公开(公告)号：US06674999B2

公开(公告)日：2004-01-06

申请号：US09811082

申请日：2001-03-16

Applicant: Balasubramanian Ramachandran

Inventor： Balasubramanian Ramachandran

IPC: H04Q720

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 “DVLS” 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：US20240322776A1

公开(公告)日：2024-09-26

申请号：US18614454

申请日：2024-03-22

Applicant: BDCM A2 LLC

Inventor： Ahmet Hakan COSKUN ,  Wei-Min KUO

IPC: H03G3/30 ,  H01Q3/38 ,  H03F3/19

CPC classification number: H03G3/3036 ,  H01Q3/38 ,  H03F3/19 ,  H03G2201/103 ,  H03G2201/307

Abstract: A variable gain amplifier is disclosed having parallel sets of transistors and control for bias voltages, wherein the average of bias voltage values is strategically controlled to reduce phase variance. For example, a variable gain amplifier may include a first set of transistors coupled to a first bias voltage, a second set of transistors coupled to a second bias voltage, where the second set of transistors is coupled in parallel with the first set of transistors, and a control module adapted to control the first and second bias voltages, the control module adapted to reduce the gain of the first set of transistors while increasing the gain of the second set of transistors.

公开(公告)号：US20240322772A1

公开(公告)日：2024-09-26

申请号：US18694227

申请日：2022-03-19

Applicant: SANECHIPS TECHNOLOGY CO.,LTD

Inventor： Yi LIU ,  Yong WANG

IPC: H03F3/45 ,  H03G3/30 ,  H04B1/04

CPC classification number: H03F3/45076 ,  H03G3/3036 ,  H03F2200/451 ,  H03G2201/103 ,  H03G2201/307 ,  H04B1/04 ,  H04B2001/045

Abstract: Provided are a low-phase-shift variable-gain amplifier and a method for processing a radio frequency signal. The low-phase-shift variable-gain amplifier comprises: a differential cascode amplification circuit, which comprises a common-source transistor and a common-gate transistor, wherein a gate stage of the common-source transistor is connected to a first bias voltage via a target resistor, and a gate stage of the common-gate transistor is connected to a second bias voltage; a current-steering structure, wherein one end of the current-steering structure is connected between the common-source transistor and the common-gate transistor, a third current signal outputted by the current-steering structure is used to adjust a gain of the differential cascode amplification circuit; and a phase compensation circuit, wherein one end of the phase compensation circuit is connected between the common-source transistor and the common-gate transistor.

公开(公告)号：US20240313732A1

公开(公告)日：2024-09-19

申请号：US18601676

申请日：2024-03-11

Applicant: Nordic Semiconductor ASA

Inventor： Marko PESSA ,  David ZAPATA

IPC: H03G3/30 ,  H03F3/21

CPC classification number: H03G3/3036 ,  H03F3/211 ,  H03F2200/451 ,  H03G2201/103 ,  H03G2201/307

Abstract: An amplifier circuit portion is proved. The amplifier circuit is arranged to amplify an input signal with a gain based on a gain control signal. The amplifier circuit portion comprises a plurality of amplifier cells having a common input for receiving the input signal and a common output for providing an amplified version of the input signal. At least one of the amplifier cells is operable in: a controllable gain mode in which the amplifier cell provides an amplification gain to the input signal based on the gain control signal; and a fixed gain mode in which the amplifier cell provides a fixed, non-zero amplification gain to the input signal.

公开(公告)号：US12087545B2

公开(公告)日：2024-09-10

申请号：US18171829

申请日：2023-02-21

Applicant: Analogic Corporation

Inventor： Ahmed A. Hussein

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

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

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：US20240283417A1

公开(公告)日：2024-08-22

申请号：US18318321

申请日：2023-05-16

Applicant: TRON FUTURE TECH INC.

Inventor： YU-JIU WANG ,  YUE MING WU ,  HAO-CHUNG CHOU ,  TA-SHUN CHU

IPC: H03F3/24 ,  H03G3/30

CPC classification number: H03F3/245 ,  H03G3/3042 ,  H03F2200/105 ,  H03F2200/451 ,  H03G2201/10 ,  H03G2201/307

Abstract: The present application discloses a radio frequency (RF) device. The radio frequency device includes a power amplifier, a power detector, and a digital signal processor (DSP). The power amplifier outputs a RF signal. The power detector receives the RF signal, and performs a plurality of calibration operations to generate a plurality of calibration voltages corresponding to a plurality of bias voltage, wherein the calibration operations are performed at the bias voltages respectively, and the calibration voltages are temperature-correlated due to that electrical characteristics of the power detector are temperature-correlated. The DSP controls the power detector to operate at the bias voltages, obtains an index voltage for indicating power of the RF signal by performing calculations upon the calibration voltages to reduce temperature dependency of the index voltage, and adjusts a gain of the power amplifier according to the index voltage.

公开(公告)号：US20240213928A1

公开(公告)日：2024-06-27

申请号：US18089448

申请日：2022-12-27

Applicant: MACOM Technology Solutions Holdings, Inc.

Inventor： Nguyen Nguyen ,  Duy Nguyen ,  Trong Phan ,  Thanh Pham ,  Wayne Kennan ,  Stefano D'Agostino

IPC: H03F1/42 ,  H03F3/68 ,  H03G3/30

CPC classification number: H03F1/42 ,  H03F3/68 ,  H03G3/3036 ,  H03F2200/36 ,  H03F2200/451 ,  H03G2201/307

Abstract: A distributed amplifier system comprising an impedance matching network configured to match an input impedance to an output impedance of the signal source, and a DC block configured to block DC components in the input signal. A variable gain amplifier adjusts the gain applied to the input signal based on a gain control signal to generate a gain adjusted signal. An emitter follower circuit receives and processes the gain adjusted signal to introduce gain peaking to create a modified signal. A distributed amplifier receives and amplifies the modified signal from the emitter follower circuit, to create an amplified signal. The distributed amplifier includes a termination network and one or more impedance matching elements configured for gain shaping the amplified signal. The gain peaking introduced by the emitter follower circuit is controlled by a variable current source. The distributed amplifier may be an open collector distributed amplifier.

公开(公告)号：US20240072750A1

公开(公告)日：2024-02-29

申请号：US18460103

申请日：2023-09-01

Applicant: SKYWORKS SOLUTIONS, INC.

Inventor： Xingyi HUA ,  Weiheng CHANG

IPC: H03G3/30 ,  H03F3/24 ,  H04B1/44

CPC classification number: H03G3/3042 ,  H03F3/245 ,  H04B1/44 ,  H03F2200/294 ,  H03F2200/451 ,  H03G2201/103 ,  H03G2201/307

Abstract: This disclosure relates to variable-gain amplifiers that include degeneration circuits configured to adapt to a gain mode that is currently being implemented. For example, a variable-gain amplifier can operate in a plurality of gain modes to amplify a signal with different levels of amplification. The variable-gain amplifier can include a gain circuit configured to amplify a signal and a degeneration circuit coupled to the gain circuit. The degeneration circuit can include an inductor and a switching-capacitive arm coupled in parallel to the inductor. The degeneration circuit can operate based on a current gain mode to change an inductance for the variable-gain amplifier.

公开(公告)号：US11799434B2

公开(公告)日：2023-10-24

申请号：US17601314

申请日：2020-03-04

Applicant: Ciena Corporation

Inventor： Tom Luk ,  Ron Hartman

IPC: H03G3/30 ,  H03F3/45 ,  H04B1/16

CPC classification number: H03G3/3036 ,  H03F3/45475 ,  H03G3/3089 ,  H04B1/16 ,  H03F2200/129 ,  H03F2200/331 ,  H03F2200/336 ,  H03F2200/451 ,  H03F2203/45116 ,  H03G2201/307

Abstract: An automatic gain control system for a receiver, including: an automatic gain control loop (40) adapted to be coupled to both a first transimpedance amplifier (12) coupled to a first analog-to-digital converter (14) forming a first tributary and a second transimpedance amplifier (12) coupled to a second analog-to-digital converter (14) forming a second tributary; and an offset gain control voltage to gain balance a transimpedance amplifier gain of the first tributary and a transimpedance amplifier gain of the second tributary. The automatic gain control loop can be analog. Also, the automatic gain control loop can be implemented in hardware or firmware.

公开(公告)号：US11777457B2

公开(公告)日：2023-10-03

申请号：US17559879

申请日：2021-12-22

Applicant: APPLE INC.

Inventor： Andreas Langer ,  Christoph Hepp

IPC: H03F1/30 ,  H03F3/19 ,  H03F3/24 ,  H03F1/02 ,  H03G3/30 ,  H04B1/04

CPC classification number: H03F3/19 ,  H03F1/0216 ,  H03F1/0222 ,  H03F3/245 ,  H03G3/3042 ,  H03F2200/105 ,  H03F2200/336 ,  H03F2200/36 ,  H03F2200/451 ,  H03G2201/302 ,  H03G2201/307 ,  H04B1/04

Abstract: A circuit for generating a radio frequency signal is provided. The circuit includes an amplifier configured to generate a radio frequency signal based on a baseband signal. Further, the circuit includes a power supply configured to generate a variable supply voltage based on a control signal indicating a desired supply voltage, and to supply the variable supply voltage to the amplifier. The circuit further includes an envelope tracking circuit configured to generate the control signal based on a bandwidth of the baseband signal, and to supply the control signal to the power supply.