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1. 发明授权

US08035446B1 Natural sampling for a digital Class-D power amplifier 有权
标题翻译：数字D类功率放大器的自然采样
公开(公告)号：US08035446B1
公开(公告)日：2011-10-11
申请号：US11109372
申请日：2005-04-19
申请人： Zhipei Chi , Peiqi Xuan , Runsheng He
发明人： Zhipei Chi , Peiqi Xuan , Runsheng He
IPC分类号： H03F1/26 , H03F1/30
CPC分类号： H03F3/2173
摘要： A digital signal processor includes an up-sampling module that samples an input signal and generates up-sampling points. A natural sampling module includes a reference signal generation module that generates a reference signal. A crossing point detection module receives the up-sampling points and the reference signal and uses interpolation to detect intersection points of the input signal and the reference signal. The crossing point detection module determines values of the input signal at first and second evaluation times. The crossing point detection module estimates a current intersection point of the input signal and the reference signal as an intersection of the reference signal and a line that extends between first and second points on the input signal that correspond with the first and second evaluation times. A frequency of the reference signal is variable and a current switching period of the reference signal is not equal to a previous switching period.
摘要翻译：数字信号处理器包括上采样模块，其对输入信号进行采样并产生上采样点。自然采样模块包括产生参考信号的参考信号产生模块。交叉点检测模块接收上采样点和参考信号，并使用内插来检测输入信号和参考信号的交点。交叉点检测模块在第一和第二评估时间确定输入信号的值。交叉点检测模块将输入信号和参考信号的当前交点作为参考信号与在与第一和第二评估时间对应的输入信号上的第一和第二点之间延伸的线的交点进行估计。参考信号的频率是可变的，并且参考信号的电流切换周期不等于先前的切换周期。

2. 发明授权

US08238844B2 Radio transmitter and radio receiver with channel condition assessment 有权
标题翻译：无线电发射机和无线电接收机，具有信道状况评估
公开(公告)号：US08238844B2
公开(公告)日：2012-08-07
申请号：US12473281
申请日：2009-05-28
申请人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
发明人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
IPC分类号： H03C1/62 , H04B17/00 , H04B1/18 , H04W4/00
CPC分类号： H04B1/034 , H03J1/0091
摘要： FM radio transmitter is being widely used in portable devices as a convenient way to output audio contents to ubiquitously available FM radio receivers in cars or homes. However, the signal from the FM radio transmitter may be interfering with the signal being broadcast by an FM radio station. A scan system is incorporated into the FM radio transmitter to quickly and reliably identify a vacant channel for the FM radio transmitter to use. The scan system measures on-channel and out-of-channel signal quality and selects a best channel for transmission based on the measured on-channel and out-of-channel signal quality. The scan system is also incorporated into an FM radio receiver to quickly and reliably tune to a valid channel. The scan system selects the valid channel based on the measured on-channel and out-of-channel signal quality.
摘要翻译： FM无线电发射机正在便携式设备中广泛使用，以便将音频内容输出到汽车或家庭中普遍可用的FM无线电接收机。然而，来自FM无线电发射机的信号可能干扰由FM无线电台广播的信号。扫描系统被并入FM无线电发射机，以快速可靠地识别用于FM无线电发射机使用的空闲信道。扫描系统测量通道和通道外信号质量，并根据测量的通道和通道外信号质量选择最佳传输通道。扫描系统也被并入到FM无线电接收机中以快速可靠地调谐到有效信道。扫描系统基于所测量的在线信道和信道外信号质量来选择有效信道。

3. 发明授权

US08212602B2 System and method for signal mixing based on high order harmonics 有权
标题翻译：基于高次谐波信号混合的系统和方法
公开(公告)号：US08212602B2
公开(公告)日：2012-07-03
申请号：US12873323
申请日：2010-09-01
申请人： Hao Meng , Peiqi Xuan
发明人： Hao Meng , Peiqi Xuan
IPC分类号： G06G7/12
CPC分类号： G06F1/06 , H03K23/50
摘要： A system and method for signal mixing using high-order harmonics of a local oscillation (LO) signal. In a radio frequency (RF) system, the input RF signal is converted to a lower frequency signal such as an intermediate frequency (IF) signal or a baseband signal for further processing. A voltage controlled oscillator (VCO) is often used to generate a VCO signal which is then divided down to provide the needed LO signals for down conversion. The present invention discloses a system and method for generating a composite harmonic signal based on a linear combination of divided down LO signals with specific phase shifts. Consequently a VCO signal with lower frequency can be used to conserve power. The composite harmonic signal is mixed with the input RF signal to generate a series of mixed signal including one associated with a high-order harmonic of the divided down LO signal. Systems to implement the high order harmonic mixing is also disclosed which comprises a plurality of mixer sections with configurable weighting factors. A combination circuit is used to combine the weighted mixed signals which contains a term corresponding the mixing of the input RF signal with a high order LO harmonic.
摘要翻译：一种使用本地振荡（LO）信号的高次谐波进行信号混合的系统和方法。在射频（RF）系统中，输入RF信号被转换为诸如中频（IF）信号或基带信号的较低频率信号，用于进一步处理。压控振荡器（VCO）通常用于产生VCO信号，然后将其分频以提供所需的LO信号用于下变频。本发明公开了一种基于具有特定相移的分频LO信号的线性组合来生成复合谐波信号的系统和方法。因此，可以使用具有较低频率的VCO信号来节省功率。复合谐波信号与输入RF信号混合，以产生一系列混合信号，包括与分频LO信号的高次谐波相关的混合信号。还公开了实现高阶谐波混合的系统，其包括具有可配置加权因子的多个混频器部分。组合电路用于组合加权混合信号，该混合信号包含对应于输入RF信号的混合的项与高阶LO谐波。

4. 发明申请

US20120026407A1 System and Method for Configurable Multi-standard Receiver 审中-公开
标题翻译：可配置多标准接收机的系统和方法
公开(公告)号：US20120026407A1
公开(公告)日：2012-02-02
申请号：US13116532
申请日：2011-05-26
申请人： Yifeng Zhang , Rong Liu , Peiqi Xuan , Xiaodong Jin
发明人： Yifeng Zhang , Rong Liu , Peiqi Xuan , Xiaodong Jin
IPC分类号： H04N5/50 , H04B1/16 , H04B1/06
CPC分类号： H04B1/30 , H04B1/0032 , H04B1/406 , H04N5/46 , H04N21/42638
摘要： A configurable multi-standard receiver. A receiver comprises a mixer, a processing module and an analog to digital converter is disclosed to receive multi-standard radio signals. The processing module includes a first selection switch and first parameter control, where the first selection switch configures the processing module as a complex filter or a real-valued filter and the first parameter control configures the characteristics of the filter. Furthermore, the analog to digital converted is preferably implemented using sigma delta modulation to achieve a desired noise shaping. The sigma delta modulation comprises a second selection switch and second parameter control. The second selection switch configures the sigma delta modulation to function as a unit having a complex loop filter or a unit having real-valued loop filters. The second parameter control configures the characteristics of the loop filter. The settings for the first and second selection switches and the first and second control parameters may be stored in a control register.
摘要翻译：可配置的多标准接收器。接收机包括混频器，处理模块和模数转换器，用于接收多标准无线电信号。处理模块包括第一选择开关和第一参数控制，其中第一选择开关将处理模块配置为复数滤波器或实值滤波器，并且第一参数控制器配置滤波器的特性。此外，优选地，使用Σ-Δ调制来实现模数转换，以实现期望的噪声整形。 Σ-Δ调制包括第二选择开关和第二参数控制。第二选择开关将Σ-Δ调制配置为具有复环路滤波器或具有实值环路滤波器的单元的单元。第二个参数控制配置环路滤波器的特性。第一和第二选择开关以及第一和第二控制参数的设置可以存储在控制寄存器中。

5. 发明申请

US20120007638A1 SYSTEM AND METHOD FOR MULTIPLE-PHASE CLOCK GENERATION 有权
标题翻译：多相时钟生成系统与方法
公开(公告)号：US20120007638A1
公开(公告)日：2012-01-12
申请号：US12872371
申请日：2010-08-31
申请人： Hao Meng , Peiqi Xuan
发明人： Hao Meng , Peiqi Xuan
IPC分类号： H03K23/00
CPC分类号： G06F1/06 , H03K23/50
摘要： A system and method of clock generation to provide divided-by-2 clocks with prescribed phase shifts are disclosed. In a communication system with high-order harmonic mixing, the system requires LO signals with a set of prescribed phase shifts, such as 0°, 45°, 90°, and 135°, or 0°, 60° and 120°. Often, the clock generation system involves a divide-by-2 divider to derive the clock signals with the prescribed phase shifts. In a conventional implementation of the divide-by-2 divider, the system is subject to phase uncertainty in the output signal. Accordingly, a system comprises multiple latch pairs and respective differential clocks are used to generate the clocks with the set of correct prescribed phase shifts.
摘要翻译：公开了一种提供具有规定相移的二分之一秒钟的时钟产生系统和方法。在具有高次谐波混合的通信系统中，系统需要具有一定规定相移的LO信号，例如0°，45°，90°和135°，或0°，60°和120°。通常，时钟发生系统涉及一个除以2的分频器，以规定的相移导出时钟信号。在2分频器的传统实现中，系统在输出信号中受到相位不确定性的影响。因此，系统包括多个锁存器对，并且使用相应的差分时钟来产生具有正确规定相移集合的时钟。

6. 发明授权

US08422409B2 System and method of duplex wireless audio link over broadcast channels 失效
标题翻译：通过广播频道的双工无线音频链路的系统和方法
公开(公告)号：US08422409B2
公开(公告)日：2013-04-16
申请号：US12895143
申请日：2010-09-30
申请人： Hangwei Guo , Yifeng Zhang , Peiqi Xuan
发明人： Hangwei Guo , Yifeng Zhang , Peiqi Xuan
IPC分类号： H04B7/005 , H04B1/44 , H04W4/00 , H04J3/02
CPC分类号： H04B1/40 , H04B1/034
摘要： A device and method of duplex audio communication over a broadcast channel are disclosed. Low-power transmission over a broadcast channel is permissible for personal use as long as the transmitted power level is below a level allowed by respective regulatory. For example, low-power FM transmitter can be used to provide a wireless audio link between two audio devices. One such application scenario is a wireless speakerphone used as an audio extension from a cellphone for group conference purposes. Such applications face issues of potential interference from other users of the same channel and the need of manually selecting and tuning a pair of channels. The device and method disclosed in the present invention use the clear channel technique to automatically select an un-occupied channel for the transmit side and utilizes an identification embedded in a sub-channel to allow the receiver to automatically tune to the channel used by the transmitter. The clear channels may be determined by respective transceivers or determined by a master transceiver.
摘要翻译：公开了一种通过广播信道进行双工音频通信的设备和方法。只要发射功率水平低于相关监管机构允许的水平，就可以在广播频道上进行低功率传输。例如，低功率FM发射机可用于在两个音频设备之间提供无线音频链路。一种这样的应用场景是用作用于组会议目的的手机的音频扩展的无线扬声器。这样的应用程序面临来自相同信道的其他用户的潜在干扰的问题以及手动选择和调谐一对信道的需要。在本发明中公开的设备和方法使用清晰的信道技术来自动选择用于发射侧的未占用信道，并利用嵌入在子信道中的标识来允许接收机自动调谐到由发射机使用的信道。清除信道可以由相应的收发器确定或由主收发器确定。

7. 发明授权

US08237485B2 System and method for multiple-phase clock generation 有权
标题翻译：用于多相时钟生成的系统和方法
公开(公告)号：US08237485B2
公开(公告)日：2012-08-07
申请号：US12872371
申请日：2010-08-31
申请人： Hao Meng , Peiqi Xuan
发明人： Hao Meng , Peiqi Xuan
IPC分类号： G06F1/04
CPC分类号： G06F1/06 , H03K23/50
摘要： A system and method of clock generation to provide divided-by-2 clocks with prescribed phase shifts are disclosed. In a communication system with high-order harmonic mixing, the system requires LO signals with a set of prescribed phase shifts, such as 0°, 45°, 90°, and 135°, or 0°, 60° and 120°. Often, the clock generation system involves a divide-by-2 divider to derive the clock signals with the prescribed phase shifts. In a conventional implementation of the divide-by-2 divider, the system is subject to phase uncertainty in the output signal. Accordingly, a system comprises multiple latch pairs and respective differential clocks are used to generate the clocks with the set of correct prescribed phase shifts.
摘要翻译：公开了一种提供具有规定相移的二分之一秒钟的时钟产生系统和方法。在具有高次谐波混合的通信系统中，系统需要具有一定规定相移的LO信号，例如0°，45°，90°和135°，或0°，60°和120°。通常，时钟发生系统涉及一个除以2的分频器，以规定的相移导出时钟信号。在2分频器的传统实现中，系统在输出信号中受到相位不确定性的影响。因此，系统包括多个锁存器对，并且使用相应的差分时钟来产生具有正确规定相移集合的时钟。

8. 发明授权

US08213890B2 System and method for tuning-capacitor-array sharing 有权
标题翻译：调谐电容阵列共享的系统和方法
公开(公告)号：US08213890B2
公开(公告)日：2012-07-03
申请号：US12822182
申请日：2010-06-24
申请人： Hao Meng , Peiqi Xuan
发明人： Hao Meng , Peiqi Xuan
IPC分类号： H04B1/18
CPC分类号： H03J5/244 , H03J2200/10
摘要： A system and method for sharing a switched capacitor array (SCA) by two tuning circuits are disclosed. In a multiple-band radio receiver, there is a need to use multiple tuning circuits for signals in different bands. The tuning circuit typically comprised an adjustable capacitance device and other tuning components, where the adjustable capacitance device is often implemented in SCA. The present invention discloses a system and method comprising n sections of capacitor elements where each capacitor element comprises a capacitor and switches to selectively connect the capacitor to one of the tuning circuit. Consequently, the SCA can be shared by the two tuning circuits. The control bits for the switched may be provided from a programmable control register.
摘要翻译：公开了一种通过两个调谐电路共享开关电容阵列（SCA）的系统和方法。在多频带无线电接收机中，需要对不同频段的信号使用多个调谐电路。调谐电路通常包括可调电容器件和其他调谐组件，其中可调电容器件通常在SCA中实现。本发明公开了一种包括电容器元件的n个部分的系统和方法，其中每个电容器元件包括一个电容器，并且开关将该电容器选择性地连接到一个调谐电路。因此，SCA可以由两个调谐电路共享。可以从可编程控制寄存器提供用于切换的控制位。

9. 发明申请

US20120025921A1 Low Noise VCO Circuit Having Low Noise Bias 审中-公开
标题翻译：具有低噪声偏置的低噪声VCO电路
公开(公告)号：US20120025921A1
公开(公告)日：2012-02-02
申请号：US12893280
申请日：2010-09-29
申请人： Yu Yang , Xuechu Li , Peiqi Xuan
发明人： Yu Yang , Xuechu Li , Peiqi Xuan
IPC分类号： H03B5/12
CPC分类号： H03B5/1228 , H03B5/1212 , H03B5/1243 , H03B2200/0062
摘要： A low noise VCO circuit for an LC VCO circuit comprising MOS varactors is disclosed. The LC VCO circuit usually comprises an LC tuning circuit coupled with a pair of cross-coupled transistors used as a negative impedance element. A pair of varactors is used to provide fine tuning by applying a control voltage to the varactor. Since the varactor is also coupled to the pair of cross-coupled transistor, the process variation and temperature change may affect the bias voltage coupled to the pair of varactors. Therefore, a bias circuit usually is used to alleviate the impact of process variation and temperature change associated with the pair of transistor. Nevertheless, the bias voltage typically is implemented by providing a current flowing through a resistor, wherein the current is generated by a current source. The noise associated with the current source will affect the performance of the VCO circuit. A low noise VCO circuit is disclosed which utilizes a low noise bias circuit. The low noise bias circuit comprises a current source, a load device and a voltage divider wherein the load device is coupled to the voltage divider in parallel. The load device may be implemented using a bipolar transistor or a diode-connected MOS device.
摘要翻译：公开了一种用于包括MOS可变电抗器的LC VCO电路的低噪声VCO电路。 LC VCO电路通常包括与用作负阻抗元件的一对交叉耦合晶体管耦合的LC调谐电路。一对变容二极管用于通过对变容二极管施加控制电压来提供微调。由于变容二极管还耦合到一对交叉耦合晶体管，所以工艺变化和温度变化可能影响耦合到该对变容二极管的偏置电压。因此，偏置电路通常用于减轻与该对晶体管相关的工艺变化和温度变化的影响。然而，偏置电压通常通过提供流过电阻器的电流来实现，其中电流由电流源产生。与电流源相关的噪声将影响VCO电路的性能。公开了一种利用低噪声偏置电路的低噪声VCO电路。低噪声偏置电路包括电流源，负载装置和分压器，其中负载装置并联耦合到分压器。负载装置可以使用双极晶体管或二极管连接的MOS器件来实现。

10. 发明授权

US08478218B2 Frequency modulation (FM) clear channel scanning system and method of using same 失效
标题翻译：频率调制（FM）清除通道扫描系统及其使用方法
公开(公告)号：US08478218B2
公开(公告)日：2013-07-02
申请号：US12137535
申请日：2008-06-11
申请人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
发明人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
IPC分类号： H04B1/18 , H04B7/00 , H04W4/00 , H04W72/00
CPC分类号： H03J1/0091
摘要： A scan system receives signals within a band from an antenna and divides the band into sub-bands and scans the channels of each sub-band to determine a candidate channel based on the lowest figure of merit (FOM) and includes an on-channel selection block responsive to a received digital signal and operative to select only the on-channel frequencies and to substantially disregard the out-of-channel frequencies from the digital signal. The scan system generates a FOM on-channel signal representing a measurement of the signal quality of the on-channel signal and includes an out-of-channel selection block responsive to the digital signal and operative to select only the out-of-channel frequencies and to substantially disregard the on-channel frequencies from the digital signal and operative to generate a FOM out-of-channel signal representing a measurement of the signal quality of the out-of-channel signal.
摘要翻译：扫描系统从天线接收频带内的信号，并将频带划分为子带，并扫描每个子带的信道，以便根据最低品质因数（FOM）确定候选信道，并包括一个通道内选择响应于接收到的数字信号并且仅操作以仅选择在频道上的频率并且基本上忽略来自数字信号的信道外频率。扫描系统产生表示通道信号的信号质量的测量的FOM通道信号，并且包括响应于数字信号的通道外选择块，并且仅操作以仅选择通道外频率并且基本上忽略来自数字信号的通道频率，并且可操作地产生表示信道外信号的信号质量测量的FOM信道外信号。

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