公开(公告)号：US20240022223A1

公开(公告)日：2024-01-18

申请号：US18476190

申请日：2023-09-27

Applicant: Apple Inc.

Inventor： Kefei Wu ,  Morteza Nick ,  David M. Signoff ,  Preeti S. Mulage

IPC: H03G3/30 ,  H03F3/72 ,  H04B1/00

CPC classification number: H03G3/3026 ,  H03F3/72 ,  H04B1/0053 ,  H03G2201/103 ,  H03F2200/24

Abstract: This disclosure is directed to reducing output voltage distortions of Variable Gain Amplifiers (VGAs). A VGA may include a number of amplifiers each providing a portion of a total gain of the VGA. For example, a processing circuit may select one or more of the amplifiers of the VGA to provide the output signal with a selected gain. However, the selected amplifiers may provide amplified signals with one or more distortion signals when receiving a bias voltage. Systems and methods are described to reduce or cancel the distortion signals of the selected amplifiers by providing a subthreshold nonzero bias voltage (e.g., a weak voltage) to the remaining (e.g., non-selected) amplifiers of the VGA. For example, the non-selected amplifiers may receive the weak voltage to provide distortion signals with similar voltage amplitude and out of phase compared to the distortion signals of the selected amplifiers.

公开(公告)号：US11870407B2

公开(公告)日：2024-01-09

申请号：US17968005

申请日：2022-10-18

Applicant: NeoPhotonics Corporation

Inventor： Mark J. Dayel ,  Wen-Jr Jiang ,  Jianying Zhou

IPC: H03G3/30 ,  G02F1/01 ,  H03F3/45 ,  G02F1/225 ,  G02F1/21

CPC classification number: H03G3/3084 ,  G02F1/0121 ,  G02F1/0123 ,  G02F1/0147 ,  G02F1/2255 ,  G02F1/2257 ,  H03F3/45475 ,  G02F1/212 ,  G02F2203/50 ,  H03G2201/103

Abstract: Improved dither detection, measurement, and voltage bias adjustments for an electro-optical modulator are described. The electro-optical modulator generally includes RF electrodes and phase heaters interfaced with semi-conductor waveguides on the arms of Mach-Zehnder interferometers, where a processor is connected to output a bias tuning voltage to the electro-optical modulator for controlling optical modulation. A variable gain amplifier (VGA) can be configured with AC coupling connected to receive a signal from a transimpediance amplifier (TIA) that is configured to amply a photodetector signal from an optical tap that is used to measure an optical signal with a dither signal. The analog to digital converter (ADC) can be connected to receive output from the VGA. The processor can be connected to receive the signal from the ADC and to output the bias tuning voltage based on evaluation of the signal from the tap.

公开(公告)号：US20230386781A1

公开(公告)日：2023-11-30

申请号：US18203430

申请日：2023-05-30

Applicant: Hitachi High-Tech Corporation

Inventor： Zhao JINYU ,  Ayumi DOI ,  Aoi YAMAUCHI ,  Shuichiro TAKAHASHI

IPC: H01J37/244 ,  H01J37/28 ,  H03G3/30 ,  G01N23/2251

CPC classification number: H01J37/244 ,  H01J37/28 ,  H03G3/3036 ,  G01N23/2251 ,  H01J2237/2448 ,  H01J2237/24495 ,  H03G2201/103

Abstract: To correct a difference in signal intensity due to a difference in hardware, for example, temporal deterioration of the hardware in the same device, or a difference in signal intensity between different devices. An adjustment method according to the disclosure specifies an amplification gain with which the same detection signal intensity as that of a comparison target is obtained by comparing correspondence relationships between the detection signal intensity and the amplification gain at different time points in the same charged particle beam device or among different charged particle beam devices.

公开(公告)号：US11824506B2

公开(公告)日：2023-11-21

申请号：US17496431

申请日：2021-10-07

Applicant: Analog Devices International Unlimited Company

Inventor： Anthony Eric Turvey ,  Michael E. Harrell ,  Murat Demirkan

IPC: H03G3/30 ,  H03M1/00 ,  H03F3/04

CPC classification number: H03G3/30 ,  H03F3/04 ,  H03M1/001 ,  H03G2201/103

Abstract: An amplifier circuit comprises a first gain circuit path configured to provide a first signal gain to an input signal, a second gain circuit path configured to provide a second signal gain to an input signal, an auxiliary gain circuit path configured to provide an auxiliary signal gain to an auxiliary input signal, wherein the auxiliary signal gain is equal to the first signal gain minus the second signal gain, a summing circuit configured to sum the second gain signal path and the auxiliary signal path, and logic circuitry configured to change an output of the circuit between the first gain circuit path and the sum of the second gain signal path and the auxiliary signal path, and set the auxiliary input signal equal to the input signal before the changing.

公开(公告)号：US20230361727A1

公开(公告)日：2023-11-09

申请号：US18308850

申请日：2023-04-28

Applicant: STMicroelectronics S.r.I.

Inventor： Gaetano Cosentino

IPC: H03G3/30 ,  H03F3/19

CPC classification number: H03F3/19 ,  H03G3/30 ,  H03F2200/451 ,  H03G2201/103

Abstract: A circuit includes an amplifier and a feedback network coupled between the input and the output of the amplifier. The feedback network includes a plurality of parallel coupled branches, each branch having a first selection switch coupled to the input, a second selection switch coupled to the output, and an impedance between the first and second selection switches. Each branch includes a plurality of signal feedback paths coupled in parallel, each having a tuning switch coupled between the first selection switch and the second selection switch of that branch. A control unit is coupled to the feedback network and configured to vary a gain of the amplifier by selectively placing the first and second selection switches of each branch in a conductive state or a non-conductive state and selectively activating respective tuning switches of any branch having first and second selection switches in the conductive state.

公开(公告)号：US11804812B2

公开(公告)日：2023-10-31

申请号：US17941798

申请日：2022-09-09

Applicant: Nordic Semiconductor ASA

Inventor： Jani Ståhlberg ,  Timo Sillanpää

IPC: H04B1/00 ,  H04B1/40 ,  H03G3/30 ,  H03F3/19 ,  H04B1/715

CPC classification number: H03G3/3036 ,  H03F3/19 ,  H04B1/0057 ,  H04B1/40 ,  H04B1/715 ,  H03F2200/451 ,  H03G2201/103 ,  H03G2201/307 ,  H04B2001/7152

Abstract: A method of operating a radio receiver device comprises receiving a plurality of signals with a plurality of corresponding frequencies; applying respective gains to each of the plurality of signals; and storing the gain applied to each signal and its corresponding frequency. The method comprises subsequently receiving a further signal with a further frequency; and applying a further gain to the further signal. The further gain is determined using at least one of the stored gains according to a difference between the further frequency and at least one of the plurality of corresponding frequencies.

公开(公告)号：US20230308066A1

公开(公告)日：2023-09-28

申请号：US18180595

申请日：2023-03-08

Applicant: STMicroelectronics S.r.l.

Inventor： Nicola Rogledi ,  Vanni Poletto ,  Antonio Davide Leone

IPC: H03G3/30 ,  H03F3/04

CPC classification number: H03G3/30 ,  H03F3/04 ,  H03G2201/103

Abstract: In accordance with an embodiment, a variable gain amplifier includes: a first differential transistor pair coupled to a signal input; a first current source configured to provide a first bias current to the first differential transistor pair; a pair of diodes coupled to an output of the first differential transistor pair; a second differential transistor pair having an input coupled to the pair of diodes; a second current source configured to provide a second bias current to the second differential transistor pair; and a current control circuit coupled to the first current source and the second current source.

公开(公告)号：US20230299732A1

公开(公告)日：2023-09-21

申请号：US18324585

申请日：2023-05-26

Applicant: Skyworks Solutions, Inc.

Inventor： Yu-Jui Lin ,  Wei Zhang ,  David Steven Ripley ,  Vignesh Sridharan

IPC: H03G3/30 ,  H03F3/24 ,  H03F1/02 ,  H04B1/40

CPC classification number: H03G3/3042 ,  H03F3/245 ,  H03F1/0233 ,  H04B1/40 ,  H03G2201/307 ,  H03F2200/105 ,  H03F2200/451 ,  H03G2201/103

Abstract: Envelope tracking power amplifiers with advanced gain shaping are provided. In certain implementations, a power amplifier system includes a power amplifier that amplifies a radio frequency (RF) signal and an envelope tracker that controls a voltage level of a supply voltage of the power amplifier based on an envelope of the RF signal. The power amplifier system further includes a gain shaping circuit that generates a gain shaping current that changes with the voltage level of the supply voltage from the envelope tracker. For example, the gain shaping circuit can include an analog look-up table (LUT) mapping a particular voltage level of the supply voltage to a particular current level of gain shaping current. Additionally, the gain shaping circuit biases the power amplifier based on the gain shaping current.

公开(公告)号：US11750231B2

公开(公告)日：2023-09-05

申请号：US17038223

申请日：2020-09-30

Applicant: Skyworks Solutions, Inc.

Inventor： Carlos J. Briseno-Vidrios ,  Gabor Marek

IPC: H04L27/08 ,  H04B1/10 ,  H04B1/12 ,  H04B1/16 ,  H03F3/45 ,  H03G3/30 ,  H03K19/0175

CPC classification number: H04B1/1027 ,  H03F3/45475 ,  H03G3/3089 ,  H03K19/017509 ,  H04B1/123 ,  H04B1/1615 ,  H03G2201/103

Abstract: A method for calibrating a receiver of an isolator product includes adjusting a peaking frequency of a receiver signal path of a first integrated circuit die of the isolator product and a gain of the receiver signal path based on a predetermined peaking frequency, a predetermined gain, a first level of a diagnostic signal during a first interval, and a second level of the diagnostic signal during a second interval. The first interval and the second interval are non-overlapping intervals. The method may include receiving a calibration signal on a differential pair of nodes of the receiver signal path of the first integrated circuit die. The method may include generating a diagnostic signal corresponding to an average amplitude of a received version of the calibration signal.

公开(公告)号：US20230246617A1

公开(公告)日：2023-08-03

申请号：US18298065

申请日：2023-04-10

Applicant: INVENSENSE, INC.

Inventor： Igor Mucha ,  Michael Perrott

IPC: H03G3/30 ,  H03F3/68 ,  H04R3/04 ,  H04R29/00

CPC classification number: H03G3/3005 ,  H03F3/68 ,  H04R3/04 ,  H04R29/004 ,  H03F2200/171 ,  H03G2201/103 ,  H03F2200/375 ,  H03F2200/165 ,  H03F2200/03

Abstract: Exemplary multipath digital microphones described herein can comprise exemplary embodiments of automatic gain control and multipath digital audio signal digital signal processing chains, which allow low power and die size to be achieved as described herein, while still providing a high DR digital microphone systems. Further non-limiting embodiments can facilitate switching between multipath digital audio signal digital signal processing chains while minimizing audible artifacts associated with either the change in the gain automatic gain control amplifiers switching between multipath digital audio signal digital signal processing chains.