公开(公告)号：US20070049220A1

公开(公告)日：2007-03-01

申请号：US11211565

申请日：2005-08-26

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H04B1/04 ,  H01Q11/12

CPC classification number: H04B1/0475 ,  H03D2200/009

Abstract: A transmitter includes a first mixer to generate a first output signal by up-converting a first baseband signal having a first DC offset component. A second mixer generates a second output signal by up-converting a second baseband signal having a second DC offset component. The second output signal is subtracted from the first output signal to generate a transmitter output signal. The transmitter output signal includes a local oscillator (LO) leakage signal caused by the first and/or second DC offset components. A third mixer produces a third output signal by up-converting the first DC offset component. A fourth mixer produces a fourth output signal by up-converting the second DC offset component. The fourth output signal is subtracted from the third output signal to generate a LO leakage cancellation signal. The LO leakage cancellation signal is subtracted from the transmitter output signal, thereby reducing a power of the LO leakage signal.

Abstract translation: 发射机包括第一混频器，用于通过对具有第一DC偏移分量的第一基带信号进行上变频来产生第一输出信号。 第二混频器通过对具有第二DC偏移分量的第二基带信号进行上变频来产生第二输出信号。 从第一输出信号中减去第二输出信号以产生发射机输出信号。 发射机输出信号包括由第一和/或第二DC偏移分量引起的本地振荡器（LO）泄漏信号。 第三混频器通过对第一DC偏移分量进行上变频来产生第三输出信号。 第四混频器通过对第二DC偏移分量进行上变频来产生第四输出信号。 从第三输出信号中减去第四输出信号以产生LO泄漏消除信号。 从发送器输出信号中减去LO泄漏消除信号，从而降低LO泄漏信号的功率。

公开(公告)号：US20070042728A1

公开(公告)日：2007-02-22

申请号：US11204339

申请日：2005-08-16

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H04B1/04 ,  H01Q11/12 ,  H04B1/00 ,  H04B15/00

CPC classification number: H04B1/30

Abstract: A transmitter generates a transmitter output signal from first and second baseband signals. The transmitter includes a detector to detect a local oscillator (LO) leakage signal in the transmitter output signal. A controller coupled to the detector determines a direct LO coupling component and a baseband DC offset component of the LO leakage signal. First and second variable current sources are adjusted by the controller to provide first and second DC offsets to the first and second baseband signals, respectively. The first and second DC offsets reduce the direct LO coupling component. Third and fourth variable current sources are subsequently adjusted by the controller to provide third and fourth DC offsets to the first and second baseband signals, respectively. The third and fourth DC offsets reduce the baseband DC component. Overall, reducing the direct LO coupling component and the baseband DC component reduces a power of the LO leakage signal.

Abstract translation: 发射机从第一和第二基带信号产生发射机输出信号。 发射机包括检测器，用于检测发射机输出信号中的本地振荡器（LO）泄漏信号。 耦合到检测器的控制器确定LO泄漏信号的直接LO耦合分量和基带DC偏移分量。 控制器调整第一和第二可变电流源，以分别向第一和第二基带信号提供第一和第二DC偏置。 第一和第二直流偏移减少直接LO耦合分量。 随后由控制器调整第三和第四可变电流源，以分别向第一和第二基带信号提供第三和第四DC偏置。 第三和第四直流偏移减少了基带直流分量。 总之，减少直流LO耦合分量和基带DC分量降低了LO泄漏信号的功率。

公开(公告)号：US20070002968A1

公开(公告)日：2007-01-04

申请号：US11169008

申请日：2005-06-29

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H04L27/36

CPC classification number: H03C3/40

Abstract: A transmitter includes a first amplifier to amplify an in-phase oscillator signal to produce an in-phase mixing signal and a second amplifier to amplify a quadrature-phase oscillator signal to produce a quadrature-phase mixing signal. A first mixer mixes the in-phase mixing signal with a first information signal to produce a first output signal. A second mixer mixes the quadrature-phase mixing signal with a second information signal to produce a second output signal. The first output signal and an inverted second output signal are summed to produce a transmitter output signal that includes an image signal caused by a phase imbalance between the in-phase and quadrature-phase mixing signals. An image monitor monitors the image signal and reduces or eliminates the phase imbalance by independently adjusting a phase of the in-phase mixing signal and/or a phase of the quadrature-phase mixing signal. Consequently, a power of the image signal is reduced or eliminated.

Abstract translation: 发射机包括第一放大器，用于放大同相振荡器信号以产生同相混合信号;以及第二放大器，放大正交相位振荡器信号以产生正交相混频信号。 第一混频器将同相混合信号与第一信息信号混合以产生第一输出信号。 第二混频器将正交相混合信号与第二信息信号混合以产生第二输出信号。 将第一输出信号和反相第二输出信号相加以产生包括由同相和正交相混频信号之间的相位不平衡引起的图像信号的发射机输出信号。 图像监视器监视图像信号，并且通过独立地调整同相混合信号的相位和/或正交相位混合信号的相位来减小或消除相位不平衡。 因此，减少或消除了图像信号的功率。

公开(公告)号：US20060214728A1

公开(公告)日：2006-09-28

申请号：US11090067

申请日：2005-03-28

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H03F1/14

CPC classification number: H03F3/1935 ,  H03F3/45381 ,  H03F2203/45361 ,  H03F2203/45368 ,  H03F2203/45638 ,  H03G1/0088 ,  H03G3/3042

Abstract: A transmitter includes a first variable gain amplifier (VGA) and a second VGA coupled to an output of the first VGA. The first and second VGAs each comprise a plurality of parallel gain stages. Gains of the first and second VGAs are equal to the sum of the gains of the activated parallel amplifiers within each corresponding plurality of parallel amplifiers. Each parallel amplifier comprises a parallel differential amplifier controlled by a pair of switches to activate and deactivate the parallel differential amplifier. The gains of the first and second VGAs are increased by activating additional parallel amplifiers. The gains of the first and second VGAs are decreased by deactivating additional parallel amplifiers. The variable gains of the first and second VGAs provide an extended gain control with improved local oscillator (LO) leakage interference rejection.

公开(公告)号：US20060094390A1

公开(公告)日：2006-05-04

申请号：US10976639

申请日：2004-10-29

Applicant: Meng-An Pan ,  Hooman Darabi

Inventor： Meng-An Pan ,  Hooman Darabi

IPC: H04B1/26 ,  H04B15/00

CPC classification number: H04B1/30

Abstract: In RF transceivers, a method and system for a dual mode receiver with low intermediate frequency (IF) and zero second IF are provided. An RF receivers may be adapted to operate in a low IF down conversion mode or a baseband down conversion mode. A control signal may be generated based on a local oscillator signal and may be utilized to configure a frequency mixer in accordance with the selected mode of operation. The frequency of the local oscillator may be based on the low IF value. When the low IF down conversion mode is selected, the frequency mixer operates in a pass through mode and the output may be transferred to a device with a low IF interface. When the baseband down conversion mode is selected, the output of the frequency mixer may be transferred to a baseband processor for further processing.

公开(公告)号：US20060094362A1

公开(公告)日：2006-05-04

申请号：US10977872

申请日：2004-10-29

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H04B15/00

CPC classification number: H04B15/06

Abstract: Methods and systems for reducing interference in a signal are disclosed herein. Aspects of the method may comprise generating a first local oscillator signal. The generated first local oscillator signal may be phase-shifted to generate a second local oscillator signal and the second local oscillator signal may be phase-shifted to generate a third local oscillator signal. The first, second, and third local oscillator signals may be combined to generate a combined local oscillator signal, where a third harmonic and/or a fifth harmonic may be eliminated from the combined local oscillator signal. The generated second local oscillator signal may be multiplied by a factor of square root of two (√{square root over (2)}). The first and third local oscillator signals may be added to the multiplied second local oscillator signal. An input signal may be mixed with the generated combined local oscillator signal to generate a mixed output signal.

Abstract translation: 本文公开了用于减少信号中的干扰的方法和系统。 该方法的方面可以包括产生第一本地振荡器信号。 产生的第一本地振荡器信号可以被相移以产生第二本地振荡器信号，并且第二本地振荡器信号可以被相移以产生第三本地振荡器信号。 第一，第二和第三本地振荡器信号可以被组合以产生组合的本地振荡器信号，其中可以从组合的本地振荡器信号中消除三次谐波和/或第五谐波。 所产生的第二本地振荡器信号可以乘以二（2）的平方根的因子，第一和第三本地振荡器信号可以被加到相乘的第二本机振荡器信号，输入信号可以是 与产生的组合本地振荡器信号混合以产生混合输出信号。

公开(公告)号：US20050240368A1

公开(公告)日：2005-10-27

申请号：US10800713

申请日：2004-03-16

Applicant: Meng-An Pan ,  Stephen Wu

Inventor： Meng-An Pan ,  Stephen Wu

IPC: H03H7/01 ,  G01R35/00

CPC classification number: H03H7/0153

Abstract: A calibration circuit and method causes a cutoff frequency to match the design frequency of low pass filter by adjusting a capacitor array in the low pass filter.

Abstract translation: 校准电路和方法通过调节低通滤波器中的电容阵列使截止频率与低通滤波器的设计频率相匹配。

公开(公告)号：US20050221788A1

公开(公告)日：2005-10-06

申请号：US10840271

申请日：2004-05-07

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: H03G3/30 ,  H03J3/06 ,  H04B1/12 ,  H04B1/16

CPC classification number: H04B1/123 ,  H03G3/3052 ,  H03G2201/706 ,  H03J3/06

Abstract: The invention enables a gain adjustment in a receiver to improve signal quality.

Abstract translation: 本发明使得接收机中的增益调整能够提高信号质量。

公开(公告)号：US20050181754A1

公开(公告)日：2005-08-18

申请号：US11107080

申请日：2005-04-15

Applicant: Stephen Wu ,  Hung-Ming Chien (Ed Chien) ,  Brima Ibrahim ,  Ahmadreza Rofougaran ,  Meng-An Pan

Inventor： Stephen Wu ,  Hung-Ming Chien (Ed Chien) ,  Brima Ibrahim ,  Ahmadreza Rofougaran ,  Meng-An Pan

IPC: H03H11/12 ,  H03H21/00 ,  A61M37/00 ,  H04B1/06

CPC classification number: H03H11/1291 ,  H03H21/0001 ,  H03H21/0012 ,  H03H2011/0494 ,  H03J2200/10

Abstract: An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged for integration into a single IC including components such as filters and inductors. The controller for adaptive programming and calibration of the receiver, transmitter and LO generator. The self-testing unit generates is used to determine the gain, frequency characteristics, selectivity, noise floor, and distortion behavior of the receiver, transmitter and LO generator. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Abstract translation: 在说明书和附图中描述和示出的本发明的示例性实施例是具有接收器，发射器，本地振荡器（LO）发生器，控制器和自检单元的收发器。 所有这些组件都可以封装以集成到单个IC中，其中包括过滤器和电感器等组件。 用于接收机，发射机和LO发生器的自适应编程和校准的控制器。 自检单元产生用于确定接收机，发射机和LO发生器的增益，频率特性，选择性，本底噪声和失真特性。 要强调的是，该摘要被提供以符合要求摘要的规则，这将允许搜索者或其他读者快速确定技术公开的主题。 提交它的理解是，它不会用于解释或限制权利要求的范围或含义。

公开(公告)号：US20050168268A1

公开(公告)日：2005-08-04

申请号：US10769900

申请日：2004-02-03

Applicant: Meng-An Pan

Inventor： Meng-An Pan

IPC: G05F1/10 ,  H04B1/04

CPC classification number: H04B1/04

Abstract: Embodiments of the invention enable generation of an IF output signal amplitude that is less sensitive to process voltage and temperature than conventional transmitters.

Abstract translation: 本发明的实施例能够产生对于过程电压和温度比常规发射机更不敏感的IF输出信号幅度。