公开(公告)号：US11005572B1

公开(公告)日：2021-05-11

申请号：US17093399

申请日：2020-11-09

Applicant: XILINX, INC.

Inventor： Ping Chuan Chiang ,  Mayank Raj ,  Chuan Xie ,  Stanley Y. Chen ,  Sandeep Kumar ,  Sukruth Pattanagiri ,  Parag Upadhyaya ,  Yohan Frans

IPC: H04B10/69 ,  H03L1/02 ,  H03L7/189

Abstract: Examples described herein generally relate to a temperature-locked loop for optical elements. In an example, a device includes a controller and a digital-to-analog converter (DAC). The controller includes a DC-controllable transimpedance stage (DCTS), a slicer circuit, and a processor. The DCTS is configured to be coupled to a photodiode. An input node of the slicer circuit is coupled to an output node of the DCTS. The processor has an input node coupled to an output node of the slicer circuit. The DAC has an input node coupled to an output node of the processor and is configured to be coupled to a heater. The processor is configured to control (i) the DCTS to reduce a DC component of a signal on the output node of the DCTS and (ii) an output voltage on the output node of the DAC, both based on a signal output by the slicer circuit.

公开(公告)号：US11005478B2

公开(公告)日：2021-05-11

申请号：US16257350

申请日：2019-01-25

Applicant: Seiko Epson Corporation

Inventor： Hideo Haneda ,  Yasuhiro Sudo

IPC: H03L1/04 ,  H03L1/02 ,  H03B5/32 ,  G06N3/04 ,  G06N3/08 ,  H03B5/04 ,  H03H7/00 ,  H03M1/12

Abstract: An integrated circuit device includes first and second temperature sensors, an A/D conversion circuit that performs A/D conversion on first and second temperature detection voltages from the first and second temperature sensors and outputs first and second temperature detection data, a connection terminal that is electrically connected to a temperature detection target device of the first and second temperature sensors, and a digital signal processing circuit that performs digital calculation based on the first and second temperature detection data and performs a temperature compensation process of correcting temperature characteristics of the temperature detection target device.

公开(公告)号：US10985762B2

公开(公告)日：2021-04-20

申请号：US16240357

申请日：2019-01-04

Applicant: Microchip Technology Incorporated

Inventor： Arnel Tagatac

IPC: H03L1/02 ,  H03B5/30 ,  H03B5/04

Abstract: Systems, methods, and devices of the present disclosure relate, generally, to compensating for frequency error of a reference signal supplied to a clock-tracking-loop due to temperature. Error characteristics of a crystal oscillator that supplies the reference signal are used to compensate for possible frequency errors. Other systems, methods and devices are disclosed.

公开(公告)号：US20210067093A1

公开(公告)日：2021-03-04

申请号：US17003091

申请日：2020-08-26

Applicant: SEIKO EPSON CORPORATION

Inventor： Yusuke Matsuzawa

IPC: H03B5/04 ,  H03B5/32 ,  H03L1/02 ,  H03L1/04

Abstract: A vibration device includes: a first substrate including a first surface and a second surface located at an opposite side of the first surface, and a first integrated circuit disposed on at least one of the first surface and the second surface; a second substrate including a third surface bonded to the second surface, a fourth surface located at an opposite side of the third surface, a recess that opens to the third surface, and a second integrated circuit disposed on the fourth surface; and a vibration element accommodated in a space defined by an opening of the recess being closed by the first substrate.

公开(公告)号：US10931284B2

公开(公告)日：2021-02-23

申请号：US16405257

申请日：2019-05-07

Applicant: FOX ENTERPRISES, INC.

Inventor： James Bryan Northcutt ,  Eugene S. Trefethen

IPC: H03B5/34 ,  H03L1/02 ,  H01L41/047 ,  H03H9/19 ,  H03L1/04

Abstract: A family of resonators and other devices which employ virtual electrodes using pixel based projection across a gap onto a material. In many embodiments, the pixels are projected onto a piezoelectric material, such as quartz crystal, by an integrated circuit die placed opposite a face of the crystal. The die projects individual pixels of electromagnetic energy onto the crystal, which vibrates and produces its own electromagnetic energy which is received by the pixels. Pixel projection onto other materials, including non-resonant materials, is also disclosed. The pixel based projected electrodes may be used in combination with, or in lieu of, conventional metal electrodes. Individual pixels may be turned on and off, and gain- and phase-controlled, in order to achieve specific desired resonator response characteristics. Many types of devices using pixel based electrode projection are disclosed—including resonators having one or more electrodes, oscillators, filters, delay lines, antennas and others.

公开(公告)号：US10903790B1

公开(公告)日：2021-01-26

申请号：US16886030

申请日：2020-05-28

Applicant: NXP B.V.

Inventor： Yanyu Jin ,  Jos Verlinden ,  Maoqiang Liu

IPC: H03B5/12 ,  H03L1/02 ,  H03B1/02 ,  H03L7/099

Abstract: An LC oscillator has a tank driver connected to cause a matched-resistance LC tank to oscillate. The LC tank has an inductor leg in parallel with a capacitor leg. The inductor leg has an explicit inductor having an implicit resistance level RL. The capacitor leg has an explicit capacitor having an implicit resistance level RC connected in series with an explicit resistor having an explicit resistance level RR, where RM=(RC+RR) is substantially equal to RL. The LC oscillator may have a non-trimmable LC tank and be part of a temperature-compensated frequency reference generator having standalone frequency adjustment circuitry that offers better than ±0.1% frequency accuracy (after single trim and batch calibration) over process, voltage, and temperature variations, and lifetime, which can serve as a low-cost replacement for a crystal oscillator for many applications.

公开(公告)号：US20210018873A1

公开(公告)日：2021-01-21

申请号：US16931497

申请日：2020-07-17

Applicant: Seiko Epson Corporation

Inventor： Yutaka YAMAZAKI

IPC: G04B1/10 ,  H03B5/32 ,  H03L1/02 ,  G04C3/00 ,  G04B17/22

Abstract: A watch includes a chargeable power supply, a crystal oscillation circuit including a crystal oscillator and an oscillation circuit and configured to stop oscillating when a power supply voltage falls below an oscillation stop voltage and to start oscillating when the power supply voltage exceeds an oscillation start voltage, which is higher than the oscillation stop voltage, and a divider circuit that outputs a reference signal by dividing an oscillation signal output from the oscillation circuit. The watch also includes a temperature compensation circuit that performs a temperature compensation function operation that compensates for variation of the reference signal due to a temperature, a first voltage detection circuit that detects that the power supply voltage exceeded a first voltage that is set higher than the oscillation start voltage, and a control circuit that starts the temperature compensation function operation of the temperature compensation circuit when the first voltage detection circuit detects that the power supply voltage exceeded the first voltage, and subsequently continues the temperature compensation function operation even when the power supply voltage falls below the first voltage.

公开(公告)号：US10855289B2

公开(公告)日：2020-12-01

申请号：US16676785

申请日：2019-11-07

Applicant: TXC CORPORATION

Inventor： Wan-Lin Hsieh ,  Erh-Shuo Hsu ,  Shao-Po Sun ,  Sheng-Hsiang Kao ,  Yu-Shun Yen

IPC: H03L1/02 ,  H03L1/04 ,  G01K13/00 ,  H01L23/34 ,  H05K1/18 ,  H05K1/02 ,  H05K1/03

Abstract: An oven controlled crystal oscillator consisting includes a substrate, which includes a substrate, at least one base, a crystal blank, a first cover lid, an IC chip, a heat-insulating adhesive, a heater, and a second cover lid. The top of the base is provided with a cavity, and the top of the base is connected to the substrate through conductive wires without using solder. The crystal blank is mounted in the cavity. The first cover lid seals the cavity. The IC chip is mounted on the bottom of the base. The base is mounted on the substrate through the IC chip and the heat-insulating adhesive, and the IC chip is mounted to the bottom of the base. Alternatively, the IC chip and the base are horizontally arranged. The second cover lid is mounted on the top of the substrate.

公开(公告)号：US20200343856A1

公开(公告)日：2020-10-29

申请号：US16575410

申请日：2019-09-19

Applicant: GOODIX TECHNOLOGY INC.

Inventor： Mohamed ABOUDINA ,  Ahmed EMIRA ,  Amr Abuellil

IPC: H03B5/04 ,  H03L7/099 ,  H03L1/02

Abstract: Techniques are described for post-compensation of frequency drift due to changes in crystal oscillator temperature during operation. For example, a clock system is coupled with a crystal oscillator, and can use a reference clock signal from the crystal oscillator to generate an output clock signal using a clock generator. The clock system can monitor an electrical characteristic of a thermal component integrated with the oscillator, which it can map deterministically to a thermal value indicating a temperature of a crystal component of the oscillator. The clock system can then map the temperature deterministically to a frequency shift of the oscillator away from a nominal value. The clock system can then generate a post-compensation signal that directs the clock generator to shift the frequency of the clock output signal so as to compensate for at least a portion of the frequency drift.

公开(公告)号：US20200328750A1

公开(公告)日：2020-10-15

申请号：US16384374

申请日：2019-04-15

Applicant: Infineon Technologies AG

Inventor： Francesco Brandonisio

IPC: H03L7/099 ,  H03L7/093 ,  H03L1/00 ,  H03L1/02 ,  G05B13/04

Abstract: A tracking system for a digital Phase Locked Loop (PLL), the tracking system including a PLL model configured to emulate an actual internal PLL signal, wherein the emulation is based on another internal PLL signal received from the digital PLL and on an estimated analog PLL parameter of the PLL model; and a tracker configured to compare the emulated internal PLL signal with the actual internal PLL signal, and to update the estimated analog PLL parameter according to a minimization algorithm that minimizes a result of the comparison.