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51.发明授权
公开(公告)号：EP0119561B1
公开(公告)日：1988-11-23
申请号：EP84102573.7
申请日：1984-03-09
发明人： Maier, Gerhard
CPC分类号： H03J3/32 , H03J7/065 , H03J2200/28
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52.发明公开Channel selection apparatus having automatic frequency compensation for transmission frequency error 失效KanalwahlgerätmitselbsttätigerKompensierung des Sendefrequenzfehlers。
公开(公告)号：EP0273389A2
公开(公告)日：1988-07-06
申请号：EP87119134.2
申请日：1987-12-23
发明人： Kubo, Kazuhiko , Usui, Akira , Miyata, Minoru , Ikuhara, Hideyuki , Nagai, Hiroyuki , Yamada, Tadashi
IPC分类号： H03J7/06
CPC分类号： H03J7/065
摘要： A channel selection apparatus having a double superhet tuner section (15) for converting one of a plurality of television channels contained in an input signal to a fixedly predetermined channel, includes an AFC circuit (11) for producing a frequency control voltage to execute closed-loop frequency control of the second local oscillator (5) of the tuner section while an AFC switch (16) is set in a first condition, whereas when the AFC switch is set in a second condition, a fixed frequency control voltage is applied to the second local oscillator and the frequency control voltage is applied to adust the oscillation frequency of the first local oscillator (2) of the tuner section such as to compensate for any offset in the transmission frequency of a currently selected channel.
摘要翻译： 具有用于将包含在输入信号中的多个电视频道中的一个转换为固定预定频道的双重监视调谐器部分（15）的频道选择装置包括用于产生频率控制电压的AFC电路（11） 当AFC开关（16）被设置在第一状态时，调谐器部分的第二本地振荡器（5）的环路频率控制，而当AFC开关被设置在第二状态时，固定的频率控制电压被施加到 第二本地振荡器和频率控制电压被施加到调谐器部分的第一本地振荡器（2）的振荡频率，以补偿当前选择的信道的传输频率中的任何偏移。
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公开(公告)号：EP0215490A2
公开(公告)日：1987-03-25
申请号：EP86112956.7
申请日：1986-09-19
发明人： Omoto, Noriaki
IPC分类号： H03J7/06
CPC分类号： H03J7/065
摘要： An A.F.C. control system for reception of wide-band F.M. transmission such as satellite transmissions, in which a center frequency of an F.M. I.F. signal is repetitively and alternately compared with an upper and a lower frequency limit value so long as the center frequency lies between these values, with the results of the comparisons being respectively stored in two latch memories (28, 29), whose contents thereby indicate any error of the center frequency relative to the frequency limits. Any departure of the center frequency from between the limits is corrected by successive frequency shifts of the local oscillator (4) frequency, with the results of correction being indicated by the latch memory contents and with the number of frequency shifts being determined accordingly.
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公开(公告)号：EP0076009B1
公开(公告)日：1984-11-14
申请号：EP82201196.1
申请日：1982-09-24
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公开(公告)号：EP0060845A4
公开(公告)日：1983-01-31
申请号：EP81902192
申请日：1981-07-29
申请人： MOTOROLA INC
CPC分类号： H03J7/023
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公开(公告)号：EP3514954B1
公开(公告)日：2021-06-30
申请号：EP18205779.4
申请日：2018-11-12
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公开(公告)号：EP3514954A1
公开(公告)日：2019-07-24
申请号：EP18205779.4
申请日：2018-11-12
申请人： MEDIATEK INC.
摘要： A wireless system includes a local oscillator (LO) signal generation circuit, a receiver (RX) circuit, and a calibration circuit. The LO signal generation circuit generates an LO signal according to a reference clock. The LO signal generation circuit includes an active oscillator. The active oscillator generates the reference clock, wherein the active oscillator includes at least one active component, and does not include an electromechanical resonator. The RX circuit generates a down-converted RX signal by performing down-conversion upon an RX input signal according to the LO signal. The calibration circuit generates a frequency calibration control output according to a signal characteristic of the down-converted RX signal, and outputs the frequency calibration control output to the LO signal generation circuit. The LO signal generation circuit adjusts an LO frequency of the LO signal in response to the frequency calibration control output.
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公开(公告)号：EP1751867B1
公开(公告)日：2018-07-04
申请号：EP05725604.2
申请日：2005-03-14
发明人： WILHITE, Jeffrey B., , CHARASKA, Joseph A., , GABATO, Manuel P., Jr. , GAILUS, Paul H., , STENGEL, Robert E.,
CPC分类号： H03L7/16 , H03K5/133 , H03K2005/00026 , H03K2005/00058 , H03L7/0812
摘要： A delay-locked loop 300 that includes: an adjustable frequency source ( 320 ) for generating a clock signal ( 322 ) having an adjustable frequency; an adjustment and tap selection controller ( 310 ) for determining a first frequency as a function of a second frequency and for causing the frequency source to adjust the frequency of the clock signal to substantially the first frequency, the second frequency being the desired frequency of a first output signal; a delay line ( 330 ) configured to receive the clock signal for generating a plurality of phase-shifted clock signals; and a first selection circuit ( 370 ) for receiving the plurality of phase-shifted clock signals and for selecting, one at a time and under the control of the adjustment and tap selection controller, a first sequence of the phase-shifted clock signals for generating the first output signal having substantially the second frequency.
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60.发明公开Clocking scheme for a wireless communication device 审中-公开Takterzeugungsschemafüreine drahtlose Kommunikationsvorrichtung
公开(公告)号：EP2408108A1
公开(公告)日：2012-01-18
申请号：EP10169482.6
申请日：2010-07-14
发明人： Isberg, Martin
IPC分类号： H03J7/06
CPC分类号： H04L7/0016 , H03J7/065
摘要： The invention relates to a method and a system for generating clock signals in a wireless communication device. The method includes generating an uncorrected reference clock signal, generating at least one frequency correction value corresponding to a frequency error in the uncorrected reference clock signal, and generating at least one radio frequency clock signal based on the uncorrected clock signal and the at least one frequency correction value, for receiving and transmitting radio frequency signals. The method further comprise generating, independently of the at least one radio frequency clock signal, a baseband timing signal based on the uncorrected reference clock signal and the at least one frequency correction value, for clocking baseband signal processing circuits.
摘要翻译： 本发明涉及一种用于在无线通信设备中产生时钟信号的方法和系统。 该方法包括产生未校正的参考时钟信号，产生对应于未校正的参考时钟信号中的频率误差的至少一个频率校正值，以及基于未校正的时钟信号和至少一个频率生成至少一个射频时钟信号 校正值，用于接收和发送射频信号。 所述方法还包括：基于所述未校正的参考时钟信号和所述至少一个频率校正值，独立于所述至少一个射频时钟信号产生基带定时信号，用于对基带信号处理电路进行计时。
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