公开(公告)号：US20230197410A1

公开(公告)日：2023-06-22

申请号：US18171829

申请日：2023-02-21

Applicant: Analogic Corporation

Inventor： Ahmed A. Hussein

IPC: H01J37/32 ,  H03F3/24 ,  H03G3/30 ,  H03M1/66

CPC classification number: H01J37/32146 ,  H03F3/245 ,  H03G3/3042 ,  H03M1/66 ,  H03G2201/307 ,  H03F2200/451 ,  H03G2201/103

Abstract: One or more example relate, generally, to generating radio frequency (RF) signals. An apparatus may include a signal generator, an amplification stage, and a feedback control loop. The signal generator may generate a pulsed radio frequency (RF) signal at least partially responsive to a digital pulsed waveform defined by one or more commands. The amplification stage may amplify the pulsed RF signal. The feedback control loop may be coupled to the amplification stage to regulate a power level of respective steps of the pulsed RF signal.

公开(公告)号：US20230155560A1

公开(公告)日：2023-05-18

申请号：US17919784

申请日：2021-04-21

Applicant: ZTE CORPORATION

Inventor： Song CHEN ,  Jie LIN ,  Hao CHEN

IPC: H03G3/30

CPC classification number: H03G3/3036 ,  H03G2201/103 ,  H03G2201/307

Abstract: Provided are automatic level control (ALC) circuit, signal source, method for controlling signal source output power, and storage medium. The ALC circuit includes: at least two stages of ALC loops, each ALC loop including an amplifier, a coupler, a power detector, and an attenuation control module connected sequentially. An output end of an adjustable attenuator is connected to an input node of first stage of ALC loop; an output node of each stage of ALC loop, other than last stage of ALC loop, is connected to a normally on end of a two-way single-on switch, a first gating end of the two-way single-on switch is connected to an input node of a next stage of ALC loop, and the output node of the last stage of ALC loop and a second gating end of each two-way single-on switch are connected to an output end of the ALC circuit.

公开(公告)号：US20180331672A1

公开(公告)日：2018-11-15

申请号：US15978894

申请日：2018-05-14

Applicant: STMicroelectronics SA

Inventor： Renald Boulestin

IPC: H03H11/24 ,  H03F3/19 ,  H03G3/30 ,  H04B1/40

CPC classification number: H03H11/245 ,  H03F3/19 ,  H03F2200/451 ,  H03G1/0088 ,  H03G3/001 ,  H03G3/008 ,  H03G3/3036 ,  H03G2201/307 ,  H03H7/24 ,  H04B1/40

Abstract: An embodiment attenuator includes a plurality of circuits coupled in series. A respective circuit includes a first capacitor connected between an input node of the respective circuit and an output node of the respective circuit, and a second capacitor connected between the output node of the respective circuit and a reference node. The output node of the respective circuit, other than a last circuit of the plurality of circuits, is connected to the input node of a successive circuit. The attenuator further includes a plurality of selectors, in which the respective circuit is associated with a respective selector that is coupled between the output node of the respective circuit and an output node of the attenuator.

公开(公告)号：US10057681B2

公开(公告)日：2018-08-21

申请号：US15225088

申请日：2016-08-01

Applicant: BOSE CORPORATION

Inventor： Jeffery R. Vautin ,  Michael S. Dublin

IPC: H04R3/04 ,  H03G3/30 ,  H03G5/16 ,  H04S1/00

CPC classification number: H04R3/04 ,  H03G3/3005 ,  H03G3/3026 ,  H03G3/32 ,  H03G5/165 ,  H03G2201/307 ,  H04R2499/13 ,  H04S1/002 ,  H04S2400/13

Abstract: An entertainment audio processing system includes a music limiter configured to receive an audio signal, volume control information for music, and volume control information for announcement. The music limiter is further configured to calculate a gain parameter based on a music-to-announcement ratio. In another aspect, an entertainment audio processing system includes a mixer configured to substantially match a left audio signal channel and a right audio signal channel. The entertainment audio processing system further includes an equalizer configured to introduce magnitude and phase changes between the left audio signal channel and the right audio signal channel.

公开(公告)号：US08244193B2

公开(公告)日：2012-08-14

申请号：US12348450

申请日：2009-01-05

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H01Q11/12 ,  H04K3/00

CPC classification number: H04B1/0003 ,  H03F1/0261 ,  H03F3/45188 ,  H03G3/3042 ,  H03G2201/103 ,  H03G2201/202 ,  H03G2201/307 ,  H03G2201/40 ,  H04B1/0475

Abstract: A transmitter includes a dual mode modulator and an amplifier coupled to the dual mode modulator. The dual mode modulator implements a linear modulation scheme during a first mode of the modulator to produce a variable envelope modulated signal. The dual mode modulator implements a non-linear modulation scheme during a second mode of the modulator to produce a constant envelope modulated signal. The amplifier is biased as a linear amplifier during the first mode of the modulator and is biased as a non-linear amplifier during the second mode of the modulator. A feed-forward connection between the dual mode modulator and the amplifier is used to indicate a change in modulation mode and to adjust the bias of the amplifier. A power of the constant envelope modulated signal is increased such that an operating point of the amplifier remains substantially constant during the first and second modes of the modulator.

Abstract translation: 发射机包括耦合到双模调制器的双模调制器和放大器。 双模式调制器在调制器的第一模式期间实现线性调制方案，以产生可变包络调制信号。 双模式调制器在调制器的第二模式期间实现非线性调制方案，以产生恒定的包络调制信号。 放大器在调制器的第一模式期间被偏置为线性放大器，并且在调制器的第二模式期间被偏置为非线性放大器。 双模式调制器和放大器之间的前馈连接用于指示调制模式的变化并调整放大器的偏置。 恒定包络调制信号的功率增加，使得放大器的工作点在调制器的第一和第二模式期间保持基本恒定。

公开(公告)号：US08041322B2

公开(公告)日：2011-10-18

申请号：US12359358

申请日：2009-01-26

Applicant: Hiroji Akahori

Inventor： Hiroji Akahori

IPC: H04B1/06

CPC classification number: H03G3/3068 ,  H03G2201/204 ,  H03G2201/206 ,  H03G2201/305 ,  H03G2201/307

Abstract: A radio-frequency receiver includes an RF amplification circuit which amplifies a received RF signal and generates an amplified RF signal, a mixing circuit which converts the amplified RF signal into an intermediate-frequency signal, an IF amplification circuit which generates an amplified IF signal, a first level detection circuit which detects a level of the amplified RF signal, a second level detection circuit which detects a level of the IF signal, a third level detection circuit which detects a level of the amplified IF signal, a RF reference level generation circuit which generates an RF reference level based on one of respective detection signal levels of the first and second level detection circuits, and an RF gain control circuits which controls an amplification gain of the RF amplification circuit so that a detection signal level of the third level detection circuit becomes equal to the RF reference level.

Abstract translation: 射频接收机包括放大接收的RF信号并产生放大的RF信号的RF放大电路，将放大的RF信号转换为中频信号的混合电路，产生放大的IF信号的IF放大电路， 检测放大的RF信号的电平的第一电平检测电路，检测IF信号的电平的第二电平检测电路，检测放大的IF信号的电平的第三电平检测电路，RF基准电平生成电路 其基于第一和第二电平检测电路的相应检测信号电平之一产生RF参考电平，以及RF增益控制电路，其控制RF放大电路的放大增益，使得第三电平检测的检测信号电平 电路变得等于RF参考电平。

公开(公告)号：US07791412B2

公开(公告)日：2010-09-07

申请号：US12073686

申请日：2008-03-07

Applicant: Leonard Dauphinee ,  Lawrence M. Burns

Inventor： Leonard Dauphinee ,  Lawrence M. Burns

IPC: H03G3/20

CPC classification number: H01L22/20 ,  G01R31/2607 ,  G01R31/30 ,  G01R31/31723 ,  H01L2924/0002 ,  H03F3/211 ,  H03G3/3036 ,  H03G3/3052 ,  H03G2201/307 ,  H04N5/4446 ,  H04N5/52 ,  H04N7/102 ,  H01L2924/00

Abstract: A Variable Gain Amplifier (VGA) amplifies an input signal according to a gain, to produce an amplified signal. A detector module detects a power indicative of a power of the amplified signal. A comparator module compares the detected power to a high threshold, a low threshold and a target threshold intermediate the high and low thresholds. A controller module changes the gain of the VGA so as to drive the detected power in a direction toward the middle threshold when the comparator module indicates the detected power is not between the high and low thresholds.

Abstract translation: 可变增益放大器（VGA）根据增益放大输入信号，以产生放大信号。 检测器模块检测指示放大信号的功率的功率。 比较器模块将检测到的功率与高阈值和低阈值中间的高阈值，低阈值和目标阈值进行比较。 当比较器模块指示检测到的功率不在高阈值和低阈值之间时，控制器模块改变VGA的增益以驱动检测到的功率朝向中间阈值的方向。

公开(公告)号：US07629851B2

公开(公告)日：2009-12-08

申请号：US12234833

申请日：2008-09-22

Applicant: Hirokazu Tsurumaki ,  Hiroyuki Nagai ,  Tomio Furuya ,  Makoto Ishikawa

Inventor： Hirokazu Tsurumaki ,  Hiroyuki Nagai ,  Tomio Furuya ,  Makoto Ishikawa

IPC: H03G3/10

CPC classification number: H03G1/0005 ,  H03F1/301 ,  H03F2200/294 ,  H03F2200/372 ,  H03G2201/103 ,  H03G2201/206 ,  H03G2201/307 ,  H03G2201/40

Abstract: In a high frequency power amplifier circuit that supplies a bias to an amplifying FET by a current mirror method, scattering of a threshold voltage Vth due to the scattering of the channel impurity concentration of the FET, and a shift of a bias point caused by the scattering of the threshold voltage Vth and a channel length modulation coefficient λ due to a short channel effect are corrected automatically. The scattering of a high frequency power amplifying characteristic can be reduced as a result.

Abstract translation: 在通过电流镜法向放大FET提供偏置的高频功率放大器电路中，由于FET的沟道杂质浓度的散射引起的阈值电压Vth的散射和由 自动校正阈值电压Vth的散射和由于短通道效应引起的通道长度调制系数λ。 结果可以降低高频功率放大特性的散射。

公开(公告)号：US20090209219A1

公开(公告)日：2009-08-20

申请号：US12359358

申请日：2009-01-26

Applicant: Hiroji Akahori

Inventor： Hiroji Akahori

IPC: H04B1/06

CPC classification number: H03G3/3068 ,  H03G2201/204 ,  H03G2201/206 ,  H03G2201/305 ,  H03G2201/307

Abstract: A radio-frequency receiver includes an RF amplification circuit which amplifies a received RF signal and generates an amplified RF signal, a mixing circuit which converts the amplified RF signal into an intermediate-frequency signal, an IF amplification circuit which generates an amplified IF signal, a first level detection circuit which detects a level of the amplified RF signal, a second level detection circuit which detects a level of the IF signal, a third level detection circuit which detects a level of the amplified IF signal, a RF reference level generation circuit which generates an RF reference level based on one of respective detection signal levels of the first and second level detection circuits, and an RF gain control circuits which controls an amplification gain of the RF amplification circuit so that a detection signal level of the third level detection circuit becomes equal to the RF reference level.

Abstract translation: 射频接收机包括放大接收的RF信号并产生放大的RF信号的RF放大电路，将放大的RF信号转换为中频信号的混合电路，产生放大的IF信号的IF放大电路， 检测放大的RF信号的电平的第一电平检测电路，检测IF信号的电平的第二电平检测电路，检测放大的IF信号的电平的第三电平检测电路，RF基准电平生成电路 其基于第一和第二电平检测电路的相应检测信号电平之一产生RF参考电平，以及RF增益控制电路，其控制RF放大电路的放大增益，使得第三电平检测的检测信号电平 电路变得等于RF参考电平。

公开(公告)号：US20090154597A1

公开(公告)日：2009-06-18

申请号：US12348450

申请日：2009-01-05

Applicant: Meng-An PAN

Inventor： Meng-An PAN

IPC: H04L27/12 ,  H04L27/20 ,  H04B1/04

CPC classification number: H04B1/0003 ,  H03F1/0261 ,  H03F3/45188 ,  H03G3/3042 ,  H03G2201/103 ,  H03G2201/202 ,  H03G2201/307 ,  H03G2201/40 ,  H04B1/0475

Abstract: A transmitter includes a dual mode modulator and an amplifier coupled to the dual mode modulator. The dual mode modulator implements a linear modulation scheme during a first mode of the modulator to produce a variable envelope modulated signal. The dual mode modulator implements a non-linear modulation scheme during a second mode of the modulator to produce a constant envelope modulated signal. The amplifier is biased as a linear amplifier during the first mode of the modulator and is biased as a non-linear amplifier during the second mode of the modulator. A feed-forward connection between the dual mode modulator and the amplifier is used to indicate a change in modulation mode and to adjust the bias of the amplifier. A power of the constant envelope modulated signal is increased such that an operating point of the amplifier remains substantially constant during the first and second modes of the modulator.

Abstract translation: 发射机包括耦合到双模调制器的双模调制器和放大器。 双模式调制器在调制器的第一模式期间实现线性调制方案，以产生可变包络调制信号。 双模式调制器在调制器的第二模式期间实现非线性调制方案，以产生恒定的包络调制信号。 放大器在调制器的第一模式期间被偏置为线性放大器，并且在调制器的第二模式期间被偏置为非线性放大器。 双模式调制器和放大器之间的前馈连接用于指示调制模式的变化并调整放大器的偏置。 恒定包络调制信号的功率增加，使得放大器的工作点在调制器的第一和第二模式期间保持基本恒定。