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公开(公告)号：US06658237B1
公开(公告)日：2003-12-02
申请号：US09386865
申请日：1999-08-31
IPC分类号： H04B144
CPC分类号： H04B1/406 , H03D3/006 , H03D7/1408 , H03D7/1433 , H03D7/1441 , H03D7/1458 , H03D7/165 , H03D2200/009 , H04B1/30
摘要： A multi-band transceiver having a receiver portion and a transmitter portion, wherein the receiver portion includes a direct conversion receiver system for directly downconverting a signal to baseband frequencies. The direct conversion receiver system includes a frequency translator having first and second inputs and an output. A first signal at a first frequency is applied to the first input. A second signal having a second frequency is applied to the second input. The first frequency is preferably an nth order subharmonic of the second frequency, wherein n is an integer greater than 1. A low pass filter is integral with or inherent to the first input, and a high pass filter is integral with or inherent to the second input. The corner frequencies of both the low pass and high pass filters is above the first frequency and below the second frequency.
摘要翻译： 一种具有接收机部分和发射机部分的多频带收发机，其中所述接收机部分包括用于将信号直接下变频到基带频率的直接转换接收机系统。 直接转换接收机系统包括具有第一和第二输入和输出的频率转换器。 将第一频率的第一信号施加到第一输入端。 具有第二频率的第二信号被施加到第二输入端。 第一频率优选地是第二频率的第n次次谐波，其中n是大于1的整数。低通滤波器与第一输入一体或固有，并且高通滤波器与第二频率成一体或固有的 输入。 低通滤波器和高通滤波器的转角频率高于第一频率并低于第二频率。
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公开(公告)号：US06360087B1
公开(公告)日：2002-03-19
申请号：US09260919
申请日：1999-03-02
IPC分类号： H04B106
CPC分类号： H04B1/406 , H03D3/006 , H03D7/1408 , H03D7/1433 , H03D7/1458 , H03D7/1491 , H03D2200/0047 , H03D2200/009 , H04B1/30
摘要： A direct conversion receiver system is provided in which a first input signal at a first frequency is applied to a first input port of a multiplier, a second input signal at a second frequency equal to about {fraction (1/n)} times the first frequency, wherein n is an integer, is applied to a second input port of the multiplier. A first filter coupled to the first input port is configured to substantially filter out any leakage at the second frequency which may be present. A second filter coupled to the second input port is configured to substantially filter out any leakage at the first frequency which may be present. The multiplier is configured to produce a signal at an output port thereof which is derived from the product of the first and second signals. In one embodiment, the output is representative of the product of the filtered first signal and a multiplication factor which switches at n times the second frequency. The output of the multiplier is coupled to a third filter. The output signal has a baseband component and another component. The third filter is configured to substantially filter out the other component and substantially maintain the baseband component in the output signal. In one implementation example, the multiplier is a mixer initializing half-frequency injection, such that the LO frequency is about ½ the RF frequency.
摘要翻译： 提供一种直接转换接收机系统，其中以第一频率的第一输入信号被施加到乘法器的第一输入端口，第二频率的第二输入信号等于第一频率的大约{分数（1 / n）}倍） 频率，其中n是整数，被施加到乘法器的第二输入端口。 耦合到第一输入端口的第一滤波器被配置为基本上滤除可能存在的第二频率处的任何泄漏。 耦合到第二输入端口的第二滤波器被配置为基本上滤除可能存在的第一频率处的任何泄漏。 乘法器被配置为在其输出端口处产生从第一和第二信号的乘积导出的信号。 在一个实施例中，输出代表滤波后的第一信号和在第二频率n倍切换的乘法因子的乘积。 乘法器的输出耦合到第三个滤波器。 输出信号具有基带分量和另一分量。 第三滤波器被配置为基本上滤除另一分量并且基本上保持输出信号中的基带分量。 在一个实施例中，乘法器是混频器初始化半频率注入，使得LO频率约为RF频率的1/2。
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公开(公告)号：US06545554B1
公开(公告)日：2003-04-08
申请号：US09675239
申请日：2000-09-29
IPC分类号： H03B518
CPC分类号： H03B5/1231 , H03B5/1212 , H03B5/124
摘要： This invention relates to an oscillator that includes first and second switching elements that each have a control terminal, and first and second conduction terminals. The control terminal of the second switching element is coupled to the first conduction terminal of the first switching element, and the control terminal of the first switching element is coupled to the first conduction terminal of the second switching element. The oscillator also may include first and second capacitive elements, first and second inductive elements, and a resistive element. The first capacitive element may be coupled between the control terminal of the first switching element and a first reference node, and the second capacitive element may be coupled between the control terminal of the second switching element and the first reference node. The first inductive element may be coupled between the control terminal of the first switching element and a second reference node, and the second inductive element may be coupled between the control terminal of the second switching element and the second reference node. The resistive element may be coupled between the second conduction terminals of the switching elements and the first reference node. One or both of the first and second capacitive elements may have a variable capacitance.
摘要翻译： 本发明涉及一种包括第一和第二开关元件的振荡器，每个开关元件都具有控制端子，以及第一和第二导电端子。 第二开关元件的控制端子耦合到第一开关元件的第一导通端子，第一开关元件的控制端子耦合到第二开关元件的第一导通端子。 振荡器还可以包括第一和第二电容元件，第一和第二电感元件以及电阻元件。 第一电容元件可以耦合在第一开关元件的控制端子和第一参考节点之间，并且第二电容元件可以耦合在第二开关元件的控制端子和第一参考节点之间。 第一电感元件可以耦合在第一开关元件的控制端子和第二参考节点之间，并且第二电感元件可以耦合在第二开关元件的控制端子和第二参考节点之间。 电阻元件可以耦合在开关元件的第二导电端子和第一参考节点之间。 第一和第二电容元件中的一个或两个可以具有可变电容。
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公开(公告)号：US06249190B1
公开(公告)日：2001-06-19
申请号：US09386957
申请日：1999-08-25
IPC分类号： H03B512
CPC分类号： H03B5/1231 , H03B5/1203 , H03B5/1218 , H03B5/124 , H03B5/1296 , H03B2201/0208
摘要： A differential oscillator based on a first Colpitts oscillator and a mirror image Colpitts oscillator that is coupled to the first Colpitts oscillator. This differential oscillator outputs differential voltage signals that are about 180 degrees out of phase. The differential oscillator may also be adapted to form a voltage controlled oscillator (VCO) such that the differential voltage signals output by the VCO can be varied. A transceiver for telecommunication devices such as cellular phones may use differential oscillators to generate a carrier signal on which a voice or data signal is modulated and the same differential oscillators to assist isolation of the voice or data signal from received signals.
摘要翻译： 基于第一Colpitts振荡器和耦合到第一Colpitts振荡器的镜像Colpitts振荡器的差分振荡器。 该差分振荡器输出大约相差180度的差分电压信号。 差分振荡器还可以适于形成压控振荡器（VCO），使得由VCO输出的差分电压信号可以变化。 用于诸如蜂窝电话的电信设备的收发机可以使用差分振荡器来产生其上调制了语音或数据信号的载波信号，并且使用相同的差分振荡器来辅助语音或数据信号与接收到的信号的隔离。
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5.发明授权Apparatus for and method of improving efficiency of transceivers in radio products 失效无线电产品收发器效率提高的方法及方法公开(公告)号：US06405054B1
公开(公告)日：2002-06-11
申请号：US09672235
申请日：2000-09-27
IPC分类号： H04B700
CPC分类号： H03F3/24 , H03F1/0211 , H04B1/40
摘要： A system and method for minimizing power dissipation in a battery-operated mobile unit by adaptively controlling a voltage converter to provide a variable power supply voltage to a transmitter. In the preferred embodiment, the voltage converter is coupled to receive a source voltage from a battery, and is coupled to provide operating power to the transmitter or the power amplifier. The voltage converter is also coupled to receive a control signal from a controller, which adaptively activates the voltage converter to transform the source voltage to a converted voltage, or deactivates the voltage converter so as to directly apply the source voltage to the transmitter. Power dissipation is therefore minimized when conversion functions of the voltage converter are deactivated when voltage conversion is unnecessary.
摘要翻译： 一种用于通过自适应地控制电压转换器以向发射机提供可变电源电压来最小化电池供电的移动单元中的功率耗散的系统和方法。 在优选实施例中，电压转换器被耦合以从电池接收源电压，并被耦合以向发射器或功率放大器提供工作电力。 电压转换器还被耦合以从控制器接收控制信号，该控制信号自适应地激活电压转换器以将源电压转换成转换的电压，或者使电压转换器去激活，以便直接将源电压施加到发射器。 因此，当不需要电压转换时，电压转换器的转换功能被取消时，因此功耗最小化。
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6.发明授权Method and apparatus for improving the sensitivity of an RF receiver at certain frequencies 失效用于提高RF接收机在某些频率下的灵敏度的方法和装置公开(公告)号：US06192228B1
公开(公告)日：2001-02-20
申请号：US09153008
申请日：1998-09-11
IPC分类号： H04Q732
CPC分类号： H04B1/1027 , H04B15/04 , H04B2215/064 , H04B2215/065
摘要： A method and apparatus for improving the sensitivity of a radio frequency (RF) receiver at certain frequencies suffering from co-channel interference. In the preferred embodiment, when a reference frequency, FREF, generates significant harmonics for a received RF signal in a selected channel, the reference frequency is varied or offset by a small amount, &Dgr;F. The harmonics of the offset reference frequency, F′REF=FREF±&Dgr;F, are thereby shifted away from the frequency of the received RF signal, thus reducing co-channel interference. The offset amount &Dgr;F is chosen such that the same injection frequency synthesized from FREF can still be synthesized from FREF±&Dgr;F by shifting N by an integer amount, preferably to N+1 or N−1. However, the invention encompasses shifting N by other integer amounts.
摘要翻译： 一种在同频干扰的某些频率下改善射频（RF）接收机的灵敏度的方法和装置。 在优选实施例中，当参考频率FREF在所选择的信道中产生接收的RF信号的显着谐波时，参考频率被改变或偏移少量DELTAF。 因此，偏移参考频率F'REF = FREF±DELTAF的谐波从接收的RF信号的频率偏移，从而减少同信道干扰。 选择偏移量DELTAF，使得从FREF合成的相同注入频率仍然可以通过将N移位整数，优选为N + 1或N-1，从FREF±DELTAF合成。 然而，本发明包括将N移位其他整数。
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公开(公告)号：US6163706A
公开(公告)日：2000-12-19
申请号：US972311
申请日：1997-11-18
CPC分类号： H03F3/24 , H03F1/0211 , H04B1/40
摘要： A system and method for minimizing power dissipation in a battery-operated mobile unit by adaptively controlling a voltage converter to provide a variable power supply voltage to a transmitter. In the preferred embodiment, the voltage converter is coupled to receive a source voltage from a battery, and is coupled to provide operating power to the transmitter or the power amplifier. The voltage converter is also coupled to receive a control signal from a controller, which adaptively activates the voltage converter to transform the source voltage to a converted voltage, or deactivates the voltage converter so as to directly apply the source voltage to the transmitter. Power dissipation is therefore minimized when conversion functions of the voltage converter are deactivated when voltage conversion is unnecessary.
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公开(公告)号：US06529712B1
公开(公告)日：2003-03-04
申请号：US09383122
申请日：1999-08-25
IPC分类号： H04Q720
CPC分类号： H04W88/04 , H04W84/042
摘要： A system for amplifying a transmitted signal is provided. The system includes a receiver that receives the transmitted signal and generates a conducted signal from the transmitted signal. A non-linear oscillator, such as a synchronous oscillator that is operating in a borderline stable condition, is connected to the receiver. The non-linear oscillator receives the transmitted signal from the receiver and amplifies the transmitted signal without modifying the frequency of the transmitted signal, or its relative phase. The amplification by a non-linear oscillator causes the signal to be amplified relative to the noise, thus improving the signal-to-noise ratio.
摘要翻译： 提供一种放大发送信号的系统。 该系统包括接收发射信号并从所发射的信号产生传导信号的接收机。 非线性振荡器，例如在边界线稳定状态下工作的同步振荡器，被连接到接收器。 非线性振荡器接收来自接收机的发送信号，并放大发送信号，而不修改发送信号的频率或其相对相位。 非线性振荡器的放大使信号相对于噪声放大，从而提高了信噪比。
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公开(公告)号：US06466772B1
公开(公告)日：2002-10-15
申请号：US09161014
申请日：1998-09-25
IPC分类号： H04B104
CPC分类号： H03G3/3042 , H03F1/3241 , H03G3/004 , H03G3/3047
摘要： A closed loop power amplifier control system is provided. A self-adapting driver circuit is used to drive the power amplifier in accordance with the feed back error signal. The driver circuit compensates for non-linearities of the power amplifier.
摘要翻译： 提供闭环功率放大器控制系统。 自适应驱动电路用于根据反馈误差信号驱动功率放大器。 驱动电路补偿功率放大器的非线性。
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公开(公告)号：US6049724A
公开(公告)日：2000-04-11
申请号：US892444
申请日：1997-07-14
CPC分类号： H04B1/56 , H04B15/005
摘要： A DC voltage power supply for a time division multiple access (TDMA) radio system is provided. The DC voltage power supply apparatus includes an AC signal source, a switching transistor, a controlling signal source, a voltage converter circuit, and a capacitor. The AC signal source provides an AC signal to the DC voltage power supply. The switching transistor is coupled to the clock for switching on and off the clock signal. The controlling signal source is coupled to the switching transistor for turning the switching transistor off during a transmission or reception period and for turning the switching transistor on during an idle period. The voltage converter circuit is coupled to the switching transistor and generates a DC output voltage from the AC signal. Finally, the capacitor is coupled to the voltage converter such that the capacitor is charged by the DC output voltage when the switching transistor is turned on and the capacitor holds the DC output voltage by discharging when the switch is turned off.
摘要翻译： 提供了一种用于时分多址（TDMA）无线电系统的直流电压电源。 直流电压电源装置包括AC信号源，开关晶体管，控制信号源，电压转换器电路和电容器。 交流信号源向直流电压电源提供交流信号。 开关晶体管耦合到用于接通和关断时钟信号的时钟。 控制信号源耦合到开关晶体管，用于在发送或接收周期期间关断开关晶体管，并且在空闲周期期间使开关晶体管导通。 电压转换器电路耦合到开关晶体管，并从AC信号产生DC输出电压。 最后，电容器被耦合到电压转换器，使得当开关晶体管导通时电容器被DC输出电压充电，并且当开关断开时电容器通过放电来保持DC输出电压。
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