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    • 1. 发明授权
    • Phase locked loop with two-step control
    • 具有两步控制的锁相环
    • US07724093B2
    • 2010-05-25
    • US12139291
    • 2008-06-13
    • Alexander WormerHarald Sandner
    • Alexander WormerHarald Sandner
    • H03L7/085H03L7/089H03L7/099
    • H03L7/113H03L7/087H03L7/089H03L7/093H03L7/0991H03L7/18H03L2207/50
    • A phase locked loop has a digitally controlled oscillator (DCO) for generating a DCO output signal (fOSC), a clock divider coupled to the DCO and receiving the DCO output signal and outputting a feedback clock signal (fN), and a phase frequency detector (PFD) coupled to the DCO and controlling the DCO by a DCO control signal (dCNTL). The PFD has a first input for receiving the feedback clock signal (fN), a second input for receiving a reference clock signal (fREF), and comprises a frequency detection stage (FD) adapted to calculate a frequency difference between the feedback clock signal (fN) and the reference clock signal (fREF) in a frequency detection mode and to adjust the DCO control signal based on said frequency difference, a phase detection (PD) stage for calculating a phase error between the feedback clock signal and the reference clock signal in a phase detection mode, and a switch for switching between the frequency detection mode and the phase detection mode upon the frequency of the feedback clock signal reaching a predetermined value.
    • 锁相环具有用于产生DCO输出信号(fOSC)的数字控制振荡器(DCO),耦合到DCO并接收DCO输出信号并输出​​反馈时钟信号(fN)的时钟分频器,以及相位频率检测器 (PFD)耦合到DCO并通过DCO控制信号(dCNTL)控制DCO。 PFD具有用于接收反馈时钟信号(fN)的第一输入端,用于接收基准时钟信号(fREF)的第二输入端,并且包括频率检测级(FD),该频率检测级适于计算反馈时钟信号 fN)和参考时钟信号(fREF),并且基于所述频率差调整DCO控制信号;相位检测(PD)级,用于计算反馈时钟信号和参考时钟信号之间的相位误差 在相位检测模式中,以及用于在反馈时钟信号的频率达到预定值时在频率检测模式和相位检测模式之间切换的开关。
    • 2. 发明申请
    • PHASE LOCKED LOOP WITH TWO-STEP CONTROL
    • 两相控制的锁相环
    • US20080309421A1
    • 2008-12-18
    • US12139291
    • 2008-06-13
    • Alexander WormerHarald Sandner
    • Alexander WormerHarald Sandner
    • H03L7/085
    • H03L7/113H03L7/087H03L7/089H03L7/093H03L7/0991H03L7/18H03L2207/50
    • A phase locked loop has a digitally controlled oscillator (DCO) for generating a DCO output signal (fOSC), a clock divider coupled to the DCO and receiving the DCO output signal and outputting a feedback clock signal (fN), and a phase frequency detector (PFD) coupled to the DCO and controlling the DCO by a DCO control signal (dCNTL). The PFD has a first input for receiving the feedback clock signal (fN), a second input for receiving a reference clock signal (fREF), and comprises a frequency detection stage (FD) adapted to calculate a frequency difference between the feedback clock signal (fN) and the reference clock signal (fREF) in a frequency detection mode and to adjust the DCO control signal based on said frequency difference, a phase detection (PD) stage for calculating a phase error between the feedback clock signal and the reference clock signal in a phase detection mode, and a switch for switching between the frequency detection mode and the phase detection mode upon the frequency of the feedback clock signal reaching a predetermined value.
    • 锁相环具有用于产生DCO输出信号(fOSC)的数字控制振荡器(DCO),耦合到DCO并接收DCO输出信号并输出​​反馈时钟信号(fN)的时钟分频器,以及相位频率检测器 (PFD)耦合到DCO并通过DCO控制信号(dCNTL)控制DCO。 PFD具有用于接收反馈时钟信号(fN)的第一输入端,用于接收基准时钟信号(fREF)的第二输入端,并且包括频率检测级(FD),该频率检测级适于计算反馈时钟信号 fN)和参考时钟信号(fREF),并且基于所述频率差调整DCO控制信号;相位检测(PD)级,用于计算反馈时钟信号和参考时钟信号之间的相位误差 在相位检测模式中,以及用于在反馈时钟信号的频率达到预定值时在频率检测模式和相位检测模式之间切换的开关。
    • 3. 发明授权
    • Heterodyne receiver
    • 外差接收机
    • US07962112B2
    • 2011-06-14
    • US11954136
    • 2007-12-11
    • Harald SandnerAjaib Hussain
    • Harald SandnerAjaib Hussain
    • H04B1/06H04K3/00
    • H03G3/3078H03G3/3068
    • A heterodyne receiver comprising a gain controllable RF mixer (14) which has a first input connected to a first local oscillator (16) and a second input connected to an RF input. The receiver comprises a peak detector (38) which detects a peak value of an input signal at the second input of the HF mixer and generates a digital control signal if it is determined that the peak value of the input signal is above a predetermined level. A digital automatic gain control circuit (34) decreases upon reception of the digital control signal the gain of the RF mixer.
    • 一种外差接收器,包括增益可控RF混频器(14),其具有连接到第一本地振荡器(16)的第一输入端和连接到RF输入端的第二输入端。 接收机包括峰值检测器(38),其在HF混频器的第二输入端检测输入信号的峰值,并且如果确定输入信号的峰值高于预定电平则产生数字控制信号。 数字自动增益控制电路(34)在接收到数字控制信号时降低RF混频器的增益。
    • 4. 发明申请
    • HETERODYNE RECEIVER
    • 异位接收器
    • US20080153445A1
    • 2008-06-26
    • US11954136
    • 2007-12-11
    • Harald SandnerAjaib Hussain
    • Harald SandnerAjaib Hussain
    • H04B1/06
    • H03G3/3078H03G3/3068
    • A heterodyne receiver comprising a gain controllable RF mixer (14) which has a first input connected to a first local oscillator (16) and a second input connected to an RF input. The receiver comprises a peak detector (38) which detects a peak value of an input signal at the second input of the HF mixer and generates a digital control signal if it is determined that the peak value of the input signal is above a predetermined level. A digital automatic gain control circuit (34) decreases upon reception of the digital control signal the gain of the RF mixer.
    • 一种外差接收器,包括增益可控RF混频器(14),其具有连接到第一本地振荡器(16)的第一输入端和连接到RF输入端的第二输入端。 接收机包括峰值检测器(38),其在HF混频器的第二输入端检测输入信号的峰值,并且如果确定输入信号的峰值高于预定电平则产生数字控制信号。 数字自动增益控制电路(34)在接收到数字控制信号时降低RF混频器的增益。
    • 8. 发明申请
    • Digital audio broadcast receiver
    • 数字音频广播接收机
    • US20080152049A1
    • 2008-06-26
    • US11953674
    • 2007-12-10
    • Harald SandnerAjaib Hussain
    • Harald SandnerAjaib Hussain
    • H04L27/06
    • H04L27/0014H04H40/18H04H2201/20
    • A digital audio broadcast (DAB) receiver (10) for receiving an RF signal comprises a low noise amplifier (16), an RF mixer (24) that generates an intermediate frequency signal, and a voltage controlled oscillator (23). The receiver includes a tracking filter (18) downstream of the low noise amplifier (16) and upstream of the RF mixer (24), wherein the tracking filter is tuned to track a selected channel frequency out of the received RF signal. In a described embodiment, the tracking filter includes a bandpass filter (20) and a notch filter (22). A center frequency of the bandpass filter is tuned to track the selected channel frequency; and an attenuation notch of the notch filter is tuned to track a frequency which is separated from the selected channel frequency by a fixed frequency; the attenuation notch of the notch filter is tuned together with the center frequency of the bandpass filter, and the center frequencies of the notch filter and the bandpass filter are separated by a fixed frequency. The tracking filter is tuned by a digital word developed by a digital signal processor responsive to the intermediate frequency signal.
    • 用于接收RF信号的数字音频广播(DAB)接收机(10)包括低噪声放大器(16),产生中频信号的RF混频器(24)和压控振荡器(23)。 接收器包括在低噪声放大器(16)下游和RF混频器(24)的上游的跟踪滤波器(18),其中跟踪滤波器被调谐以跟踪所接收的RF信号中所选择的信道频率。 在所描述的实施例中,跟踪滤波器包括带通滤波器(20)和陷波滤波器(22)。 调整带通滤波器的中心频率以跟踪所选择的信道频率; 并且陷波滤波器的衰减陷波被调谐以跟踪与所选频道频率分离固定频率的频率; 陷波滤波器的衰减陷波与带通滤波器的中心频率一起调谐,陷波滤波器和带通滤波器的中心频率以固定频率分开。 跟踪滤波器由响应于中频信号的数字信号处理器开发的数字字来调谐。