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    • 52. 发明申请
    • PROTECTION CIRCUIT FOR POWER AMPLIFIER
    • 功率放大器保护电路
    • US20110043956A1
    • 2011-02-24
    • US12715250
    • 2010-03-01
    • Wenjun SuAristotele HadjichristosGurkanwal S. SahotaMarco Cassia
    • Wenjun SuAristotele HadjichristosGurkanwal S. SahotaMarco Cassia
    • H02H3/20
    • H03F1/52H03F3/24H03F2200/435H03F2200/78H03G3/3042H04B2001/0408
    • Techniques for protecting a power amplifier (PA) are described. In an exemplary design, an apparatus includes (i) a PA module to amplify an input RF signal and provide an output RF signal and (ii) a protection circuit to control a transmitter gain to protect the PA module against high peak voltage. In an exemplary design, the protection circuit includes a set of comparators to quantize an analog input signal and provide digital comparator output signals used to adjust the transmitter gain. In another exemplary design, the protection circuit reduces and increases the transmitter gain with hysteresis. In yet another exemplary design, the protection circuit has faster response to rising amplitude than falling amplitude of the output RF signal. The hysteresis and/or the different rise and fall responses may allow the protection circuit to avoid toggling the transmitter gain under severe load mismatch and to handle time-varying envelope due to amplitude modulation.
    • 描述了用于保护功率放大器(PA)的技术。 在示例性设计中,装置包括(i)PA模块,用于放大输入RF信号并提供输出RF信号,以及(ii)保护电路以控制发射机增益以保护PA模块免受高峰值电压。 在示例性设计中,保护电路包括一组比较器,用于量化模拟输入信号并提供用于调整发射机增益的数字比较器输出信号。 在另一示例性设计中,保护电路通过滞后减小并增加发射机增益。 在又一示例性设计中,保护电路比对输出RF信号的下降幅度具有对振幅上升的响应更快。 迟滞和/或不同的上升和下降响应可以允许保护电路避免在严重负载不匹配的情况下切换发射机增益,并且由于幅度调制来处理时变包络。
    • 53. 发明授权
    • Methods and apparatuses for selectable voltage supply
    • 用于可选电压供应的方法和装置
    • US07851947B2
    • 2010-12-14
    • US11935186
    • 2007-11-05
    • Marco CassiaAristotele HadjichristosConor DonovanSang-Oh Lee
    • Marco CassiaAristotele HadjichristosConor DonovanSang-Oh Lee
    • H02B1/24
    • H03K17/693Y10T307/696Y10T307/747
    • A circuit which selects a supply voltage from a plurality of voltage supplies is presented. The circuit includes a first transistor configured to select a first voltage supply, a second transistor configured to select a second voltage supply, a first parasitic current inhibitor coupled the first transistor, the first voltage supply, and the second voltage supply, where the first parasitic current inhibitor automatically utilizes the voltage supply providing the highest voltage for preventing a substrate current from flowing through a bulk node of the first transistor, and a second parasitic current inhibitor coupled the second transistor, the first voltage supply, and the second voltage supply, where the second parasitic current inhibitor automatically utilizes the voltage supply providing the highest voltage for preventing a substrate current from flowing through a bulk node of the second transistor.
    • 提出了从多个电压源中选择电源电压的电路。 该电路包括:第一晶体管,被配置为选择第一电压源;第二晶体管,被配置为选择第二电压源;耦合第一晶体管,第一电压源和第二电压源的第一寄生电流抑制器,其中第一寄生 电流抑制器自动地利用提供最高电压的电压源来防止衬底电流流过第一晶体管的体节点,以及耦合第二晶体管,第一电压源和第二电压源的第二寄生电流抑制器,其中 第二寄生电流抑制器自动利用提供最高电压的电压源来防止衬底电流流过第二晶体管的体节点。
    • 54. 发明申请
    • TUNABLE MATCHING CIRCUITS FOR POWER AMPLIFIERS
    • 功率放大器的可调匹配电路
    • US20100308933A1
    • 2010-12-09
    • US12544177
    • 2009-08-19
    • Puay Hoe SeeAristotele HadjichristosGurkanwal Singh Sahota
    • Puay Hoe SeeAristotele HadjichristosGurkanwal Singh Sahota
    • H03H7/38
    • H04B1/0458H03F1/565H03F3/24H03F3/72H03F2200/111H03F2200/378H03F2200/387H03F2203/7209
    • Tunable matching circuits for power amplifiers are described. In an exemplary design, an apparatus may include a power amplifier and a tunable matching circuit. The power amplifier may amplify an input RF signal and provide an amplified RF signal. The tunable matching circuit may provide output impedance matching for the power amplifier, may receive the amplified RF signal and provide an output RF signal, and may be tunable based on at least one parameter effecting the operation of the power amplifier. The parameter(s) may include an envelope signal for the amplified RF signal, an average output power level of the output RF signal, a power supply voltage for the power amplifier, IC process variations, etc. The tunable matching circuit may include a series variable capacitor and/or a shunt variable capacitor. Each variable capacitor may be tunable based on a control generated based on the parameter(s).
    • 描述了用于功率放大器的可调谐匹配电路。 在示例性设计中,设备可以包括功率放大器和可调谐匹配电路。 功率放大器可以放大输入RF信号并提供放大的RF信号。 可调谐匹配电路可以为功率放大器提供输出阻抗匹配,可以接收放大的RF信号并提供输出RF信号,并且可以基于影响功率放大器的操作的至少一个参数来调节。 参数可以包括放大的RF信号的包络信号,输出RF信号的平均输出功率电平,功率放大器的电源电压,IC过程变化等。可调谐匹配电路可以包括一系列 可变电容器和/或分流可变电容器。 每个可变电容器可以基于基于参数产生的控制来调节。
    • 57. 发明申请
    • METHODS AND APPARATUSES FOR SELECTABLE VOLTAGE SUPPLY
    • 用于选择电压供应的方法和装置
    • US20090115253A1
    • 2009-05-07
    • US11935186
    • 2007-11-05
    • Marco CassiaAristotele HadjichristosConor DonovanSang-Oh Lee
    • Marco CassiaAristotele HadjichristosConor DonovanSang-Oh Lee
    • H02J1/00
    • H03K17/693Y10T307/696Y10T307/747
    • A circuit which selects a supply voltage from a plurality of voltage supplies is presented. The circuit includes a first transistor configured to select a first voltage supply, a second transistor configured to select a second voltage supply, a first parasitic current inhibitor coupled the first transistor, the first voltage supply, and the second voltage supply, where the first parasitic current inhibitor automatically utilizes the voltage supply providing the highest voltage for preventing a substrate current from flowing through a bulk node of the first transistor, and a second parasitic current inhibitor coupled the second transistor, the first voltage supply, and the second voltage supply, where the second parasitic current inhibitor automatically utilizes the voltage supply providing the highest voltage for preventing a substrate current from flowing through a bulk node of the second transistor.
    • 提出了从多个电压源中选择电源电压的电路。 该电路包括:第一晶体管,被配置为选择第一电压源;第二晶体管,被配置为选择第二电压源;耦合第一晶体管,第一电压源和第二电压源的第一寄生电流抑制器,其中第一寄生 电流抑制器自动地利用提供最高电压的电压源来防止衬底电流流过第一晶体管的体节点,以及耦合第二晶体管,第一电压源和第二电压源的第二寄生电流抑制器,其中 第二寄生电流抑制器自动利用提供最高电压的电压源来防止衬底电流流过第二晶体管的体节点。
    • 58. 发明申请
    • DIVERSITY RECEIVER FOR WIRELESS COMMUNICATION
    • 多媒体接收器进行无线通信
    • US20070242784A1
    • 2007-10-18
    • US11548596
    • 2006-10-11
    • Wesley SampsonAristotele HadjichristosGurkanwal Sahota
    • Wesley SampsonAristotele HadjichristosGurkanwal Sahota
    • H04B7/08
    • H04B7/0822H04B1/006H04B7/0825H04B7/0831H04B7/0871H04W88/06
    • A diversity receiver capable of receiving a CDMA system (e.g., a W-CDMA system) and a TDMA system (e.g., a GSM system), with receive diversity for at least one system, is described. W-CDMA is often referred to as UMTS. In one design, the diversity receiver includes a first receiver for GSM and a second receiver for UMTS. The first receiver may be implemented with one receiver design, may be spec-compliant for GSM, and may also support UMTS. The second receiver may be implemented with another receiver design, may be spec-compliant for UMTS, and may also support GSM. The first receiver may include a lowpass filter having a bandwidth that is adjustable for GSM and UMTS. The second receiver may include a bandpass filter used to attenuate a transmit frequency range for UMTS. Each receiver may include circuit blocks that are used for both GSM and UMTS.
    • 描述了能够接收具有用于至少一个系统的接收分集的CDMA系统(例如,W-CDMA系统)和TDMA系统(例如,GSM系统)的分集接收机。 W-CDMA通常被称为UMTS。 在一种设计中,分集接收机包括用于GSM的第一接收机和用于UMTS的第二接收机。 第一接收机可以用一个接收机设计来实现,可以对GSM进行规范兼容,并且还可以支持UMTS。 第二接收机可以用另一个接收机设计来实现,可以对UMTS进行规范兼容,并且还可以支持GSM。 第一接收机可以包括具有可针对GSM和UMTS调整的带宽的低通滤波器。 第二接收机可以包括用于衰减UMTS的发射频率范围的带通滤波器。 每个接收机可以包括用于GSM和UMTS的电路块。
    • 59. 发明授权
    • Polar modulation using amplitude modulated quadrature signals
    • 使用幅度调制正交信号进行极坐标调制
    • US07023292B2
    • 2006-04-04
    • US10738268
    • 2003-12-17
    • David R. PehlkeAristotele Hadjichristos
    • David R. PehlkeAristotele Hadjichristos
    • H03C1/00H03C3/00H03C5/00
    • H04L27/362H04L27/361
    • Polar modulators include a phase splitter, a controller, variable current sources, transistor circuits, and a combiner. The phase splitter splits a RF carrier signal into quadrature component signals that are 90 degrees out of phase with each other. The controller generates modulation control signals based on information that is to be transmitted. The variable current sources each generate a variable amplitude current signal based on a different one of the modulation control signals. Each of the transistor circuits amplify a different one of the quadrature component signals with a variable amplification based on the variable amplitude current signal from a different one of the variable current sources to generate an amplitude adjusted quadrature component signal. The combiner combines the amplitude adjusted quadrature component signals from each of the transistor circuits to generate a phase-modulated RF carrier output signal.
    • 极性调制器包括分相器,控制器,可变电流源,晶体管电路和组合器。 相位分离器将RF载波信号分离成彼此相差90度的正交分量信号。 控制器根据要发送的信息产生调制控制信号。 可变电流源各自基于不同的调制控制信号产生可变幅度电流信号。 每个晶体管电路基于来自不同的可变电流源的可变幅度电流信号,用可变放大放大不同的正交分量信号,以产生振幅调整的正交分量信号。 组合器组合来自每个晶体管电路的幅度调整的正交分量信号以产生相位调制的RF载波输出信号。
    • 60. 发明申请
    • Polar modulation using amplitude modulated quadrature signals
    • 使用幅度调制正交信号进行极坐标调制
    • US20050134396A1
    • 2005-06-23
    • US10738268
    • 2003-12-17
    • David PehlkeAristotele Hadjichristos
    • David PehlkeAristotele Hadjichristos
    • H04L27/36H03C3/00
    • H04L27/362H04L27/361
    • Polar modulators include a phase splitter, a controller, variable current sources, transistor circuits, and a combiner. The phase splitter splits a RF carrier signal into quadrature component signals that are 90 degrees out of phase with each other. The controller generates modulation control signals based on information that is to be transmitted. The variable current sources each generate a variable amplitude current signal based on a different one of the modulation control signals. Each of the transistor circuits amplify a different one of the quadrature component signals with a variable amplification based on the variable amplitude current signal from a different one of the variable current sources to generate an amplitude adjusted quadrature component signal. The combiner combines the amplitude adjusted quadrature component signals from each of the transistor circuits to generate a phase-modulated RF carrier output signal.
    • 极性调制器包括分相器,控制器,可变电流源,晶体管电路和组合器。 相位分离器将RF载波信号分离成彼此相差90度的正交分量信号。 控制器根据要发送的信息产生调制控制信号。 可变电流源各自基于不同的调制控制信号产生可变幅度电流信号。 每个晶体管电路基于来自不同的可变电流源的可变幅度电流信号,用可变放大放大不同的正交分量信号,以产生振幅调整的正交分量信号。 组合器组合来自每个晶体管电路的幅度调整的正交分量信号以产生相位调制的RF载波输出信号。