公开(公告)号：US10979033B2

公开(公告)日：2021-04-13

申请号：US16939226

申请日：2020-07-27

申请人： NXP USA, Inc.

发明人： Andre Luis Vilas Boas ,  Felipe Ricardo Clayton

IPC分类号： H03K3/012 ,  G06F1/06 ,  H03K4/50 ,  H03K3/037 ,  H03K3/0231 ,  H03K4/501 ,  H03K4/502

摘要： 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.

公开(公告)号：US20210099162A1

公开(公告)日：2021-04-01

申请号：US17119865

申请日：2020-12-11

申请人： STMicroelectronics (Rousset) SAS

发明人： Alexandre Tramoni ,  Jimmy Fort

IPC分类号： H03K4/50

摘要： 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.

公开(公告)号：US10804946B2

公开(公告)日：2020-10-13

申请号：US16194676

申请日：2018-11-19

申请人： The Regents of the University of California

发明人： Po-Han Wang ,  Haowei Jiang ,  Drew Hall ,  Patrick Mercier

IPC分类号： H04B1/16 ,  H03F3/19 ,  H03K4/50 ,  H03K3/0231 ,  H03K3/011

摘要： 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.

公开(公告)号：US20200212800A1

公开(公告)日：2020-07-02

申请号：US16259194

申请日：2019-01-28

申请人： TEXAS INSTRUMENTS INCORPORATED

发明人： Jiwei FAN ,  Mingyue ZHAO ,  Huy Le Nhat NGUYEN

IPC分类号： H02M3/158 ,  H02M1/08 ,  H02M1/14 ,  H03K7/08 ,  H03K4/50 ,  H03K19/20

摘要： 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.

公开(公告)号：US10666236B2

公开(公告)日：2020-05-26

申请号：US16469621

申请日：2017-11-30

申请人： POSTECH ACADEMY-INDUSTRY FOUNDATION

发明人： Jae Yoon Sim ,  Ja Hyun Koo

IPC分类号： H03K3/0231 ,  H03K3/011 ,  H03K4/50 ,  H03K4/501 ,  H03K4/52

摘要： 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.

公开(公告)号：US20190379367A1

公开(公告)日：2019-12-12

申请号：US16431320

申请日：2019-06-04

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Saraubh SINGH ,  Vamsikrishna PARUPALLI

IPC分类号： H03K4/50

摘要： 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.

公开(公告)号：US10348189B2

公开(公告)日：2019-07-09

申请号：US15428333

申请日：2017-02-09

申请人： Rohm Co., Ltd.

发明人： Seiji Takenaka

IPC分类号： H02M1/44 ,  H03K3/03 ,  H03K4/50 ,  H03B23/00

摘要： 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.

公开(公告)号：US20180166056A1

公开(公告)日：2018-06-14

申请号：US15894072

申请日：2018-02-12

申请人： Hangzhou Boon Electronics Co., LTD.

发明人： Chaoyang Yu ,  Huijiang Xia

IPC分类号： G10K9/12 ,  G05F3/16 ,  H03K4/50

CPC分类号： G10K9/12 ,  G05F3/16 ,  H03K4/50 ,  H03K5/24 ,  H04R3/00

摘要： 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.

公开(公告)号：US09848152B1

公开(公告)日：2017-12-19

申请号：US15277859

申请日：2016-09-27

申请人： OMNIVISION TECHNOLOGIES, INC.

发明人： Yingkan Lin ,  Yu-Shen Yang ,  Liping Deng

IPC分类号： H04N5/378 ,  H03K4/50 ,  H03M1/06 ,  H03K4/502

CPC分类号： H04N5/378 ,  H03M1/0639 ,  H03M1/56 ,  H04N5/365

摘要： 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.

公开(公告)号：US20170353176A1

公开(公告)日：2017-12-07

申请号：US15537330

申请日：2015-12-11

申请人： Nordic Semiconductor ASA

发明人： Ola Bruset ,  Tor Øyvind Vedal

IPC分类号： H03K4/50

CPC分类号： H03K4/50 ,  H03K3/0231 ,  H03K5/2481

摘要： 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.