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公开(公告)号：US10979033B2
公开(公告)日：2021-04-13
申请号：US16939226
申请日：2020-07-27
Applicant: NXP USA, Inc.
Inventor： Andre Luis Vilas Boas , Felipe Ricardo Clayton
Abstract: A current-controlled oscillator receives an input current. Ramp voltage generating circuitry generates first and second ramp voltages in response to the input current. Selecting circuitry selects one of the first and second ramp voltages depending on their relative values. Switching circuitry receives a selected ramp voltage, generates a signal based on the selected ramp voltage relative to a reference voltage, and outputs a clock signal. In one embodiment, a comparator receives the reference voltage, one of the first and second ramp voltages, and outputs a comparison signal. Logic circuitry controls the ramp voltage generating circuitry to output one of the ramp voltages during one half of a clock cycle and to output the other ramp voltage during another half cycle of the clock signal based on the comparison signal and logic states of the logic circuitry.
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公开(公告)号：US20210099162A1
公开(公告)日：2021-04-01
申请号：US17119865
申请日：2020-12-11
Applicant: STMicroelectronics (Rousset) SAS
Inventor： Alexandre Tramoni , Jimmy Fort
IPC: H03K4/50
Abstract: An embodiment provides a circuit of cyclic activation of an electronic function including a hysteresis comparator controlling the charge of a capacitive element powering the function.
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公开(公告)号：US10804946B2
公开(公告)日：2020-10-13
申请号：US16194676
申请日：2018-11-19
Applicant: The Regents of the University of California
Inventor： Po-Han Wang , Haowei Jiang , Drew Hall , Patrick Mercier
IPC: H04B1/16 , H03F3/19 , H03K4/50 , H03K3/0231 , H03K3/011
Abstract: A low-power wake-up receiver. The receiver includes a transformer/filter resonating at a pre-selected frequency to realize passive RF voltage gain. A pseudo-balun envelope detector is coupled to an output of the transformer filter. A comparator or other quantizer is coupled to an output of the active pseudo-balun envelope detector (ED) for comparing the ED output to a comparison threshold voltage. The pseudo-balun envelop detector can be an active detector. The pseudo-balun detector can also be a passive detector.
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公开(公告)号：US20200212800A1
公开(公告)日：2020-07-02
申请号：US16259194
申请日：2019-01-28
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Jiwei FAN , Mingyue ZHAO , Huy Le Nhat NGUYEN
Abstract: A system includes an input voltage supply and advanced current mode (ACM) converter device coupled to the input voltage supply. The ACM converter device (102) includes a pulse-skipping mode (PSM) transitions controller configured to switch between PSM and discontinuous conduction mode (DCM). The system also includes an output inductor coupled to a switch node of the ACM converter device. The system also includes an output capacitor with a first terminal coupled to the output inductor and a second terminal coupled to a ground node. The system also includes a voltage divider in parallel with the output capacitor, where the voltage divider is configured to provide a feedback voltage to the ACM converter device.
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公开(公告)号：US10666236B2
公开(公告)日：2020-05-26
申请号：US16469621
申请日：2017-11-30
Applicant: POSTECH ACADEMY-INDUSTRY FOUNDATION
Inventor： Jae Yoon Sim , Ja Hyun Koo
IPC: H03K3/0231 , H03K3/011 , H03K4/50 , H03K4/501 , H03K4/52
Abstract: The present invention relates to a technology capable of compensating for a frequency error in a quadrature relaxation oscillator. The quadrature relaxation oscillator generates a signal at a desired frequency by using a resistor and a capacitor which are less sensitive to a PVT (Process, Voltage, Temperature) variation, generates a signal at a desired frequency by compensating for an error from design, which is caused by a mismatch between circuits due to a characteristic of a semiconductor process, through a feedback lop, and removes noise.
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Patent Agency Ranking
公开(公告)号：US20190379367A1
公开(公告)日：2019-12-12
申请号：US16431320
申请日：2019-06-04
Inventor： Saraubh SINGH , Vamsikrishna PARUPALLI
IPC: H03K4/50
Abstract: A system may include a ramp generation circuit for generating a ramp waveform and comprising a first passive circuit element having an impedance pertinent to generation of the ramp waveform and a control circuit comprising a second passive circuit element which is impedance-correlated to the first passive circuit element. The control circuit may be configured to use the second passive circuit element to generate a control signal for controlling the ramp generation circuit, such that a correlation between the first passive circuit element and the second passive circuit element substantially cancels physical variations of the first passive circuit element and the second passive circuit element and use a control signal clock for generating the control signal that is related to a ramp generation clock for generating the ramp waveform such that a magnitude of the ramp waveform remains substantially independent of frequency of operation.
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公开(公告)号：US10348189B2
公开(公告)日：2019-07-09
申请号：US15428333
申请日：2017-02-09
Applicant: Rohm Co., Ltd.
Inventor： Seiji Takenaka
Abstract: An oscillation circuit includes: a periodic signal generator which generates a periodic signal whose frequency varies; and a clock generator which generates a clock signal having a frequency commensurate with the frequency of the periodic signal.
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公开(公告)号：US20180166056A1
公开(公告)日：2018-06-14
申请号：US15894072
申请日：2018-02-12
Applicant: Hangzhou Boon Electronics Co., LTD.
Inventor： Chaoyang Yu , Huijiang Xia
Abstract: The present application discloses a driving circuit for driving an electronic device, the driving circuit has a voltage regulating circuit, a waveform generating circuit and a driving stage circuit. An input of the voltage regulating circuit is coupled to a power source. An input of the waveform generating circuit is coupled to an output of the voltage regulating circuit, and an output of the waveform generating circuit provides a periodic wave signal. The driving stage circuit has a signal input coupled to the output of the waveform generating circuit, a power input coupled to the power source, and an output for driving the electronic device.
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公开(公告)号：US09848152B1
公开(公告)日：2017-12-19
申请号：US15277859
申请日：2016-09-27
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Yingkan Lin , Yu-Shen Yang , Liping Deng
CPC classification number: H04N5/378 , H03M1/0639 , H03M1/56 , H04N5/365
Abstract: Apparatuses and methods for reducing vertical fixed pattern noise in imaging systems are disclosed herein. An example apparatus may include an analog dithering circuit coupled to randomly add an offset voltage to a first reference voltage in response to a random binary signal during an analog to digital conversion operation, and a ramp generator circuit coupled to receive the first reference voltage, and provide a second reference voltage in response, wherein the randomly added offset voltage to the first reference is also present in the second reference voltage.
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公开(公告)号：US20170353176A1
公开(公告)日：2017-12-07
申请号：US15537330
申请日：2015-12-11
Applicant: Nordic Semiconductor ASA
Inventor： Ola Bruset , Tor Øyvind Vedal
IPC: H03K4/50
CPC classification number: H03K4/50 , H03K3/0231 , H03K5/2481
Abstract: A relaxation oscillator 2 comprises: a comparator 4 comprising: a differential pair of transistors 140, 142, 144. 40, 42, 44; a static current source 32; and a dynamic current source 32; and at least one energy storage component 8, 14; wherein the comparator 4 is arranged to provide an output signal which triggers the charging or discharging of the energy storage component 8, the dynamic current source 32 being enabled prior to the charging or discharging being triggered and disabled after a predetermined time.
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