公开(公告)号：US09753138B1

公开(公告)日：2017-09-05

申请号：US15097707

申请日：2016-04-13

Applicant: Microsoft Technology Licensing, LLC

Inventor： Dane Snow ,  Barry Thompson ,  Mustansir Mukadam ,  Stefan Wurster ,  Shaun McCarthy

IPC: H04N5/374 ,  G01S17/08 ,  G01K13/00 ,  G01J3/46 ,  H04N13/02 ,  H04N5/3745 ,  H04N5/378

CPC classification number: G01S17/08 ,  G01J3/46 ,  G01K7/01 ,  G01K13/00 ,  G11C27/026 ,  H04N5/37455 ,  H04N5/37457 ,  H04N5/378 ,  H04N13/207 ,  H04N13/246

Abstract: A transducer such as a translinear proportional-to-absolute-temperature sensor uses two amplifiers, where each amplifier is used in a variety of modes. The first amplifier generates a measurement voltage though feedback in an analog circuit. The second amplifier samples and integrates the measurement in a switched-capacitor mode, and the output is stored on a capacitor. Then the first amplifier is set to measure its offset. The offset is sampled and integrated by the second amplifier, and the output is stored on a second capacitor. Then the first and second amplifiers are set to buffer the voltages stored on the capacitors. The measurement can then be offset-adjusted by digital or analog means. The adjusted measurement is then available to be used for calibration of, e.g., an image sensor. Other transducers, such as pressure sensors, strain sensors, gyroscopes, magnetometers, accelerometers, and xyz positioning sensors may employ the same dual amplifier approach.

公开(公告)号：US10205931B2

公开(公告)日：2019-02-12

申请号：US15456786

申请日：2017-03-13

Applicant: Microsoft Technology Licensing, LLC

Inventor： Barry Thompson ,  Stefan Wurster ,  Lawrence A. Prather ,  Dane Snow ,  Richard McCauley

IPC: H04N13/254 ,  H01S5/065 ,  H01S5/042 ,  H01S5/068 ,  A63F13/213 ,  G06K9/00

Abstract: A voltage mode laser diode driver selectively turns on and off a laser diode. An output stage has an output node configured to be connected to one of the terminals of the laser diode. Depending upon implementation, an active swing controller drives the output stage in a manner that substantially prevents inductive kickback from causing the output node voltage to swinging above the voltage level at the voltage output of the power supply, or swing below ground. The output stage provides a discharge path around the laser diode to shunt current associated with the inductive kickback, and substantially eliminates ringing on the output node of the output stage while the laser diode is off. A power supply controller adjusts the voltage level of the voltage output of the power supply so that current through the laser diode when on and emitting light is substantially equal to a predetermined desired current.

公开(公告)号：US20170187164A1

公开(公告)日：2017-06-29

申请号：US15456786

申请日：2017-03-13

Applicant: Microsoft Technology Licensing, LLC

Inventor： Barry Thompson ,  Stefan Wurster ,  Lawrence A. Prather ,  Dane Snow ,  Richard McCauley

IPC: H01S5/042 ,  H04N13/02 ,  A63F13/213 ,  H01S5/068

CPC classification number: H04N13/254 ,  A63F13/213 ,  G06K9/00342 ,  H01S5/042 ,  H01S5/0427 ,  H01S5/0651 ,  H01S5/06808 ,  H01S5/06825

Abstract: A voltage mode laser diode driver selectively turns on and off a laser diode. An output stage has an output node configured to be connected to one of the terminals of the laser diode. Depending upon implementation, an active swing controller drives the output stage in a manner that substantially prevents inductive kickback from causing the output node voltage to swinging above the voltage level at the voltage output of the power supply, or swing below ground. The output stage provides a discharge path around the laser diode to shunt current associated with the inductive kickback, and substantially eliminates ringing on the output node of the output stage while the laser diode is off. A power supply controller adjusts the voltage level of the voltage output of the power supply so that current through the laser diode when on and emitting light is substantially equal to a predetermined desired current.