公开(公告)号：US07081791B2

公开(公告)日：2006-07-25

申请号：US10820675

申请日：2004-04-07

Applicant: Lorenzo M. Carpineto ,  Eric Duvivier ,  Stefano Cipriani

Inventor： Lorenzo M. Carpineto ,  Eric Duvivier ,  Stefano Cipriani

IPC: H03G3/20

CPC classification number: H03F1/0272 ,  H03F3/45188 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2203/45048 ,  H03F2203/45396 ,  H03G3/3036 ,  H03G2201/103 ,  H03G2201/206 ,  H03G2201/307

Abstract: A low noise amplifier circuit (10) includes an attenuator (12) for receiving a calibration signal and generating an attenuated calibration signal. A low noise amplifier (14) amplifies the attenuated calibration signal in calibration mode or amplifies a functional signal in functional mode. In calibration mode, a envelope detector/comparator (16) compares the calibration signal with the output of the low noise amplifier and generates a compensation signal indicating a deviation between the two signals. The gain of the low noise amplifier is adjusted responsive to the compensation signal.

Abstract translation: 低噪声放大器电路（10）包括用于接收校准信号并产生衰减的校准信号的衰减器（12）。 低噪声放大器（14）在校准模式下放大衰减的校准信号，或者在功能模式下放大功能信号。 在校准模式中，包络检测器/比较器（16）将校准信号与低噪声放大器的输出进行比较，并产生指示两个信号之间的偏差的补偿信号。 响应补偿信号调整低噪声放大器的增益。

公开(公告)号：US20060066398A1

公开(公告)日：2006-03-30

申请号：US11227109

申请日：2005-09-16

Applicant: Hitoshi Akamine ,  Masahiro Tsuchiya ,  Kyoichi Takahashi ,  Kazuhiro Koshio

Inventor： Hitoshi Akamine ,  Masahiro Tsuchiya ,  Kyoichi Takahashi ,  Kazuhiro Koshio

IPC: H03G3/20

CPC classification number: H03F3/191 ,  H03F1/30 ,  H03F1/32 ,  H03G1/007 ,  H03G3/004 ,  H03G3/3047 ,  H03G2201/103 ,  H03G2201/206 ,  H03G2201/307 ,  H03G2201/40

Abstract: In a high frequency power amplifier circuit in which bias voltages are applied to the transistors for amplification by current mirroring, this invention enables preventing waveform distortion near the peak output power level by allowing sufficient idle currents to flow through the transistors for amplification, while enhancing the power efficiency in a low output power region. The power amplifier includes a detection circuit comprising a transistor for detection which receives the AC component of an input signal to the last-stage transistor for amplification at its control terminal, a current mirror circuit which mirrors current flowing through that transistor, and a current-voltage conversion means which converts current flowing in the slave side of the current mirror circuit into a voltage. In the detection circuit, a voltage from a bias circuit for generating the bias voltages for the transistors for amplification is applied to the control terminal of the transistor for detection and output of the detection circuit is applied to the control terminal of the last-stage transistor for amplification.

Abstract translation: 在通过电流镜像将偏置电压施加到晶体管以进行放大的高频功率放大器电路中，本发明能够通过允许足够的空闲电流流过晶体管进行放大，从而防止峰值输出功率电平附近的波形失真，同时增强 低输出功率区域的功率效率。 功率放大器包括检测电路，该检测电路包括用于检测的晶体管，其将用于在其控制端子处放大的最后级晶体管的输入信号的AC分量接收;反射电流流过该晶体管的电流镜电路， 电压转换装置，其将在电流镜电路的从侧中流动的电流转换成电压。 在检测电路中，用于产生用于放大的晶体管的偏置电压的偏置电路的电压被施加到用于检测的晶体管的控制端，并且检测电路的输出被施加到最后级晶体管的控制端 用于扩增。

公开(公告)号：US20050221779A1

公开(公告)日：2005-10-06

申请号：US11093416

申请日：2005-03-30

Applicant: Taiwa Okanobu

Inventor： Taiwa Okanobu

IPC: H03G3/20 ,  H03G1/00 ,  H03G3/30 ,  H03G7/00 ,  H04B1/06 ,  H04B1/10 ,  H04B1/16 ,  H04B7/00 ,  H04B17/40 ,  H04B17/02

CPC classification number: H03G3/3068 ,  H03G1/0023 ,  H03G1/0088 ,  H03G7/001 ,  H03G2201/103 ,  H03G2201/204 ,  H03G2201/305 ,  H03G2201/307 ,  H03G2201/506

Abstract: An automatic gain control (AGC) circuit includes a number of attenuation circuits connected in series relative to a reception signal, a of variable gain amplifiers to which the reception signal and each output signal from the attenuation circuits are fed, respectively, a signal deriving circuit connected to output terminals of the variable gain amplifiers for deriving a level-controlled output signal, and a control current generating circuit for generating a control current having a predetermined characteristic out of first and second AGC voltages, wherein the control current outputted from the control current generating circuit is supplied to the variable gain amplifiers as a control signal for switching an operation thereof and for controlling a gain thereof, and a feedback control current corresponding to the control current is performed by the control current generating circuit.

Abstract translation: 自动增益控制（AGC）电路包括相对于接收信号串联连接的多个衰减电路，分别馈送有来自衰减电路的接收信号和每个输出信号的可变增益放大器的信号导出电路 连接到可变增益放大器的输出端，用于导出电平控制的输出信号;以及控制电流产生电路，用于产生具有从第一和第二AGC电压起的预定特性的控制电流，其中从控制电流输出的控制电流 发电电路被提供给可变增益放大器作为用于切换其操作并用于控制其增益的控制信号，并且由控制电流产生电路执行与控制电流相对应的反馈控制电流。

公开(公告)号：US06847904B2

公开(公告)日：2005-01-25

申请号：US10374016

申请日：2003-02-25

Applicant: Kumen E. Blake ,  James B. Nolan

Inventor： Kumen E. Blake ,  James B. Nolan

IPC: G06F19/00 ,  H03F3/00 ,  H03G3/00 ,  H03G3/30

CPC classification number: H03G3/001 ,  H03G3/3026 ,  H03G2201/103 ,  H03G2201/502

Abstract: A programmable gain amplifier (PGA) controlled through a serial communications interface are fabricated on an integrated circuit (IC). A multiplexer (MUX) may also be included on the IC. The serial communications interface controls the gain of the PGA, MUX channel selection, and other functions of the PGA. Status of the PGA may also be obtained through the serial communications interface. By using a serial communications interface, the pin count of the PGA IC package may be kept to a minimum.

Abstract translation: 通过串行通信接口控制的可编程增益放大器（PGA）在集成电路（IC）上制造。 多路复用器（MUX）也可以包括在IC上。 串行通信接口控制PGA的增益，MUX通道选择和PGA的其他功能。 也可以通过串行通信接口获得PGA的状态。 通过使用串行通信接口，可以将PGA IC封装的引脚数保持在最小值。

公开(公告)号：US20020159503A1

公开(公告)日：2002-10-31

申请号：US09811082

申请日：2001-03-16

Applicant: Conexant Systems, Inc.

Inventor： Balasubramanian Ramachandran

IPC: H04B001/69

CPC classification number: H04W52/267 ,  H03G3/004 ,  H03G3/3042 ,  H03G2201/103 ,  H03G2201/307 ,  H03G2201/40 ,  H03G2201/508 ,  H04B1/109 ,  H04L1/0001 ,  H04W52/08 ,  H04W52/38

Abstract: A dynamically varying linearity system nullDVLSnull capable of varying the linearity of a radio frequency (RF) front-end of a communication device responsive to receiving a condition signal indicating a desired mode of operation of a transmitter. The DVLS may include a condition signal indicative of the desired mode of operation and a controller that adjusts the linearity of the transmitter responsive to the condition signal. The condition signal may be responsive to a user interface. The controller, responsive to the condition signal, may dynamically adjust the operating current of the transmitter.

Abstract translation: 一种动态变化的线性系统“DVLS”，其能够响应于接收到指示发射机的所需操作模式的条件信号而改变通信设备的射频（RF）前端的线性度。 DVLS可以包括指示期望的操作模式的条件信号和响应于条件信号来调整发射机的线性度的控制器。 条件信号可以响应于用户界面。 控制器响应于条件信号，可以动态地调整发射机的工作电流。

公开(公告)号：US20240312447A1

公开(公告)日：2024-09-19

申请号：US18676619

申请日：2024-05-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xiaowei YU ,  Jiasheng LI ,  Guopeng WU ,  Shan OUYANG ,  Yulong LI ,  Fan FAN

IPC: G10K11/178 ,  H03G3/30

CPC classification number: G10K11/17823 ,  G10K11/17817 ,  G10K11/17825 ,  G10K11/17881 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3056 ,  H03G3/3005 ,  H03G2201/103

Abstract: A headset with the active noise cancellation (ANC) function includes an ANC module, a plurality of speakers, a plurality of power drive circuits, and at least one reference microphone. An output end of any one of the plurality of power drive circuits is connected to at least one of the plurality speakers. The ANC module is connected between at least one reference microphone and input ends of the plurality of power drive circuits. The at least one reference microphone is configured to collect at least one first ambient noise signal. The ANC module is configured to obtain at least one mixed audio signal. The plurality of power drive circuits are configured to perform power amplification on the at least one mixed audio signal based on respective output powers to obtain at least one power-amplified mixed audio signal.

公开(公告)号：US12088266B2

公开(公告)日：2024-09-10

申请号：US18345671

申请日：2023-06-30

Applicant: Sonos, Inc.

Inventor： Aurelio Ramos

IPC: H03G11/00 ,  H03G3/30 ,  H03G7/00 ,  H03G9/02 ,  H04R3/00 ,  H04H40/54

CPC classification number: H03G11/00 ,  H03G3/3005 ,  H03G7/002 ,  H03G9/025 ,  H04R3/007 ,  H03G2201/103 ,  H04R2430/01

Abstract: Systems and methods for limiting volume in an audio playback device using a feedback controller are disclosed herein. In one example, a gain stage modulates gain of an audio signal based in part on feedback from a downstream limiter. The gain stage receives a first audio signal as well as a feedback signal from the feedback controller. Based at least in part on the feedback signal from the feedback controller, the gain stage modulates a gain of the first audio signal to provide a second audio signal. The second audio signal is delivered to the limiter, which limits the second audio signal to produce an output signal. The output signal is played back via a transducer. The feedback controller receives a gain reduction value from the limiter and determines a feedback signal to provide to the gain stage upstream of the limiter.

公开(公告)号：US20240297628A1

公开(公告)日：2024-09-05

申请号：US18592918

申请日：2024-03-01

Applicant: Skyworks Solutions, Inc.

Inventor： Neal J. Tuffy ,  Martin John O’Flaherty ,  Tomas J. Tansley ,  Valter Karavanic

IPC: H03G3/30 ,  H03F3/24 ,  H04W52/52 ,  H04W84/12

CPC classification number: H03G3/3042 ,  H03F3/245 ,  H04W52/52 ,  H03F2200/451 ,  H03G2201/103 ,  H03G2201/307 ,  H04W84/12

Abstract: A power amplifier includes a power amplifier stage configured to amplify a signal received from an attenuator or from a variable gain amplifier. An open loop transient gain compensation circuit compensates a transient turn-on gain variation of the power amplifier stage with a transient compensation current added to a bias current supplied to the attenuator or supplied to the variable gain amplifier.

公开(公告)号：US12073145B2

公开(公告)日：2024-08-27

申请号：US17522049

申请日：2021-11-09

Applicant: Metra Electronics Corporation

Inventor： Jason Anderson ,  William H. Jones, Jr.

IPC: H04R3/00 ,  G06F3/16 ,  H03F3/21 ,  H03G3/30

CPC classification number: G06F3/162 ,  H03F3/21 ,  H03G3/3005 ,  H04R3/00 ,  H03F2200/03 ,  H03G2201/103 ,  H04R2499/13

Abstract: A modular vehicle sound system that can be upgraded or reconfigured by changing a plug-in module. In the advanced-capability embodiments the invention combines the functions of a vehicle data bus interface, a digital signal processor, and an amplifier. In the advanced-capability embodiments the invention provides a wireless interface with a separate digital device that can be used to control the inventive amplifier.

公开(公告)号：US20240275351A1

公开(公告)日：2024-08-15

申请号：US18629835

申请日：2024-04-08

Applicant: Gigajot Technology, Inc.

Inventor： Dexue Zhang

IPC: H03G3/30 ,  H03F3/45

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

Abstract: Charge leakage/injection suppression circuitry within a capacitive programmable gain amplifier provides a low-impedance expulsion path for residual carriers within a feedback-path amplifier-mode switch and equalizes a voltage across a critical-leakage-path component of that amplifier-mode switch, reducing charge injection and leakage into an otherwise isolated amplifier input node to yield a low-noise amplifier output.