first input signal in a first power domain, a second input configured to receive an enable signal in a second power domain, a third input, and an output. The voltage level shifter also includes a second NOR gate having a first input configured to receive a second input signal in the first power domain, a second input configured to receive the enable signal in the second power domain, a third input coupled to the output of the first NOR gate, and an output coupled to the third input of the first NOR gate. The first and second NOR gates are powered by a supply voltage of the second power domain.
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公开(公告)号:US11823962B2
公开(公告)日:2023-11-21
申请号:US17180652
申请日:2021-02-19
Applicant: QUALCOMM Incorporated
Inventor: Saravanan Marimuthu , De Lu , Baldeo Sharan Sharma , Peeyush Kumar Parkar , Venkat Narayanan , Rui Li , Samy Shafik Tawfik Zaynoun , Min Chen , David Kidd , Amit Patil
IPC: H01L21/66 , G06F30/398
CPC classification number: H01L22/14 , G06F30/398 , H01L22/34
Abstract: Aspects of the disclosure are directed to sensing integrated circuit (IC) Back End Of Line (BEOL) process corners. In one aspect, an apparatus for sensing IC BEOL process corners includes a ring oscillator including a plurality of ring oscillator stages configured to generate an output waveform with a frequency state; and a shield net circuit including a plurality of shield net stages corresponding to the plurality of ring oscillator stages, the shield net circuit having a toggle input. And, a method includes generating an output waveform with a frequency state using a ring oscillator that includes a plurality of ring oscillator stages; modifying a plurality of ring oscillator stage time delays through a coupling between a plurality of shield net stages and the plurality of ring oscillator stages; and selecting the frequency state using a toggle input of a shield net circuit which includes the plurality of shield net stages.
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公开(公告)号:US11334321B2
公开(公告)日:2022-05-17
申请号:US16913631
申请日:2020-06-26
Applicant: QUALCOMM Incorporated
Inventor: Rui Li , De Lu , Venkat Narayanan , Srivatsan Chellappa
IPC: G06F7/58
Abstract: A true random number generator (TRNG) for generating a sequence of random numbers of bits is disclosed. The TRNG includes a TRNG cell configured to generate a sequence of bits logically alternating with a mean frequency and with substantially random period jitter; a period monitor configured to generate a first sequence of random bits based on a set of periods of the sequence of logically alternating bits; and a sampling circuit configured to sample the first sequence of random bits in response to a sampling clock to generate a second sequence of random bits.
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10.
公开(公告)号:US10164768B1
公开(公告)日:2018-12-25
申请号:US15904222
申请日:2018-02-23
Applicant: QUALCOMM Incorporated
Inventor: Ravindraraj Ramaraju , Rakesh Vattikonda , Samrat Sinharoy , De Lu , Bo Pang
Abstract: In certain aspects, a circuit includes a dynamic differential logic gate having first and second outputs, and a first static differential logic gate having first and second outputs, and first and second inputs coupled to the first and second outputs, respectively, of the dynamic differential logic gate. The dynamic differential logic gate is configured to receive a clock signal and to preset both the first and second outputs of the dynamic differential logic gate to a first preset value during a first phase of the clock signal. The first static differential logic gate is configured to preset both the first and second outputs of the first static differential logic gate to a second preset value when the first preset value is input to both the first and second inputs of the first static differential logic gate.
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