公开(公告)号：US06263199B1

公开(公告)日：2001-07-17

申请号：US09211168

申请日：1998-12-14

申请人： Klaas Wortel ,  Dennis L. Welty

发明人： Klaas Wortel ,  Dennis L. Welty

IPC分类号： H04B126

CPC分类号： H03D7/1441 ,  H03D7/1458 ,  H03D2200/0033 ,  H03D2200/0084

摘要： A mixer (20) has a differential transistor pair (22, 24) receiving first and second reference currents at first and second nodes (30, 34). An RF signal drives the differential transistor pair. A first switching circuit (44, 46) is coupled to the first node and a second switching circuit (52, 54) is coupled to the second node. An LO signal drives the first and second switching circuits. The first and second switching circuit each have first and second outputs that are cross-coupled at output nodes (48, 50) to provide a differential IF output current representative of the sum and difference between the frequency of the RF signal and the frequency of the LO signal.

摘要翻译： 混频器（20）具有在第一和第二节点（30,34）处接收第一和第二参考电流的差分晶体管对（22,24）。 RF信号驱动差分晶体管对。 第一开关电路（44,46）耦合到第一节点，并且第二开关电路（52,54）耦合到第二节点。 LO信号驱动第一和第二开关电路。 第一和第二开关电路各自具有在输出节点（48,50）处交叉耦合的第一和第二输出，以提供代表RF信号的频率和RF信号的频率之间的和和之差的差分IF输出电流 LO信号。

公开(公告)号：US06236847B1

公开(公告)日：2001-05-22

申请号：US09050594

申请日：1998-03-30

申请人： Eduard F. Stikvoort

发明人： Eduard F. Stikvoort

IPC分类号： H04B126

CPC分类号： H03D7/166 ,  H03H7/06 ,  H03H7/21 ,  H03H2007/0192

摘要： In a receiver the input signal is converted by a mixer into two quadrature IF signals. The quadrature IF signals are amplified by an amplifier and filtered by a filter. A polyphase filter suppresses signals having frequencies above a predetermined frequency. A second mixer converts the filtered IF signal into a second IF signal. This second IF signal is filtered by a second polyphase filter which suppresses signals having a frequency below a predetermined frequency. In this way a band-pass transfer function is obtained having a first edge defined by the first polyphase filter and having the second defined by the second polyphase filter. In an embodiment of the invention, the cut off frequencies of the polyphase filters are equal to zero, resulting in a transfer function for the complete receiver having cut off frequencies independent from the component values use in the polyphase filters.

摘要翻译： 在接收机中，输入信号由混频器转换成两个正交IF信号。 正交IF信号由放大器放大并由滤波器滤波。 多相滤波器抑制频率高于预定频率的信号。 第二混频器将滤波的IF信号转换成第二IF信号。 该第二IF信号被抑制频率低于预定频率的信号的第二多相滤波器滤波。 以这种方式，获得具有由第一多相滤波器限定的第一边缘并且具有由第二多相滤波器限定的第二边缘的带通传递函数。 在本发明的一个实施例中，多相滤波器的截止频率等于零，导致具有独立于多相滤波器中使用的分量值的截止频率的完整接收机的传递函数。

公开(公告)号：US06813485B2

公开(公告)日：2004-11-02

申请号：US09838387

申请日：2001-04-20

申请人： David F. Sorrells ,  Michael J. Bultman ,  Robert W. Cook ,  Richard C. Looke ,  Charley D. Moses, Jr. ,  Gregory S. Rawlins ,  Michael W. Rawlins

发明人： David F. Sorrells ,  Michael J. Bultman ,  Robert W. Cook ,  Richard C. Looke ,  Charley D. Moses, Jr. ,  Gregory S. Rawlins ,  Michael W. Rawlins

IPC分类号： H04B126

CPC分类号： H04B7/12 ,  H03C1/62 ,  H03D7/00

摘要： Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting and up-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (½, 1½, 2½, etc.) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal. Up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency.

摘要翻译： 这里描述了用于电磁（EM）信号的下变频和上变频的方法，系统和装置及其组合和子组合。 简言之，在实施例中，本发明通过接收EM信号并且在载波信号的近似半周期（½，1½，2½等）上递归地操作）来操作。 可以以载波信号的次谐波速率执行递归运算。 本发明积累了递归运算的结果，并使用累加结果形成降频转换信号。 在一个实施例中，EM信号被下变频到中频（IF）信号。 在另一个实施例中，EM信号被下变频为基带信息信号。 在另一个实施例中，EM信号是频率调制（FM）信号，其被下变频成非FM信号，例如相位调制（PM）信号或幅度调制（AM）信号。 通过控制具有振荡信号的开关来实现上转换，将振荡信号的频率选择为所需输出频率的次谐波。

公开(公告)号：US06810241B1

公开(公告)日：2004-10-26

申请号：US10058279

申请日：2002-01-30

申请人： Mike L. Salib

发明人： Mike L. Salib

IPC分类号： H04B126

CPC分类号： H03D9/0633

摘要： A mixer having a diode quad, and which receives two RF signals at an RF input balun having primary and secondary windings. A resonant circuit arrangement includes at least a capacitor circuit element in parallel with the secondary winding to form an open circuit termination for the second harmonics of the input RF signals.

摘要翻译： 具有二极管四极管并且在具有初级和次级绕组的RF输入平衡 - 不平衡变换器上接收两个RF信号的混频器。 谐振电路装置至少包括与次级绕组并联的电容器电路元件，以形成输入RF信号的二次谐波的开路端接。

公开(公告)号：US06760577B2

公开(公告)日：2004-07-06

申请号：US09821367

申请日：2001-03-29

申请人： Frank Xiaohui Li

发明人： Frank Xiaohui Li

IPC分类号： H04B126

CPC分类号： H03D7/18 ,  H04B1/30

摘要： Alignment methods and apparatus for I/Q phase and amplitude error correction and image rejection improvement that may be used at the time of circuit fabrication or on chip for use during operation. The alignment method may be used to improve the I/Q phase and amplitude accuracy of a direct conversion transceiver or to improve image rejection in an up or downconversion mixer. For alignment purposes, a pilot tone of a selected frequency is used to provide a calibration reference, with adjustments being made in phase and amplitude to drive the I and Q phase and amplitude mismatch toward a minimum.

摘要翻译： 用于在电路制造时或片上使用的I / Q相位和幅度误差校正和图像抑制改进的对准方法和装置在操作期间使用。 可以使用对准方法来改善直接转换收发器的I / Q相位和幅度精度，或者改善上变频或下变频混频器中的图像抑制。 为了对准目的，使用选定频率的导频音来提供校准参考，调整相位和幅度以将I和Q相位和幅度失配向最小化。

公开(公告)号：US06711395B1

公开(公告)日：2004-03-23

申请号：US09694423

申请日：2000-10-23

申请人： Ken Tonegawa ,  Yoshihiro Yoshimoto ,  Norihiro Shimada ,  Jun Sasaki ,  Tomoya Bando

发明人： Ken Tonegawa ,  Yoshihiro Yoshimoto ,  Norihiro Shimada ,  Jun Sasaki ,  Tomoya Bando

IPC分类号： H04B126

CPC分类号： H03D7/1425 ,  H03D7/1433 ,  H03D7/1458 ,  H03D2200/0023

摘要： A receiving module and a TDMA-system receiver are adapted to broadening of bands of received signals and low frequencies of intermediate frequency signals. These apparatuses can be made compact and contribute to cost reduction. The receiving module is constituted of a low-noise amplifier, a high frequency LC filter, a Gilbert-cell type mixer, and baluns. A signal received by an antenna is amplified by the low-noise amplifier and is passed through the LC filter. After that, the signal is mixed with a local oscillation signal by the Gilbert-cell type mixer to be converted into an intermediate frequency signal.

摘要翻译： 接收模块和TDMA系统接收机适用于加宽接收信号的频带和中频信号的低频。 这些装置可以制造得紧凑并有助于降低成本。 接收模块由低噪声放大器，高频LC滤波器，吉尔伯特单元型混频器和平衡 - 不平衡变换器构成。 由天线接收的信号由低噪声放大器放大并通过LC滤波器。 之后，该信号与Gilbert-cell型混频器与本地振荡信号混合，以转换成中频信号。

公开(公告)号：US06708026B1

公开(公告)日：2004-03-16

申请号：US09481248

申请日：2000-01-11

申请人： Nikolaus Klemmer ,  Antonio J. Montalvo ,  Steven L. White

发明人： Nikolaus Klemmer ,  Antonio J. Montalvo ,  Steven L. White

IPC分类号： H04B126

CPC分类号： H03L7/1976 ,  H03D7/163

摘要： A programmable digital divider operates under the control of a division controller to derive a second synthesized frequency based on a first synthesized frequency. The programmable divider divides the first synthesized signal to derive the second synthesized signal. The division amount is an integer, but varies between integer values if necessary to achieve a non-integer average division value. The majority of the noise generated by the frequency synthesizer is generated away from the centerline frequency and is easily filtered by narrowband filter. The frequency synthesizer may optionally be incorporated into a modified phase-locked loop to generate the second synthesized signal. By using a digital divider, instead of a traditional phase-locked loop, these embodiments allow for integration of the frequency synthesizer onto an integrated circuit, thereby lowering cost and improving resistance to noise spurs. This approach is particularly suited to telecommunications applications.

摘要翻译： 可编程数字分频器在分频控制器的控制下操作，以基于第一合成频率导出第二合成频率。 可编程分频器分割第一合成信号以导出第二合成信号。 分割量是一个整数，但如果需要，可以在整数值之间变化，以获得非整数平均除法值。 由频率合成器产生的大部分噪声是从中心线频率产生的，并且容易被窄带滤波器滤波。 频率合成器可以可选地并入修改的锁相环以产生第二合成信号。 通过使用数字分频器而不是传统的锁相环，这些实施例允许将频率合成器集成到集成电路上，从而降低成本并提高对噪声的抵抗力。 这种方法特别适用于电信应用。

公开(公告)号：US06687493B1

公开(公告)日：2004-02-03

申请号：US09293342

申请日：1999-04-16

申请人： David F. Sorrells ,  Michael J. Bultman ,  Robert W. Cook ,  Richard C. Looke ,  Charley D. Moses, Jr. ,  Michael W. Rawlins ,  Gregory S. Rawlins

发明人： David F. Sorrells ,  Michael J. Bultman ,  Robert W. Cook ,  Richard C. Looke ,  Charley D. Moses, Jr. ,  Michael W. Rawlins ,  Gregory S. Rawlins

IPC分类号： H04B126

CPC分类号： H04L27/3881 ,  H03C1/62 ,  H03D7/00 ,  H03D7/1441 ,  H03D7/1475 ,  H04B1/0025 ,  H04B1/16 ,  H04B1/28 ,  H04B7/12 ,  H04L25/08 ,  H04L27/00 ,  H04L27/06 ,  H04L27/12 ,  H04L27/14 ,  H04L27/148 ,  H04L27/156 ,  H04L27/2672

摘要： Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.

摘要翻译： 这里描述了通过使EM信号进行混叠来降低电磁（EM）信号的转换的方法，系统和装置。 简要地说，这样的方法，系统和装置通过接收具有混叠速率的EM信号和混叠信号来操作。 EM信号根据混叠信号进行混叠，以降低EM信号的转换。 如本文所使用的，术语混叠是指通过以混叠速率对EM信号进行欠采样，并以混叠速率从EM信号传输能量来对EM信号进行下变频来对EM信号进行下变频。 在一个实施例中，EM信号被下变频到中频（IF）信号。 在另一实施例中，EM信号被下变频为解调的基带信息信号。 在另一个实施例中，EM信号是频率调制（FM）信号，其被下变频成非FM信号，例如相位调制（PM）信号或幅度调制（AM）信号。

公开(公告)号：US06665528B2

公开(公告)日：2003-12-16

申请号：US09876258

申请日：2001-06-06

申请人： Brian J. McNamara ,  Heinz Banzer ,  Ludger Verweyen

发明人： Brian J. McNamara ,  Heinz Banzer ,  Ludger Verweyen

IPC分类号： H04B126

CPC分类号： H03D7/125

摘要： A dual band mixer has a common node for at least one radio frequency input and an intermediate frequency output. The dual band mixer also has a first transistor with a gate coupled to a first local oscillator input and a drain coupled to the common node, and a second transistor with a gate coupled to a second local oscillator input and a drain coupled to the common node. Interconnection circuitry turns off the second transistor when the first local oscillator input signal is applied to the first transistor, and turns off the first transistor when the second local oscillator input signal is applied to the second transistor.

公开(公告)号：US06654596B1

公开(公告)日：2003-11-25

申请号：US09492381

申请日：2000-01-27

申请人： Jan Peter Jakobsson ,  Sven Erik Niklas Stenström

发明人： Jan Peter Jakobsson ,  Sven Erik Niklas Stenström

IPC分类号： H04B126

CPC分类号： H04B1/30 ,  H03D3/008

摘要： A homodyne radio receiver apparatus receives radio frequency signal bursts containing a number of symbols and generates digital samples of at least a complex base band signal (I and Q) of each signal burst. A DC compensator comprises an average calculator (8,8′), which determines an average DC-level of said samples, and a signed square sum calculator (9,9′), which calculates a signed square sum of a plurality of said samples and weights the square sum by a compensation factor. Correction means (10,10′) subtracts the square sum from an output of said average calculator means for forming the DC-level estimate.

摘要翻译： 零差无线电接收机装置接收包含多个符号的射频信号脉冲串，并生成至少每个信号脉冲串的复基带信号（I和Q）的数字样本。 直流补偿器包括确定所述样本的平均直流电平的平均计算器（8,8'）和有符号的平方和计算器（9,9'），其计算多个所述样本的有符号平方和 并将平方和加权补偿因子。 校正装置（10,10'）从用于形成直流电平估计的所述平均计算器装置的输出中减去平方和。