公开(公告)号：US06731167B2

公开(公告)日：2004-05-04

申请号：US09961250

申请日：2001-09-25

Applicant: Masashi Suzuki ,  Hitoshi Akamine ,  Tetsuaki Adachi ,  Takahiro Sato ,  Masashi Maruyama ,  Susumu Takada

Inventor： Masashi Suzuki ,  Hitoshi Akamine ,  Tetsuaki Adachi ,  Takahiro Sato ,  Masashi Maruyama ,  Susumu Takada

IPC: H03G516

CPC classification number: H01L27/0629 ,  H01L2224/48091 ,  H01L2224/48227 ,  H01L2224/49111 ,  H01L2224/49175 ,  H03F1/301 ,  H03F3/193 ,  H03F2200/294 ,  H03F2200/372 ,  H03G3/3042 ,  H03G2201/103 ,  H03G2201/206 ,  H03G2201/307 ,  H03G2201/40 ,  H01L2924/00014

Abstract: The number of components of a high frequency power amplifier is reduced. A bias resistance ratio is adjusted in accordance with a change in the threshold voltage Vth of a transistor. A high frequency power amplifier has a plurality of amplifying systems. Each of these systems has an input terminal to which a signal to be amplified is supplied, an output terminal, a bias terminal, a plurality of amplifying stages which are sequentially cascaded between the input and output terminals, and a bias circuit connected to the bias terminal and each of the amplifying stages to apply a bias potential to the amplifying stage. The amplifying stage includes a control terminal for receiving an input signal and the bias potential supplied to the stage and a first terminal for transmitting an output signal of the stage.

Abstract translation: 高频功率放大器的组件数量减少。 根据晶体管的阈值电压Vth的变化来调整偏置电阻比。 高频功率放大器具有多个放大系统。 这些系统中的每一个都具有供给要被放大的信号的输入端子，输出端子，偏置端子，在输入和输出端子之间顺序级联的多个放大级，以及连接到偏置的偏置电路 端子和每个放大级以向放大级施加偏置电位。 放大级包括用于接收输入信号和提供给级的偏置电位的控制端子和用于发送级的输出信号的第一端子。

公开(公告)号：US06683496B2

公开(公告)日：2004-01-27

申请号：US09931737

申请日：2001-08-20

Applicant: Peter John Poggi ,  Tim Dittmer ,  George Cabrera

Inventor： Peter John Poggi ,  Tim Dittmer ,  George Cabrera

IPC: H03G516

CPC classification number: H03G3/3042 ,  H03F1/0222 ,  H03F1/0233 ,  H03F1/0244 ,  H03F1/0277 ,  H03F3/211 ,  H03G3/004 ,  H03G2201/103 ,  H03G2201/504 ,  H03G2201/508 ,  H03G2201/702

Abstract: The variable power supply to an amplifier in an electrical circuit is dynamically controlled through the use of a lookup table responsive to one or more operating conditions of the electrical circuit. The lookup table is indexed by one or more of the operating conditions and the amount of amplification to be applied to an input signal to the amplifier is determined. One embodiment of the invention comprises a television transmitter circuit including a power amplifier circuit capable of amplifying a variable frequency COFDM or 8VSB input signal where the amount of amplification applied to the input signal is dynamically controlled through the use of a lookup table as a function of the frequency of the input signal.

Abstract translation: 通过使用响应于电路的一个或多个操作条件的查找表来动态地控制电路中的放大器的可变电源。 查找表由一个或多个操作条件索引，并确定要施加到放大器的输入信号的放大量。 本发明的一个实施例包括一种电视发射机电路，其包括能够放大可变频率COFDM或8VSB输入信号的功率放大器电路，其中通过使用查找表作为函数来动态地控制施加到输入信号的放大量 输入信号的频率。

公开(公告)号：US12126312B1

公开(公告)日：2024-10-22

申请号：US18359564

申请日：2023-07-26

Applicant: II-VI Delaware, Inc.

Inventor： Dinup Sukumaran ,  Richard D. Davis

IPC: H03G3/30 ,  G01J1/44 ,  H03F3/45

CPC classification number: H03G3/30 ,  G01J1/44 ,  H03F3/45475 ,  G01J2001/446 ,  H03G2201/103

Abstract: An optical device for optical signals comprises: a photodiode configured to receive the optical signals; and a linear transimpedance amplifier (TIA) having an input stage, an output stage, and at least one variable gain amplifier (VGA) provided between the input stage and the output stage. The optical device also comprises: an automatic gain control loop configured to rectify an output of the at least one VGA and compare the rectified output with a threshold gain setting to generate an automatic gain control voltage; and a detection circuitry being configured to detect a rate of change in the automatic gain control voltage and being configured to determine a first state indicative of an absence of the optical signals at the photodiode. At least in response to the determined first state, the detection circuitry is configured to disable the output stage of the linear TIA.

公开(公告)号：US12107556B2

公开(公告)日：2024-10-01

申请号：US17448822

申请日：2021-09-24

Applicant: Cisco Technology, Inc.

Inventor： Sanjay Sunder ,  Alexander C. Kurylak ,  Kadaba Lakshmikumar

IPC: H03F3/45 ,  H03G3/30

CPC classification number: H03F3/45475 ,  H03G3/30 ,  H03G2201/103

Abstract: An integrated circuit includes a transimpedance amplifier and an injection circuit. The injection circuit generates a first electrical test signal and injects the first electrical test signal into the transimpedance amplifier. The first electrical test signal or an output of the transimpedance amplifier generated based on the first electrical test signal is used to determine whether the integrated circuit is faulty.

公开(公告)号：US12101069B2

公开(公告)日：2024-09-24

申请号：US17707735

申请日：2022-03-29

Applicant: Space Exploration Technologies Corp.

Inventor： Frederic Duez ,  Frederic Paillardet

IPC: H03G3/30 ,  H03F3/19 ,  H04B1/04

CPC classification number: H03G3/3036 ,  H03F3/19 ,  H04B1/04 ,  H03F2200/451 ,  H03G2201/103 ,  H03G2201/307

Abstract: Technologies are provided for variable gain amplifiers (VGAs). An example VGA includes a resistor ladder including resistor legs coupled to first and second resistors; first differential switches connected to the resistor ladder and second differential switches connected to output nodes, a transistor in each of the first differential switches being coupled to an first electrical line interconnecting the first resistors and a different transistor in each of the first differential switches being coupled to a second electrical line interconnecting the second resistors; third differential switches connected to the resistor ladder and fourth differential switches connected to the output nodes, a transistor in each of the third differential switches being coupled to the first electrical line and a different transistor in each of the fourth differential switches being coupled to the second electrical line; and a pair of transistors respectively connected to the first differential switches and the third differential switches.

公开(公告)号：US12088268B2

公开(公告)日：2024-09-10

申请号：US17362885

申请日：2021-06-29

Applicant: HUAWEI TECHNOLOGIES CO.,LTD.

Inventor： Yunchao Guan ,  Lei Lu

IPC: H03F3/217 ,  H03F3/193 ,  H03G3/30 ,  H04B1/04 ,  H04B1/16 ,  H04B1/40

CPC classification number: H03G3/3036 ,  H03F3/193 ,  H03F2200/451 ,  H03G2201/103 ,  H03G2201/307 ,  H04B1/04 ,  H04B1/16 ,  H04B1/40

Abstract: A variable-gain amplifier and a phased array system are provided. A variable-gain amplifier includes a cascode circuit comprising a first amplification transistor and a second amplification transistor array that are cascaded, the second amplification transistor array comprising a plurality of second amplification transistors connected in parallel and configured to output an adjustable current to an output matching network, the first amplification transistor is a common-source transistor, the plurality of second amplification transistors are common-gate transistors, or the cascode circuit is a common-emitter common-base circuit, the first amplification transistor is a common-emitter amplification circuit, and the second amplification transistor array is a common-base amplification circuit. The variable-gain amplifier further including a variable capacitor circuit coupled to the second amplification transistor array and coupled to the output matching network at first nodes.

公开(公告)号：US12088258B2

公开(公告)日：2024-09-10

申请号：US17439774

申请日：2019-11-04

Applicant: SUZHOU NOVOSENSE MICROELECTRONICS CO., LTD.

Inventor： Qihui Chen

IPC: H03F1/32 ,  H03F3/183 ,  H03G3/30 ,  H04R3/04

CPC classification number: H03F1/32 ,  H03F3/183 ,  H03G3/3005 ,  H04R3/04 ,  H03F2200/03 ,  H03G2201/103 ,  H04R2430/01

Abstract: Provided is a preamplifying circuit, including a first amplifier and a second amplifier sequentially connected in series, wherein an output end of the second amplifier is connected to a circuit output end, and an input end of the first amplifier is connected to a circuit input end. The preamplifying circuit further includes a positive feedback branch including a diode group and a third amplifier, wherein one end of the diode group is connected to the input end of the first amplifier. The positive feedback circuit can positively feed part of signals back to the other end of the diode group, so that voltage drops at two ends of the diode group can be reduced, and harmonic distortion caused by nonlinearity of the diode group is reduced. Thus, the sound quality detected by a microphone sensor is improved.

公开(公告)号：US20240275350A1

公开(公告)日：2024-08-15

申请号：US18433906

申请日：2024-02-06

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： Yoshiyuki SUGIMOTO ,  Keiji TANAKA ,  Hiroshi UEMURA

IPC: H03G3/30 ,  H03F3/45

CPC classification number: H03G3/30 ,  H03F3/45282 ,  H03G2201/103

Abstract: A variable gain amplifier circuit includes a main circuit including a differential current circuit, a current divider circuit connected to a high potential side of the differential current circuit, and a load circuit connected to a high potential side of the current divider circuit, the main circuit being configured to generate differential output voltage signals by the load circuit in accordance with either differential input voltage signals or first differential current signals; and a gain adjustment circuit configured to adjust a gain of the main circuit. The gain adjustment circuit includes a generation circuit configured to generate a first control voltage and a second control voltage in accordance with a setting signal, and a limit circuit configured to limit, by detecting an amplitude of the differential output voltage signals, the voltage difference to a limit value or greater so that the amplitude does not become lower than a setting voltage.

公开(公告)号：US20240275349A1

公开(公告)日：2024-08-15

申请号：US18169768

申请日：2023-02-15

Applicant: Litrinium, Inc.

Inventor： Kashif Ahmed ,  Jichun Zhang

IPC: H03G3/30 ,  H01S5/042

CPC classification number: H03G3/30 ,  H01S5/042 ,  H03G2201/103

Abstract: A laser driver chipset for providing a signal to a laser diode is described. The laser driver chipset has a variable gain amplifier (VGA) circuit and a laser driver circuit. The VGA circuit is configured to receive an input signal having a variable swing amplitude and modulate it to produce a fixed swing amplitude. The laser driver circuit is configured to receive a VGA output signal from the VGA circuit and generate a linear output response to the input signal such that it provides an output current to drive the laser diode. The VGA circuit can comprise a first loop for biasing the direct current level to a target direct current level and a second loop for modulating the variable swing amplitude of the input signal to produce a fixed swing amplitude.

公开(公告)号：US12057815B2

公开(公告)日：2024-08-06

申请号：US17872729

申请日：2022-07-25

Applicant: ELDORA PRODUCTIONS

Inventor： Guillaume Chauvet

IPC: H03F3/183 ,  H03G3/30 ,  H04R3/04

CPC classification number: H03F3/183 ,  H03G3/3005 ,  H04R3/04 ,  H03F2200/03 ,  H03G2201/103 ,  H04R2420/09 ,  H04R2430/01

Abstract: An audio preamplifier (1) for a microphone, including: a chassis (2) with at least one audio input (17) and at least one audio output, a control panel (3) including a gain selector (10) being arranged on one of the sides of the chassis (2), the chassis (2) further including a receiving compartment inside which a first connector is arranged; and a cartridge (6) comprising a preamplification circuit and a gain control circuit, the cartridge (6) further having a second connector complementary to the first connector, the cartridge (6) being configured for being inserted in a removable manner into the receiving compartment of the chassis (2) so as to connect the first and second connectors. An audio preamplification kit includes an audio preamplifier (1) and a plurality of additional cartridges.