公开(公告)号：WO1995030275A1

公开(公告)日：1995-11-09

申请号：PCT/US1995005257

申请日：1995-04-28

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  WILSON, Nathaniel, B. ,  BLACK, Peter, J. ,  PETERZELL, Paul, E.

IPC: H03G03/30

CPC classification number: H03D7/165 ,  H03D3/002 ,  H03D3/008 ,  H03D2200/0025 ,  H03D2200/0047 ,  H03D2200/005 ,  H03D2200/0052 ,  H03G3/3052 ,  H03G3/3089

Abstract: An automatic gain control (AGC) and D.C. offset correction method and apparatus for controlling signal power of a received RF signal within a dual mode quadrature receiver is disclosed herein. The AGC apparatus includes an adjustable gain amplifier (18). A quadrature downconverter (20) coupled to the amplifier (18) serves to translate the frequency of the output signal to a baseband frequency which is offset by a predetermined margin from D.C. Two high gain active lowpass filters (76 and 78) provide out-of-band signal rejection for the baseband signals. A D.C. feedthrough suppression loop supresses D.C. offsets produced by a downconverter (20) and the lowpass filters (76 and 78). The AGC apparatus also generates a received power signal based on the power of the output signal. A saturating integrator compares the received power signal to a reference signal and produces the gain control signal by integrating or by refraining from integration based on values of the reference, received power signal, and gain control signals.

Abstract translation: 本文公开了一种用于控制双模正交接收机内的接收RF信号的信号功率的自动增益控制（AGC）和直流偏移校正方法和装置。 AGC装置包括可调增益放大器（18）。 耦合到放大器（18）的正交下变频器（20）用于将输出信号的频率转换为从DC偏移预定裕度的基带频率。两个高增益有源低通滤波器（76和78）提供外部 基带信号的带内信号抑制。 D.C.馈通抑制环路抑制由下变频器（20）和低通滤波器（76和78）产生的直流偏移。 AGC装置还基于输出信号的功率产生接收功率信号。 饱和积分器将接收到的功率信号与参考信号进行比较，并通过积分或通过基于参考值，接收功率信号和增益控制信号的值的积分来产生增益控制信号。

公开(公告)号：WO1995023460A1

公开(公告)日：1995-08-31

申请号：PCT/US1995002125

申请日：1995-02-17

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  WEILAND, Ana, L. ,  KORNFELD, Richard, K. ,  KERR, Richard, J. ,  MALONEY, John, E. ,  WILSON, Nathaniel, B.

IPC: H04B07/005

CPC classification number: H04W52/06 ,  H04W52/36 ,  H04W52/52

Abstract: The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specification. This is accomplished by power detection and a correction accumulator that together generate a gain control signal by limiting the gain adjustment to a maximum value, even when the cell site communicating with the radiotelephone is sending power turn-up commands to the radiotelephone. This process includes dynamically correcting the output level of the transmitter due to gain variations in the transmitter stages or gain control elements.

Abstract translation: 本发明的方法和装置限制在优选实施例中在蜂窝系统中操作的无线电话机的输出功率。 这确保传输的边带和合成器相位噪声保持在一定的规格内。 这通过功率检测和校正累加器来实现，即使当与无线电话机通信的小区站点向无线电话机发送功率开启命令时，通过将增益调整限制为最大值来一起生成增益控制信号。 该过程包括由于发射机级或增益控制元件中的增益变化而动态校正发射机的输出电平。

公开(公告)号：WO1997010644A1

公开(公告)日：1997-03-20

申请号：PCT/US1996014917

申请日：1996-09-16

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  WILSON, Nathaniel, B.

IPC: H03G03/30

CPC classification number: H03G3/3042 ,  H03F1/3241 ,  H03F2200/294 ,  H03F2200/372

Abstract: The present invention provides linear, digital automatic gain control (AGC) in a radio. A received signal is demodulated to provide I and Q digital baseband signals. A received signal strength indication is determined from these signals and the resulting digital signal is adjusted to provide a logarithmic response (205). This signal is then integrated (210) to provide a digital receive AGC adjust signal. For the transmit AGC adjust, the digital receive AGC adjust signal is filtered (215) and then summed (270) with a scaled (260) closed loop power control command (265). The closed loop power control commands (265) are ignored (220) if they would result in increasing the transmit gain beyond the amplifier's designed maximum output. The outputs of the transmit and receive AGC amplifiers are linearized by transmit and receive linearizers, (225) and (240) respectively, which pre-distort the digital AGC adjust signals prior to digital to analog conversion (230) and (245).

Abstract translation: 本发明在无线电装置中提供线性，数字自动增益控制（AGC）。 接收信号被解调以提供I和Q数字基带信号。 从这些信号确定接收到的信号强度指示，并且调整所得数字信号以提供对数响应（205）。 然后，该信号被积分（210）以提供数字接收AGC调整信号。 对于发射AGC调整，数字接收AGC调整信号被滤波（215），然后用缩放（260）闭环功率控制命令（265）求和（270）。 如果闭环功率控制命令（265）会导致超出放大器设计的最大输出的发射增益，则忽略闭环功率控制命令（220）。 发射和接收AGC放大器的输出分别由发射和接收线性化电路（225）和（240）线性化，其在数模转换（230）和（245）之前预失真数字AGC调节信号。

公开(公告)号：WO1996020540A2

公开(公告)日：1996-07-04

申请号：PCT/US1995016363

申请日：1995-12-19

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  BLACK, Peter, J. ,  WILSON, Nathaniel, B.

IPC: H04B01/40

CPC classification number: H04B1/406 ,  H04B2201/70707 ,  H04L25/4904 ,  H04L27/142 ,  H04L27/2337 ,  H04W4/18 ,  H04W88/06

Abstract: A dual-mode digital communication system for communicating an information signal during operation in frequency-modulated (FM) and multiple-access modes is disclosed herein. The digital communication system includes a dual-mode transmitter (14) for transmitting the information signal using an FM communication signal during FM mode operation, and for transmitting the information signal using a multiple-access communication signal during multiple-access mode operation. The communication system further includes a dual-mode receiver (16) for receiving the FM communication signal during FM mode operation, and for receiving the multiple-access communication signal during multiple-access mode operation. Incorporated within the dual-mode receiver (16) is a digital demodulator (96) for recovering the information signal from the received FM signal during operation in the FM mode, and for recovering the information signal from the received multiple-access signal during multiple-access mode operation.

Abstract translation: 本文公开了一种用于在频率调制（FM）和多路访问模式中的操作期间传送信息信号的双模式数字通信系统。 数字通信系统包括在FM模式操作期间使用FM通信信号发送信息信号的双模发送器（14），并且在多访问模式操作期间使用多址通信信号发送信息信号。 通信系统还包括用于在FM模式操作期间接收FM通信信号的双模式接收器（16），并且用于在多址模式操作期间接收多址通信信号。 在双模式接收器（16）中并入的是数字解调器（96），用于在FM模式下操作期间从所接收的FM信号中恢复信息信号，并且用于在多模式接收器（16）期间从所接收的多址信号中恢复信息信号， 访问模式操作。

公开(公告)号：WO1995030274A1

公开(公告)日：1995-11-09

申请号：PCT/US1995005250

申请日：1995-04-28

Applicant: QUALCOMM INCORPORATED

Inventor： QUALCOMM INCORPORATED ,  PETERZELL, Paul, E. ,  WILSON, Nathaniel, B. ,  BLACK, Peter, J.

IPC: H03G03/20

CPC classification number: H03G3/3078 ,  H03G3/3089

Abstract: An automatic gain control (AGC) apparatus for a digital receiver is disclosed herein. The AGC apparatus includes an adjustable gain amplifier (18) having an input port for receiving an input signal, a control port for receiving a gain control signal, and an output port for providing an output signal. The AGC apparatus further includes a measurement circuit for generating a received power signal based on the power of the output signal. A saturating integrator (22) compares the received power signal to a reference signal and generates a gain control signal in response to a result of the comparison. The saturating integrator (22) includes a decision circuit (46) for enabling integration based on values of the received power signal, the reference signal, and the gain control signal. In a preferred implementation, the utilization of an input limiter in conjunction with an analog to digital converter enables accommodation of an increased input signal dynamic range.

Abstract translation: 本文公开了一种用于数字接收机的自动增益控制（AGC）装置。 AGC装置包括具有用于接收输入信号的输入端口的可调增益放大器（18），用于接收增益控制信号的控制端口和用于提供输出信号的输出端口。 AGC装置还包括用于基于输出信号的功率产生接收功率信号的测量电路。 饱和积分器（22）将接收的功率信号与参考信号进行比较，并且响应于比较的结果生成增益控制信号。 饱和积分器（22）包括用于基于接收功率信号，参考信号和增益控制信号的值进行积分的判定电路（46）。 在优选实施方式中，输入限幅器与模数转换器结合使用能够调节增加的输入信号动态范围。