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1. 发明申请

US20140266454A1 LNA with Linearized Gain Over Extended Dynamic Range 有权
标题翻译： LNA具有线性化增益超过动态范围
公开(公告)号：US20140266454A1
公开(公告)日：2014-09-18
申请号：US13839462
申请日：2013-03-15
申请人： INNOPHASE, INC.
发明人： Nicolo Testi , Xi Li , Xuejun Zhang , Yang Xu
IPC分类号： H03G3/00
CPC分类号： H03G3/008 , H03G1/0029 , H03G1/0088 , H03G5/14 , H03G5/24
摘要： A low noise amplifier including a variable gain amplifier stage configured to accept an input signal and to provide a load driving signal; a tunable bandpass filter connected as a load to the variable gain amplifier stage, wherein the bandpass filter includes a cross-coupled transistor pair, and at least one cross-coupled compensation transistor pair biased in a subthreshold region configured to add a transconductance component when the load driving signal is of a magnitude large enough to decreases a transconductance of the cross-coupled transistor pair; and, a controller circuit configured to tune the bandpass filter. The filter can be tuned in respect to the frequency and the quality factor Q.
摘要翻译：一种低噪声放大器，包括可变增益放大器级，其被配置为接受输入信号并提供负载驱动信号; 作为负载连接到可变增益放大器级的可调谐带通滤波器，其中所述带通滤波器包括交叉耦合晶体管对，以及偏置在亚阈值区域中的至少一个交叉耦合补偿晶体管对，其配置成当所述跨导分量负载驱动信号的幅度足够大以减小交叉耦合晶体管对的跨导; 以及配置为调谐带通滤波器的控制器电路。滤波器可以根据频率和质量因子Q进行调整。

2. 发明授权

US4001709A Active dual channel tuning control 失效
标题翻译：主动双通道调谐控制
公开(公告)号：US4001709A
公开(公告)日：1977-01-04
申请号：US618272
申请日：1975-09-30
申请人： Matthew Clinkscales
发明人： Matthew Clinkscales
IPC分类号： H03F3/68 , H03G5/14 , H04B1/16
CPC分类号： H03G5/14 , H03F3/68 , H04B1/1646
摘要： An active dual channel tuning control particularly useful for television and stereo applications has two independently adjustable channels. For example, each channel for stereo has an input for receiving a decoded signal which represents the left or right channel information. Each channel additionally has a feedback amplifier with an adjustably turned output to permit highly selective tuning and impedance matching to the following amplification stages. Switching networks are provided for reversing the channel outputs as well as for selectively inhibiting either of the channel outputs in either the normal or reversed channel condition.

3. 发明授权

US09257951B2 Differential amplifier 有权
标题翻译：差分放大器
公开(公告)号：US09257951B2
公开(公告)日：2016-02-09
申请号：US13891615
申请日：2013-05-10
申请人： Red Lion 49 Limited
发明人： David Joseph Mate
IPC分类号： H03F99/00 , H03G1/00 , H03F3/183 , H03F3/45 , H03G3/00 , H03G3/30 , H03G5/14
CPC分类号： H03G1/00 , H03F3/183 , H03F3/45098 , H03F3/45502 , H03F2200/411 , H03F2203/45682 , H03G1/0023 , H03G1/0029 , H03G3/001 , H03G3/301 , H03G5/14
摘要： An amplifier for amplifying a differential audio signal, having common-mode rejection and digital gain control, includes a current source (401) which supplies a constant level of current to a first current path (I1) and a second current path (I2), and input stage (403) which modulates the current in the current paths in response to a differential input signal, and an output stage (405) which produces an output signal by amplifying the difference in current between the current paths, a degree of feedback provided to the input stage by a feedback stage (402) that modulates the current in the current paths in response to the output signal, and the degree of modulation by the feedback stage is determined by the attenuation provided by at least one multiplying digital-to-analog converter (407) located therein.
摘要翻译：用于放大具有共模抑制和数字增益控制的差分音频信号的放大器包括向第一电流路径（I1）和第二电流路径（I2）提供恒定电平的电流源（401）以及输入级（403），其响应于差分输入信号调制电流路径中的电流;以及输出级（405），其通过放大电流路径之间的电流差产生输出信号，提供反馈程度通过响应于输出信号调制电流路径中的电流的反馈级（402）到达输入级，并且由反馈级的调制程度由至少一个乘法数字 - 模拟转换器（407）。

4. 发明授权

US4210942A Video signal play-back circuit 失效
标题翻译：视频信号回放电路
公开(公告)号：US4210942A
公开(公告)日：1980-07-01
申请号：US883155
申请日：1978-03-03
申请人： Hisashi Nakamura , Toshiyuki Akiyama , Akira Shibata , Yoichi Tokunaga
发明人： Hisashi Nakamura , Toshiyuki Akiyama , Akira Shibata , Yoichi Tokunaga
IPC分类号： H04N5/93 , G11B5/027 , G11B5/035 , H03G5/14 , G11B5/45 , G11B5/02
CPC分类号： G11B5/035 , H03G5/14
摘要： In a video signal play-back circuit connected so that a play-back signal from a magnetic head may be applied to an amplifier circuit through a resonance circuit which consists of an inductance element and a capacitance element, a resistor for adjusting the quality factor Q of the resonance circuit is connected between one terminal of the resonance circuit and one output terminal of the amplifier circuit, thereby to reduce thermal noises which develop from the Q adjusting resistor.
摘要翻译：在连接使得来自磁头的回放信号可以通过由电感元件和电容元件构成的谐振电路施加到放大器电路的视频信号回放电路中，用于调节质量因子Q 谐振电路的一端与放大电路的一个输出端连接，从而减少由Q调整电阻产生的热噪声。

5. 发明授权

US3991374A Controllable bandwidth IF filter circuit for radio receivers 失效
标题翻译：无线电接收机的可控带宽中频滤波电路
公开(公告)号：US3991374A
公开(公告)日：1976-11-09
申请号：US553278
申请日：1975-02-26
申请人： Antal Csicsatka , Henry P. Lee
发明人： Antal Csicsatka , Henry P. Lee
IPC分类号： H03H7/12 , H03G5/14 , H04H20/89 , H04B1/16
CPC分类号： H04H20/89 , H03G5/14
摘要： Controllable bandwidth IF filter circuit for radio receivers generally, but having particular application to quadraphonic radio receivers intended for use in a quadraphonic system that is compatible with existing monophonic and biphonic equipment, said filter circuit being automatically adjusted in a digital manner to exhibit one of several different bandwidths in response to a pair of transmitted control signals present in the quadraphonic transmission so as to provide optimum receiver operation for the particular mode of broadcast being received, especially in terms of an improved protection ratio and signal to noise ratio for the received signal. The noted bandwidth adjustments are accomplished by modifying the values for certain of the component in the filter's tuned circuit and coupling sections through their selective connection into the circuit by means of semiconductor switching devices operated in response to said pair of control signals.
摘要翻译：通常用于无线电接收机的可控带宽IF滤波器电路，但是具有专门应用于与现有单声道和双声道设备兼容的四音系统中的四声道无线电接收机的特定应用，所述滤波器电路以数字方式自动调整以呈现几个响应于在第四传输中存在的一对传输的控制信号的不同带宽，以便为接收的特定的广播方式提供最佳的接收机操作，特别是在接收信号的改进的保护比和信噪比方面。通过通过响应于所述一对控制信号而操作的半导体开关装置，通过将滤波器的调谐电路中的某些分量的值修改并通过其选择性连接到电路中来实现所述带宽调整。

6. 发明授权

US3569852A Frequency selective variable gain amplifier 失效
标题翻译：频率选择性可变增益放大器
公开(公告)号：US3569852A
公开(公告)日：1971-03-09
申请号：US3569852D
申请日：1969-01-23
申请人： AMERICAN OPTICAL CORP
发明人： BERKOVITS BAROUH V
IPC分类号： G01R13/20 , A61B5/04 , A61B5/0428 , A61B5/0432 , H03F1/26 , H03G5/14 , H03G5/16 , H03G5/18
CPC分类号： H03F1/26 , A61B5/04004 , A61B5/0432 , H03G5/14 , H03G5/18 , Y10S128/901
摘要： An amplifier for an electrocardiographic monitoring system. The band-pass of the amplifier is such that ordinarily all frequency components of the ECG signal are amplified to the same extent. In the presence of a low frequency noise signal which causes the output voltage to exceed a maximum limit in either direction, the low frequency 3-db. point is raised from .05 Hertz to 1.0 Hertz. This is achieved simply by lowering the time constant of a high pass filter in the amplifier. The shorter time constant reduces the effect of low frequency noise on the output voltage. While some of the low frequency components in the ECG signal are attenuated, most of the usable information in the signal is retained. The shorter time constant also provides a faster recovery for the amplifier following large direct current voltage changes. This is especially beneficial when the patient electrodes of the monitoring system are switched and they induce a charge in the DC component of the ECG signal which might saturate the ECG preamplifier. Similarly, in the presence of high frequency noise signals the high frequency 3-db. point is lowered for a similar purpose.

7. 发明授权

US06738604B2 Programmable IF bandwidth using fixed bandwidth filters 失效
标题翻译：可编程IF带宽使用固定带宽滤波器
公开(公告)号：US06738604B2
公开(公告)日：2004-05-18
申请号：US09919693
申请日：2001-07-31
申请人： Scott T. Swazey
发明人： Scott T. Swazey
IPC分类号： H01Q1112
CPC分类号： H04B1/1036 , H03G5/14
摘要： A programmable IF bandwidth is achieved in either a transmitter or receiver using fixed bandwidth filters. A minimum of two IF frequencies are used. A fixed bandwidth filter that is equal to or greater than the desired IF bandwidth is used at each IF. The Local Oscillators (LO's) are tuned to frequency convert the desired signal to a frequency that is offset towards one bandedge of the fixed IF filters. A first mixer and LO relocates the desired signal to one end of a first fixed IF filter. A second mixer and LO relocates the filtered signal to the opposite end of a second IF filter. The desired bandwidth is obtained as the sum of the frequency offset of the desired signal from the nearest bandedge of the first IF filter and the frequency offset of the desired signal from the opposite bandedge of the second IF filter.
摘要翻译：在使用固定带宽滤波器的发射机或接收机中实现可编程IF带宽。至少使用两个IF频率。在每个IF处使用等于或大于期望的IF带宽的固定带宽滤波器。本地振荡器（LO）被调谐以将期望的信号频率转换为固定IF滤波器的一个带边偏移的频率。第一混频器和LO将期望的信号重定位到第一固定IF滤波器的一端。第二混频器和LO将滤波后的信号重定位到第二IF滤波器的相对端。期望的带宽被获得为来自第一IF滤波器的最近的带边的期望信号的频率偏移和来自第二IF滤波器的相对带边的期望信号的频率偏移的和。

8. 发明授权

US5382920A Circuit arrangement for an optical receiver 失效
标题翻译：光接收机的电路装置
公开(公告)号：US5382920A
公开(公告)日：1995-01-17
申请号：US46768
申请日：1993-04-13
申请人： Reinhold Jung
发明人： Reinhold Jung
IPC分类号： H03G3/20 , H03G5/14 , H04B10/69 , H03F3/08
CPC分类号： H04B10/6933 , H03G3/3084 , H03G5/14
摘要： Optical receivers with a photodiode (PD) and a transimpedance amplifier are optimized for signals with a particular transmission rate. A circuit is provided whereby the optical receiver can be adapted to different transmission rates. To attain this object, the feedback resistor of the transimpedance amplifier is divided into at least two resistors (R.sub.F1, R.sub.F2) connected in series. According to the transmission rate, the respective optimum resistance value is switched into the negative-feedback path with the aid of a control circuit. This makes it possible to operate such a universal optical receiver in a broadband subscriber interface both at a transmission rate of 150 Mb/s and at a transmission rate of 600 Mb/s, for example.
摘要翻译：具有光电二极管（PD）和跨阻放大器的光接收器针对具有特定传输速率的信号进行了优化。提供了一种电路，由此光接收器可以适应于不同的传输速率。为了达到这个目的，跨阻放大器的反馈电阻被分成串联连接的至少两个电阻（RF1，RF2）。根据传输速率，借助于控制电路将相应的最佳电阻值切换到负反馈路径。这使得可以在例如150Mb / s的传输速率和600Mb / s的传输速率的宽带用户接口中操作这样的通用光接收机。

9. 发明授权

US4672671A Audio frequency signal preamplifier for providing controlled output signals 失效
标题翻译：用于提供受控输出信号的音频信号前置放大器
公开(公告)号：US4672671A
公开(公告)日：1987-06-09
申请号：US677225
申请日：1984-12-03
申请人： Bruce L. Kennedy
发明人： Bruce L. Kennedy
IPC分类号： G10H1/16 , H03G5/14 , H03G3/00
CPC分类号： H03G5/14 , G10H1/16 , Y10S84/09 , Y10S84/26
摘要： A preamplifier adapted to receive audio frequency electrical signals generated by a musical instrument for providing controlled output signals therefrom having selected distortion and harmonic signal content is shown wherein the preamplifier includes an amplifier for amplifying audio frequency electrical signals generated by the musical instrument, a first electrical signal processing channel operatively coupled to the amplifier for receiving the amplified audio frequency electrical signals and for producing in response thereto a first controlled output signal wherein the first electrical signal processing channel includes a plurality of selectively interconnectable signal processing circuits at least one of which is capable of at least one of selectively amplifying, distorting and adding preselected harmonic content to the first controlled output signal, a second electrical processing channel operatively coupled to the amplifier for receiving the amplified audio electrical signals and for producing response thereto a second controlled output signal and wherein the second electrical processing channel includes a plurality of selectively interconnectable signal processing means at least one of which is capable of at least one of selectively amplifying, distorting and adding preselected harmonic content to the second controlled amplitude output signal and an output circuit operatively coupled to the first and second electrical signal processing channels for selectively applying one of the first and second controlled output signals to an output terminal is shown. A method for providing controlled output signals having selected distortion and harmonic signal content is also shown.
摘要翻译：示出了适于接收由乐器产生的音频电信号的前置放大器，用于从其提供具有所选失真和谐波信号内容的受控输出信号，其中前置放大器包括用于放大由乐器产生的音频电信号的放大器，信号处理通道，其可操作地耦合到放大器，用于接收放大的音频电信号，并响应于此产生第一受控输出信号，其中第一电信号处理通道包括多个选择性互连的信号处理电路，其中至少一个能够选择性地放大，失真和将预选谐波内容添加到第一受控输出信号中的至少一个;操作地耦合到放大器的第二电处理通道，用于接收放大的音频电信号;以及用于产生对其的第二受控输出信号的响应，并且其中所述第二电处理通道包括多个选择性可互连的信号处理装置，其中的至少一个能够选择性地放大，失真和将预选谐波内容相加于所述第二受控输出信号幅度输出信号和可操作地耦合到第一和第二电信号处理通道的输出电路，用于选择性地将第一和第二受控输出信号中的一个施加到输出端。还示出了提供具有选择的失真和谐波信号内容的受控输出信号的方法。

10. 发明授权

US4178551A Bandwidth switching circuits of radio receiver 失效
标题翻译：无线电接收机的带宽切换电路
公开(公告)号：US4178551A
公开(公告)日：1979-12-11
申请号：US850310
申请日：1977-11-10
申请人： Minoru Ogita , Yuzo Ishigaki
发明人： Minoru Ogita , Yuzo Ishigaki
IPC分类号： H03G5/02 , H03G5/14 , H04B1/10 , H04B1/16 , H04B1/06
CPC分类号： H04B1/1646 , H03G5/14
摘要： A plurality of parallel branch paths are connected in an intermediate frequency or high frequency amplifying circuit of a radio receiver for the purpose of switching the bandwidth. Between an intermediate point of each branch path and the ground is connected output electrodes of a transistor, and the base electrode of the transistor is selectively connected to a source of control voltage via a transfer switch to render the selected transistor conductive.
摘要翻译：为了切换带宽，在无线电接收机的中频或高频放大电路中连接多个并行分支路径。在每个分支路径的中间点和地之间连接晶体管的输出电极，并且晶体管的基极通过转换开关选择性地连接到控制电压源，以使所选晶体管导通。

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