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公开(公告)号：US07035600B2
公开(公告)日：2006-04-25
申请号：US10464961
申请日：2003-06-19
CPC分类号： H03F1/3282 , H03F1/3241 , H04B1/0475
摘要： A circuit for use in a broadcast transmitter for adaptively compensating for carrier signal distortions caused by amplitude modulating an RF carrier signal. The circuit includes a modulator/amplifier network that receives an RF carrier signal and modulates it by a received amplitude varying signal to obtain therefrom a modulated carrier signal which may exhibit distortions caused by the amplitude modulating of the RF carrier signal. A digitally adaptive corrector precorrects the amplitude varying signal prior to application thereof to the network to compensate for any modulated carrier signal distortions. This includes a digital processor that provides signal correction as a function of digital samples representing amplitude variations of the modulated RF carrier signal.
摘要翻译： 一种用于广播发射机的电路，用于自适应地补偿由RF载波信号的幅度调制引起的载波信号失真。 该电路包括调制器/放大器网络，其接收RF载波信号并通过接收到的幅度变化信号进行调制，从而获得可能表现出由RF载波信号的幅度调制引起的失真的调制载波信号。 数字自适应校正器在施加到网络之前对幅度变化信号进行预校正，以补偿任何调制的载波信号失真。 这包括数字处理器，其提供作为表示调制的RF载波信号的幅度变化的数字样本的函数的信号校正。
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公开(公告)号：US06970051B2
公开(公告)日：2005-11-29
申请号：US10730146
申请日：2003-12-08
申请人： Ky Thoai Luu , Wayne Douglas Duello
发明人： Ky Thoai Luu , Wayne Douglas Duello
CPC分类号： H04L25/4902 , H03F1/0227 , H03F3/211 , H03K7/08
摘要： A pulse width modulator is presented herein and it includes a pulse width driver circuit that receives a time varying ramp signal that is modulated by a time varying analog input signal to produce a pulse width modulated drive signal comprised of turn-on pulses having widths that vary with variations in the magnitude of said input signal. A switch is turned on by each drive pulse for a time duration dependent upon the duration of each drive pulse and provides an output signal therefrom. A negative bias amplifier provides a negative bias signal that has pulsations that are synchronized with said drive pulses but of opposite phase. A combiner combines output signal with the negative bias signal to provide a combined output signal.
摘要翻译： 本文提出了一种脉冲宽度调制器，它包括一个脉冲宽度驱动器电路，其接收由时变模拟输入信号调制的时变斜坡信号，以产生脉冲宽度调制的驱动信号，该驱动信号包括具有变化宽度的导通脉冲 具有所述输入信号幅度的变化。 开关由每个驱动脉冲接通一段持续时间，取决于每个驱动脉冲的持续时间并提供一个输出信号。 负偏置放大器提供具有与所述驱动脉冲同步但具有相反相位的脉动的负偏置信号。 组合器将输出信号与负偏置信号组合以提供组合的输出信号。
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公开(公告)号：US06285255B1
公开(公告)日：2001-09-04
申请号：US09545319
申请日：2000-04-07
IPC分类号： H03F126
CPC分类号： H03C1/04 , H03F1/0222 , H03F1/3241 , H03F1/3247 , H04B2001/0425
摘要： Apparatus and method are presented for adaptively compensating for carrier signal phase distortion caused by amplitude modulating an RF carrier signal. A modulator-amplifier network receives an RF carrier signal and modulates it by a received amplitude varying signal to obtain therefrom a modulated RF carrier signal which is phase shifted from the phase of the carrier signal applied to the network by an amount that varies with the value of the amplitude varying signal. A phase shifter receives the RF carrier signal and phase shifts it in accordance with the value of a received phase correction signal to provide a pre-phase shifted carrier signal that is applied to the modulator-amplifier network. A phase detector receives and compares the modulated RF carrier signal and the carrier signal and provides an error signal in accordance with the comparison. An adaptive controller provides the correction signal and receives the error signal and the amplitude varying signal and varies the value of the correction signal in accordance with the value of the error signal and the value of the amplitude varying signal.
摘要翻译： 提出了用于自适应地补偿由RF载波信号的幅度调制引起的载波信号相位失真的装置和方法。 调制器 - 放大器网络接收RF载波信号并通过接收到的幅度变化信号进行调制，从而从施加到网络的载波信号的相位相移一个被调制的RF载波信号，该载波信号的值随着值的变化而变化 的振幅变化信号。 移相器接收RF载波信号，并根据接收到的相位校正信号的值进行相移，以提供施加到调制器 - 放大器网络的预相移载波信号。 相位检测器接收并比较经调制的RF载波信号和载波信号，并根据比较提供误差信号。 自适应控制器提供校正信号并接收误差信号和幅度变化信号，并根据误差信号的值和振幅变化信号的值改变校正信号的值。
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公开(公告)号：US08446992B2
公开(公告)日：2013-05-21
申请号：US12691814
申请日：2010-01-22
IPC分类号： H04L27/06
CPC分类号： H04L27/16 , H04L25/0226
摘要： A digital exciter is presented herein for use in RF broadcasting and wherein the exciter employs pilot signal compensation. This includes an input digital circuit for receiving a modulated digital data at an input sample rate for RF broadcasting at a desired RF frequency. The pilot frequency may be displaced from a desired location at the frequency band because of an error in the input sample rate. A digital compensator determines whether the pilot frequency is displaced and provides a digital correction signal in accordance therewith. A digital correction circuit corrects the pilot frequency in accordance with the correction signal.
摘要翻译： 此处提供了用于RF广播的数字激励器，并且其中激励器采用导频信号补偿。 这包括一个输入数字电路，用于以所需RF频率的RF广播的输入采样率接收调制数字数据。 由于输入采样率的误差，导频频率可能会从频段的期望位置偏离。 数字补偿器确定导频频率是否发生变化并提供数字校正信号。 数字校正电路根据校正信号校正导频。
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公开(公告)号：US20110182386A1
公开(公告)日：2011-07-28
申请号：US12691814
申请日：2010-01-22
IPC分类号： H04L27/06
CPC分类号： H04L27/16 , H04L25/0226
摘要： A digital exciter is presented herein for use in RF broadcasting and wherein the exciter employs pilot signal compensation. This includes an input digital circuit for receiving a modulated digital data at an input sample rate for RF broadcasting at a desired RF frequency. The pilot frequency may be displaced from a desired location at the frequency band because of an error in the input sample rate. A digital compensator determines whether the pilot frequency is displaced and provides a digital correction signal in accordance therewith. A digital correction circuit corrects the pilot frequency in accordance with the correction signal.
摘要翻译： 此处提供了用于RF广播的数字激励器，并且其中激励器采用导频信号补偿。 这包括一个输入数字电路，用于以所需RF频率的RF广播的输入采样率接收调制数字数据。 由于输入采样率的误差，导频频率可能会从频段的期望位置偏离。 数字补偿器确定导频频率是否发生变化并提供数字校正信号。 数字校正电路根据校正信号校正导频。
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公开(公告)号：US5732333A
公开(公告)日：1998-03-24
申请号：US601118
申请日：1996-02-14
申请人： Charles Brian Cox , David Kent Bonds , Jay Jui-Chieh Chen , Flaviu C. Costescu , Joel Richard Dierks , Wayne Douglas Duello , Thomas L. Frederick , Paul A. Goud , Derek Stephen Hilborn , Richard Johnathan Hinkle , Terry Lee Hinkle , David E. Jones , Theron Lee Jones , Patricia Fern Kavanagh , David W. Kroeger , Robert Richard Leyendecker , Vladimir Pavlovic , Claudio Gustavo Rey , Ray M.R. Sewlochan , Emre Tapucu , Mark A. Walker
发明人： Charles Brian Cox , David Kent Bonds , Jay Jui-Chieh Chen , Flaviu C. Costescu , Joel Richard Dierks , Wayne Douglas Duello , Thomas L. Frederick , Paul A. Goud , Derek Stephen Hilborn , Richard Johnathan Hinkle , Terry Lee Hinkle , David E. Jones , Theron Lee Jones , Patricia Fern Kavanagh , David W. Kroeger , Robert Richard Leyendecker , Vladimir Pavlovic , Claudio Gustavo Rey , Ray M.R. Sewlochan , Emre Tapucu , Mark A. Walker
CPC分类号： H03C3/406 , H03F1/3247 , H03F1/3294 , H03F2201/3233 , H04B2001/0425
摘要： A linear transmitter (101) using predistortion includes a modulator (103), a predistorter (107), a digital quadrature modulator (111), an upconverter (113), a power amplifier (115), and an antenna (117). In addition, the transmitter (101) has a feedback loop including a coupler (119), a downconverter (123), a digital quadrature demodulator (125), and a trainer (131). The digital data to be transmitted is provided into the modulator (103), which converts the digital data into in-phase and quadrature component signals. The in-phase and quadrature component signals are then provided to the predistorter (107), which "predistorts" the component signals prior to amplification. The digital quadrature modulator (111) converts the component signals into a single analog signal. The upconverter (113) upconverts this signal from the predistorter (107) into the desired frequency of transmission, which is provided to the power amplifier (115) and the antenna (117) for amplification and broadcast. The coupler (119) provides a portion of the amplified signal to the analog downconverter (123), which lowers the frequency of this signal to a range that is easily processed. The signal is then provided to the digital quadrature demodulator (125), which outputs the in-phase and quadrature component signals of the signal. These in-phase and quadrature component signals are provided to the trainer (131) which analyzes them with the output signals from the modulator. The trainer (131) compares these signals and updates the predistorter (107) so that the digital quadrature demodulator (125) output signals are substantially equivalent to the modulator (103) output signals.
摘要翻译： 使用预失真的线性发射机（101）包括调制器（103），预失真器（107），数字正交调制器（111），上变频器（113），功率放大器（115）和天线（117）。 另外，发射机（101）具有包括耦合器（119），下变频器（123），数字正交解调器（125）和训练器（131）的反馈回路。 要发送的数字数据被提供给调制器（103），其将数字数据转换成同相和正交分量信号。 然后将同相和正交分量信号提供给预失真器（107），其在放大之前“分段”分量信号。 数字正交调制器（111）将分量信号转换为单个模拟信号。 上变频器（113）将该信号从预失真器（107）上变频成期望的发送频率，其被提供给用于放大和广播的功率放大器（115）和天线（117）。 耦合器（119）将放大信号的一部分提供给模拟下变频器（123），这将该信号的频率降低到容易处理的范围。 然后将信号提供给数字正交解调器（125），其输出信号的同相和正交分量信号。 这些同相和正交分量信号被提供给训练器（131），其利用来自调制器的输出信号对它们进行分析。 训练器（131）比较这些信号并更新预失真器（107），使得数字正交解调器（125）输出信号基本上等于调制器（103）的输出信号。
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