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公开(公告)号：US11528053B2
公开(公告)日：2022-12-13
申请号：US17160965
申请日：2021-01-28
发明人： Feng Wei Kuo , Huan-Neng Chen , Lan-Chou Cho , Chewn-Pu Jou , William Wu Shen
IPC分类号： H04B3/04 , H03H7/01 , H03G5/28 , H04L27/22 , H03G3/30 , H03H11/04 , H04L27/38 , H04B17/21 , H04B1/00 , H04B1/10
摘要： A communication system includes a transmitter configured to transmit a modulated signal, a transmission line configured to carry the modulated signal, and a receiver coupled to the transmitter by the transmission line, and configured to receive the modulated signal. The transmitter includes a modulator configured to generate the modulated signal responsive to a data signal and a carrier signal. The receiver includes a demodulator configured to demodulate the modulated signal responsive to a first carrier signal. The demodulator includes a filter and a gain adjusting circuit configured to adjust a gain of the filter, and to generate the set of control signals based on a voltage of the filtered first signal and a voltage of the first signal. The gain adjusting circuit includes a first peak detector coupled to the filter, and configured to detect a peak value of the voltage of the filtered first signal.
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公开(公告)号：US11218804B2
公开(公告)日：2022-01-04
申请号：US16479718
申请日：2018-02-08
摘要： A system and method in an audio signal electrical circuit including a feedback loop with a digital filter coupled to a current digital to analog converter (IDAC) includes providing an output signal from the IDAC to analog elements of the audio signal electrical circuit, the output signal from the IDAC based upon a reference signal input to the IDAC when an output of the digital filter is not input to the IDAC. The system and method also include comparing an output signal of the audio signal electrical circuit to a reference, and calibrating the audio signal electrical circuit to correspond the output signal of the audio signal electrical circuit to the reference. Calibration of the audio signal electrical circuit enables more precise control of a cut-off frequency of a microphone signal when the output of the digital filter is input to the IDAC.
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公开(公告)号：US20210152212A1
公开(公告)日：2021-05-20
申请号：US17160965
申请日：2021-01-28
发明人： Feng Wei KUO , Huan-Neng CHEN , Lan-Chou CHO , Chewn-Pu JOU , William Wu SHEN
摘要： A communication system includes a transmitter configured to transmit a modulated signal, a transmission line configured to carry the modulated signal, and a receiver coupled to the transmitter by the transmission line, and configured to receive the modulated signal. The transmitter includes a modulator configured to generate the modulated signal responsive to a data signal and a carrier signal. The receiver includes a demodulator configured to demodulate the modulated signal responsive to a first carrier signal. The demodulator includes a filter and a gain adjusting circuit configured to adjust a gain of the filter, and to generate the set of control signals based on a voltage of the filtered first signal and a voltage of the first signal. The gain adjusting circuit includes a first peak detector coupled to the filter, and configured to detect a peak value of the voltage of the filtered first signal.
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公开(公告)号：US10313165B2
公开(公告)日：2019-06-04
申请号：US15453774
申请日：2017-03-08
摘要： High-data rate channel interface modules and equalization methods employing a finite impulse response (FIR) analog receive filter. Embodiments include an illustrative channel interface module having multiple amplifier-based delay units arranged in a sequential chain to convert an analog input signal into a set of increasingly-delayed analog signals that are weighted and combined together with the analog input signal to form an equalized signal; and a symbol decision element operating on the equalized signal to obtain a sequence of symbol decisions. An interface that extracts received data from the sequence of symbol decisions. The delay units may employ one or more delay cells each having a common-source amplifier stage followed by a source follower output stage, the two stages providing approximately equal portions of the propagation delay. An enhanced gate-to-drain capacitance in the common-source amplifier may increase propagation delay while reducing bandwidth limitations.
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公开(公告)号：US10175105B2
公开(公告)日：2019-01-08
申请号：US15212790
申请日：2016-07-18
发明人： Nico Presser , Martin Mueller
摘要： A laser scanning microscope for laser scanning a sample is provided. The laser scanning microscope includes a scanner that is operated at a predefined scanning speed and that is configured to change a direction of illumination light generated to illuminate the sample. A detector is configured to detect light that is returned from the sample and an amplifier assembly is connected to the detector and is configured to amplify a detection signal that is generated by the detector. The amplifier assembly includes an adjustable capacitor and a capacitance of the adjustable capacitor is adjusted depending on the scanning speed of the scanner.
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6.发明授权公开(公告)号：US09621117B2
公开(公告)日：2017-04-11
申请号：US15094658
申请日：2016-04-08
申请人： Maxlinear, Inc.
发明人： Raja Pullela , Wenjian Chen , Vamsi Paidi
CPC分类号： H04B1/16 , H03F1/565 , H03F3/195 , H03F2200/06 , H03F2200/165 , H03F2200/171 , H03F2200/294 , H03F2200/429 , H03F2200/451 , H03F2203/7209 , H03G5/28 , H03H7/0115 , H04B1/005
摘要： Methods and systems for a configurable low-noise amplifier with programmable band-selection filters may comprise a receiver with a low-noise amplifier (LNA) with differential output terminals; a low pass filter operably coupled to the LNA; a high pass filter operably coupled to the second input terminal of the LNA; and a signal source input coupled to the low pass filter and the high pass filter. The LNA may be operable to receive signals in a pass band of the high pass filter and a pass band of the low pass filter. The receiver may be operable to amplify input signals in the pass band of a first filter but not signals in the pass band of the second filter by operably coupling the second to ground.
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7.发明申请Musical instrument audio amplifier circuit and system for producing distortion effects 审中-公开乐器音频放大器电路和系统产生失真效应公开(公告)号：US20050201573A1
公开(公告)日：2005-09-15
申请号：US11068075
申请日：2005-02-28
申请人： Mark Poletti
发明人： Mark Poletti
CPC分类号： G10H1/12 , G10H3/26 , G10H2210/311 , G10H2250/055 , H03F1/327
摘要： A musical instrument amplifier circuit that can produce an output signal having a level of distortion that depends on the input signal. The amplifier circuit includes an amplifier arranged to receive the input signal and a filter following the amplifier that produces the output signal, wherein the output signal is fed back into the input signal so that the bandwidth of the amplifier circuit is modulated by the input signal. For example, the bandwidth of the amplifier circuit is wider at lower amplifier gains or input signal levels than at higher amplifier gains or input signal levels.
摘要翻译： 一种乐器放大器电路，其可以产生具有取决于输入信号的失真水平的输出信号。 所述放大器电路包括放大器，用于接收所述输入信号，并且所述放大器跟随产生所述输出信号的滤波器，其中所述输出信号被反馈到所述输入信号，以使得所述放大器电路的带宽被所述输入信号调制。 例如，放大器电路的带宽在较低的放大器增益或输入信号电平下比在较高的放大器增益或输入信号电平下更宽。
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公开(公告)号：US6058148A
公开(公告)日：2000-05-02
申请号：US883692
申请日：1997-06-27
申请人： J. William Whikehart , Christopher John Hagan , John William Wagner , Nicholas Lawrence Difiore , John Elliott Whitecar , James Alfred Wargnier
发明人： J. William Whikehart , Christopher John Hagan , John William Wagner , Nicholas Lawrence Difiore , John Elliott Whitecar , James Alfred Wargnier
CPC分类号： H03G5/28 , H04B1/1036 , H04B2001/1054
摘要： An adaptive intermediate frequency bandwidth control system detects IF signal levels both before and after channel filtering. The two levels are compared to provide a measure of the presence of interfering adjacent channels. This measure is compared to a programmable threshold and the IF bandwidth is narrowed if any interferers are detected. Digital FIR or IIR filtering is used. The invention allows bandwidth switching to be done very quickly with minimal transient effects. A difference threshold is selected depending upon the IF channel bandwidth being used at any given time.
摘要翻译： 自适应中频带宽控制系统在信道滤波前后检测中频信号电平。 比较两个级别以提供干扰相邻信道的存在的度量。 将此措施与可编程阈值进行比较，如果检测到任何干扰源，则IF带宽变窄。 使用数字FIR或IIR滤波。 本发明允许以最小的瞬态效应非常快地完成带宽切换。 根据在任何给定时间使用的IF信道带宽来选择差分阈值。
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9.发明授权Method and apparatus for high-order bandpass filter with linearly adjustable bandwidth 失效具有线性可调带宽的高阶带通滤波器的方法和装置
公开(公告)号：US6011770A
公开(公告)日：2000-01-04
申请号：US988158
申请日：1997-12-10
申请人： Mehmet Ali Tan
发明人： Mehmet Ali Tan
摘要： A method and apparatus for linearly adjusting the bandwidth of a high-order bandpass filter. A high-order bandpass filter is formed by cascading together two or more low-order bandpass filters. The bandwidths and center frequencies of each individual low-order bandpass filter is adjusted. The center frequency of some low-order bandpass filters are adjusted so as to achieve linear adjustment of the bandwidth of the high-order bandpass filter.
摘要翻译： 一种线性调整高阶带通滤波器带宽的方法和装置。 通过将两个或多个低阶带通滤波器级联在一起形成高阶带通滤波器。 调整各个低阶带通滤波器的带宽和中心频率。 调整一些低阶带通滤波器的中心频率，以实现高阶带通滤波器带宽的线性调整。
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公开(公告)号：US5726606A
公开(公告)日：1998-03-10
申请号：US682375
申请日：1996-07-17
申请人： Dale W. Marland
发明人： Dale W. Marland
摘要： A pre-emphasis network used in a television signal jamming encoder has a variable gain tuned amplifier first stage and an attenuable notch filter and variable gain broadband amplifier second stage. The notch filter is tuned to a center frequency above the television signal intermediate frequency's visual carrier frequency resulting in 15 dB of increased pre-emphasis and a time delay which compensates for a time delay imparted by a decoding network upon decoding of a signal jammed by this encoder.
摘要翻译： 在电视信号干扰编码器中使用的预加重网络具有可变增益调谐放大器第一级和可衰减陷波滤波器以及可变增益宽带放大器第二级。 陷波滤波器被调谐到高于电视信号中频的视频载波频率的中心频率，导致增加的预加重的15dB，以及补偿由此被卡住的信号解码时由解码网络给出的时间延迟的时间延迟 编码器。
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