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公开(公告)号：US5826180A
公开(公告)日：1998-10-20
申请号：US291251
申请日：1994-08-16
申请人： Mordechay Golan
发明人： Mordechay Golan
摘要： A radio frequency receiver and method for operating one is disclosed. The receiver includes a tuning unit, an inphase-quadrature (I/Q) mixer, and a calibrated image rejection processor. The tuning unit selectably tunes to a tuning frequency close but not equal to an input modulated radio frequency and creates thereby a periodic signal having the tuning frequency. The I/Q mixer convolves the modulated radio frequency signal with inphase and quadrature versions of the periodic signal and low pass filters the resultant signals. The calibrated image rejection processor corrects at least one of the filtered resultant signals and performs image rejection on the corrected signals.
摘要翻译： 公开了射频接收机及其操作方法。 接收机包括调谐单元，同相正交（I / Q）混频器和经校准的镜像抑制处理器。 调谐单元可选地调谐到调谐频率接近但不等于输入调制射频，从而产生具有调谐频率的周期信号。 I / Q混频器以周期信号的同相和正交版本卷积调制的射频信号，并对结果信号进行低通滤波。 经校准的镜像抑制处理器校正至少一个经滤波的合成信号并对校正的信号执行镜像抑制。
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公开(公告)号：US5678222A
公开(公告)日：1997-10-14
申请号：US321501
申请日：1994-10-12
申请人： Thomas Hornak , Andrew Z. Grzegorek , William J. McFarland , Richard C. Walker , Scott D. Willingham
发明人： Thomas Hornak , Andrew Z. Grzegorek , William J. McFarland , Richard C. Walker , Scott D. Willingham
IPC分类号： H04L27/34 , H03B19/00 , H03B27/00 , H03D7/00 , H03D7/14 , H03D7/16 , H03D7/18 , H04B1/10 , H04B1/26 , H04L27/18 , H04B1/16
CPC分类号： H03D7/00 , H03D7/1441 , H03D7/1483 , H03D7/165 , H03D7/18 , H03B19/00 , H03B2200/0064 , H03B27/00 , H03D2200/0017 , H03D2200/005 , H03D2200/006 , H03D2200/0078 , H03D2200/0082 , H03D7/161
摘要： A time-share mixer circuit and a frequency converter, an I-Q modulator, and an I-Q demodulator. A switching signal drives the time-share mixer circuit to alternate between two output signals. The first output signal represents the output of a mixer having a given signal input and a local oscillator signal with a first phase as its local oscillator input. The second output signal represents the output of the mixer having the same input signal and the local oscillator signal with a second phase that differs from the first phase by 90 degrees as its local oscillator input signal. The frequency converter uses the time-share mixer in combination with a switched output phase shifter that switches in sync with the phase of the local oscillator signal to generate a phase shifted output signal in which the time average of an undesired image signal is substantially reduced compared to time average of the desired signal. The phase shifted output signal is then amplified by a bandpass amplifier. A clocked inverter in series with one of the mixer ports provides improved performance by eliminating the need for two precisely phase-shifted local oscillator signals.
摘要翻译： 时分混频器电路和频率转换器，I-Q调制器和I-Q解调器。 开关信号驱动时间共享混频器电路在两个输出信号之间交替。 第一输出信号表示具有给定信号输入的混频器的输出和具有第一相位的本地振荡器信号作为其本地振荡器输入。 第二输出信号表示具有相同输入信号的混频器的输出和具有与第一相位相差90度的第二相位的本地振荡器信号作为其本地振荡器输入信号。 变频器使用时间共享混频器与开关输出移相器组合，其切换与本地振荡器信号的相位同步，以产生相移输出信号，其中期望图像信号的时间平均值大大减少 到期望信号的时间平均值。 相移输出信号然后被带通放大器放大。 与其中一个混频器端口串联的时钟反相器通过消除对两个精确相移的本地振荡器信号的需要而提高了性能。
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公开(公告)号：US5630225A
公开(公告)日：1997-05-13
申请号：US644733
申请日：1996-05-10
申请人： David W. Corman
发明人： David W. Corman
CPC分类号： H03D9/0633 , H03D7/18 , H04B1/26 , H04B1/28
摘要： A dielectric resonator image reject mixer and method comprises an amplifier for amplifying a receive frequency (RF) signal and outputting a first combined signal comprising a RF signal, a RF noise signal, and an image noise signal. A dielectric resonator image rejector is coupled to the amplifier. The dielectric resonator image rejector receives the first combined signal but outputs only a second combined signal comprising the RF signal and the RF noise signal to a mixer coupled to the dielectric resonator image rejector. The image noise signal is rejected by either reflection or resonant transmission to a resistor-terminated microstrip line. A mixer mixes the combined RF signal and the RF noise signal from the dielectric resonator image rejector with a local oscillation frequency signal, producing an intermediate frequency output signal.
摘要翻译： 介质谐振器图像抑制混频器和方法包括用于放大接收频率（RF）信号并输出包括RF信号，RF噪声信号和图像噪声信号的第一组合信号的放大器。 介质谐振器图像排出器耦合到放大器。 介质谐振器图像排出器接收第一组合信号，但是仅将包括RF信号和RF噪声信号的第二组合信号输出到耦合到介质谐振器图像排出器的混频器。 图像噪声信号被反射或谐振传输拒绝到电阻端接的微带线。 混合器将来自介质谐振器图像排出器的组合RF信号和RF噪声信号与本地振荡频率信号混合，产生中频输出信号。
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公开(公告)号：US5604927A
公开(公告)日：1997-02-18
申请号：US362621
申请日：1994-12-22
申请人： Paul A. Moore
发明人： Paul A. Moore
IPC分类号： H03G3/20 , H03D7/18 , H03H19/00 , H03J5/24 , H04B1/26 , H04B1/28 , H04B1/30 , H04B1/16 , H04B15/00
摘要： A radio receiver has a frequency down conversion stage including a first passive filter tuned to a lower frequency. An amplifier functioning as a voltage-to-current converter includes a resistor (60) which can be shunted by a second passive filter in response to actuation of symmetrically arranged switching devices. When the second passive filter shunts the resistor, the overall pass band is raised to a higher frequency. Additionally, the amplifier has a lower noise figure when the second passive filter shunts the transconductor.
摘要翻译： 无线电接收机具有降频转换级，其包括调谐到较低频率的第一无源滤波器。 用作电压 - 电流转换器的放大器包括响应于对称布置的开关装置的致动而可被第二无源滤波器分流的电阻器（60）。 当第二个无源滤波器分流电阻时，整个通带被提高到更高的频率。 此外，当第二无源滤波器分流跨导体时，放大器具有较低的噪声系数。
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公开(公告)号：US5530927A
公开(公告)日：1996-06-25
申请号：US272916
申请日：1994-07-01
申请人： Andrew D. Smith
发明人： Andrew D. Smith
CPC分类号： H04B1/26 , H03D9/06 , H03D2200/0023 , H03D2200/0082 , H03D7/18
摘要： A feed network parallel superconductive tunnel junction circuit that acts as a doubly balanced mixer and can be utilized as a millimeter wave satellite communications link. A quadrature-fed mixer circuit relies on a network of 90 degree couplers to feed signal and local oscillator power to four identical SIS detectors where SIS is a superconductor-insulator-superconductor layer construction. Power applied to either port is split equally to each detector, and the relative phase relationship of the signal and the LO is preserved. By selecting the appropriate polarity of the dc junction bias, the detected IF output of the SIS detectors adds coherently.
摘要翻译： 作为双平衡混频器的馈电网并联超导隧道结电路，可用作毫米波卫星通信链路。 正交馈电混频器电路依靠90度耦合器的网络将信号和本地振荡器功率馈送到四个相同的SIS检测器，其中SIS是超导体 - 绝缘体 - 超导体层结构。 施加到任一端口的功率均等地分配给每个检测器，并且保持信号和LO的相对相位关系。 通过选择直流结偏置的适当极性，检测到的SIS检测器的IF输出相加。
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公开(公告)号：US5493719A
公开(公告)日：1996-02-20
申请号：US269711
申请日：1994-07-01
申请人： Andrew D. Smith , Arnold H. Silver
发明人： Andrew D. Smith , Arnold H. Silver
CPC分类号： H01Q1/364 , H01Q23/00 , H03D9/06 , H04B1/26 , H03D2200/0023 , H03D2200/0082 , H03D7/18
摘要： A high frequency receiver detects and downconverts 50-1,000 GHz radio frequency signals using a receiver consisting of a lens and planar antenna, pre-amplifier, mixer, local oscillator, and IF-amplifier. The insulating dielectric lens is used to focus terahertz radio frequency signals onto the thin film antenna. The preamplifier amplifies these faint signals so that they can be downconverted into an intermediate frequency by the mixer and local oscillator. The mixer is a dual port device which provides isolation of the local oscillator and input signal to avoid saturation of the preamplifier. The IF amplifier boosts the amplitude of the downconverted IF signal produced by the mixer.
摘要翻译： 高频接收机使用由透镜和平面天线，前置放大器，混频器，本地振荡器和IF放大器组成的接收器来检测和下变频50-1,000 GHz的射频信号。 绝缘介电透镜用于将太赫兹射频信号聚焦到薄膜天线上。 前置放大器放大这些微弱的信号，使得它们可以通过混频器和本地振荡器下变频成中频。 混频器是双端口设备，提供本地振荡器和输入信号的隔离，以避免前置放大器的饱和。 IF放大器提升由混频器产生的下变频IF信号的幅度。
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公开(公告)号：US5410743A
公开(公告)日：1995-04-25
申请号：US75621
申请日：1993-06-14
摘要： A mixer separates IF components IF1, IF2 of the same frequency which are images of different frequency RF signals RF1, RF2 beating with a given LO signal. The LO signal is applied to a FET active power divider and applied to the drains of a pair of balanced FET mixing elements. The FETs for the active power divider are built from the same device structure as the FETs for the mixing elements sharing drain nodes. The RF signals are passed through a quadrature phase shifter and applied to the gates of the FET mixing elements. The mixed signals appear at the drains of FET mixing elements are applied to opposing ports of a second quadrature hybrid at whose output ports the separated IF output signals IF1, IF2 appear.
摘要翻译： 混频器分离与频率不同的RF信号RF1，RF2的图像的相同频率的IF分量IF1，IF2以给定的LO信号进行跳动。 LO信号施加到FET有功功率分配器并施加到一对平衡FET混合元件的漏极。 有源功率分配器的FET由与共享漏极节点的混频元件的FET相同的器件结构构成。 RF信号通过正交移相器并施加到FET混合元件的栅极。 混合信号出现在FET混合元件的漏极处，被施加到第二正交混合器的相对端口，在其输出端口处分离的IF输出信号IF1，IF2出现。
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公开(公告)号：US5355101A
公开(公告)日：1994-10-11
申请号：US973762
申请日：1992-11-09
申请人： Masaki Ichihara , Tsuguo Maru
发明人： Masaki Ichihara , Tsuguo Maru
摘要： A quadrature modulator substantially completely compensating a phase error existing between two quadrature carriers by calculating two corrected baseband signals. One corrected baseband signal is generated by adding a common phase component signal and an orthogonal phase component signal after multiplying the common phase component signal and the orthogonal component signal by a first factor a and a second factor b respectively. The other corrected baseband signal is generated by adding the orthogonal phase component signal and the common phase component signal after multiplying the orthogonal component signal and the common phase component signal by the first factor a and the second factor b respectively. The output signal Z of the quadrature modulator is generated by adding both the outputs X and Y of first and second modulating circuits each modulating a respective carrier by a respective corrected baseband signal. If the phase error is .alpha., the phase error is compensated by adopting the multiplying factors, for example, a=cos (.alpha./2) and b=sin (.alpha./2). In this case, output signal Z is expressed as Z=cos .alpha..multidot.cos (.omega.t+.phi.(t)+.alpha./2), which is free from an image signal.
摘要翻译： 正交调制器通过计算两个校正的基带信号，基本上完全补偿存在于两个正交载波之间的相位误差。 通过在公共相位分量信号和正交分量信号分别乘以第一因子α和第二因子b之后，通过相加公共相位分量信号和正交相位分量信号来生成一个校正的基带信号。 通过在将正交分量信号和公共相位分量信号分别乘以第一因子α和第二因子b之后相加正交相位分量信号和公共相位分量信号来产生另一个校正的基带信号。 正交调制器的输出信号Z是通过将各自的载波调制各自的校正基带信号的第一和第二调制电路的输出X和Y相加而产生的。 如果相位误差为α，则通过采用乘法因子例如a = cos（α/ 2）和b = sin（α/ 2）来补偿相位误差。 在这种情况下，输出信号Z表示为没有图像信号的Z =cosαxcos（ω+ t + phi（t）+α/ 2）。
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公开(公告)号：US4926500A
公开(公告)日：1990-05-15
申请号：US230638
申请日：1988-08-10
申请人： George I. Tsuda , Kernel S. Tsuhako
发明人： George I. Tsuda , Kernel S. Tsuhako
摘要： The invention comprises a frequency converter for converting an input frequency to an output frequency where the frequenicies are widely separated. The system includes a free running output oscillator adapted to be injection locked to an output frequency. A local oscillator having a frequency near the output frequency, has its signal mixed with the input frequency to obtain a signal containing sideband frequencies which are both above and below the local oscillator frequency. Means are provided for separating the sideband frequencies and applying one of the sidebands as an injection locking signal to the free running oscillator. In the preferred embodiment, the bandwidth of the free running output oscillator is centered above the highest sideband frequency if the sideband is lower in frequency than the frequency of the local oscillator or is centered below the lowest sideband frequency is the sideband is higher in frequency than the frequency of the local oscillator.
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公开(公告)号：US4801900A
公开(公告)日：1989-01-31
申请号：US135167
申请日：1987-12-18
申请人： Vaughn L. Mower
发明人： Vaughn L. Mower
CPC分类号： H03C1/60
摘要： An image reject apparatus for covering a broad range of signal systhesis frequencies is provided with a digital phase shifter having an input for receiving modulated signals at twice the desired output frequency. A modulator comprising a power divider having a radio frequency (RF) input, a pair of mixers coupled to the outputs of said digital phase shifter and to the outputs from said power divider provides mixer output signals which are combined to produce sum and difference product signals as desired side band signals.
摘要翻译： 用于覆盖宽范围的信号合成频率的图像拒绝装置具有数字移相器，该数字移相器具有用于以两倍所需输出频率接收调制信号的输入。 一种调制器，包括具有射频（RF）输入的功率分配器，耦合到所述数字移相器的输出和来自所述功率分配器的输出的一对混频器，提供混合器输出信号，其被组合以产生和和差产品信号 作为期望的边带信号。
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