-
公开(公告)号：US4906836A
公开(公告)日：1990-03-06
申请号：US248506
申请日：1988-09-23
申请人： Tomitaka Yamashita , Mikio Kyomasu
发明人： Tomitaka Yamashita , Mikio Kyomasu
摘要： An integrated circuit includes an operational amplifier having inverting and noninverting input terminals, a first logarithmic amplifier having inverting and noninverting input terminals, and a second logarithmic amplifier having inverting and noninverting input terminals. The output of the first logarithmic amplifier is connected to the noninverting input terminal of the second logarithmic amplifier, and the output of the second logarithmic amplifier is connected to the inverting input terminal of the operational amplifier.
摘要翻译： 集成电路包括具有反相和非反相输入端的运算放大器，具有反相和非反相输入端的第一对数放大器和具有反相和同相输入端的第二对数放大器。 第一对数放大器的输出连接到第二对数放大器的非反相输入端，第二对数放大器的输出端连接到运算放大器的反相输入端。
-
公开(公告)号：US4786970A
公开(公告)日：1988-11-22
申请号：US171977
申请日：1988-03-23
申请人： Leslie G. Moore
发明人： Leslie G. Moore
摘要： A D.C. stabilized logarithmic amplifier which uses bipolar transistors which produces an output voltage V.sub.out(comp) temperature compensated for the saturation leakage current I.sub.s and the thermal voltage V.sub.t.
摘要翻译： 一种D.C.稳定对数放大器，其使用双极晶体管，其产生补偿饱和漏电流Is和热电压Vt的输出电压Vout（comp）温度。
-
公开(公告)号：US4631745A
公开(公告)日：1986-12-23
申请号：US727936
申请日：1985-04-26
申请人： Charles J. Marik
发明人： Charles J. Marik
摘要： An analog divider circuit as for use in AM stereophonic receivers provides minimum phase variation with control voltage level change, by means of a feedback circuit. The division process is performed by subtracting logarithms of currents produced by the dividend and divisor voltages, then deriving the antilog of the difference or remainder. At the critical point in the process, where junction capacitances do not accurately track the change in the control level, cross-coupled capacitors stabilize the circuit by feeding back a signal from the circuit output to minimize any undesired phase changes.
摘要翻译： 用于AM立体声接收机的模拟分频器电路通过反馈电路提供具有控制电压电平变化的最小相位变化。 通过减去由除数和除数电压产生的电流的对数，然后导出差异或余数的对数来执行除法处理。 在该过程的临界点，当结电容不能精确地跟踪控制电平的变化时，交叉耦合电容器通过从电路输出反馈信号来使电路稳定，以最小化任何不期望的相位变化。
-
公开(公告)号：US4604532A
公开(公告)日：1986-08-05
申请号：US694462
申请日：1985-01-24
申请人： Barrie Gilbert
发明人： Barrie Gilbert
CPC分类号： G06G7/24
摘要： A log-amp or log-ratio circuit for producing a temperature-independent output signal corresponding to the logarithm of the ratio of a pair of input currents. The basic logarithm function is generated by a pair of opposed P-N junctions through which the respective input currents flow. Temperature compensation is effected by a circuit including a second pair of opposed P-N junctions which receive a PTAT current split between the junctions in accordance with a modulation factor proportional to the desired logarithmic function. The temperature-induced signal variations produced by the PTAT current source are equal and opposite to the temperature-induced signal variations produced in the first pair of P-N junctions, and a temperature-independent output signal is developed in accordance with the modulation factor applied to the PTAT current through the second pair of P-N junctions.
摘要翻译： 对数放大器或对数比电路，用于产生对应于一对输入电流的比率的对数的与温度无关的输出信号。 基本对数函数由相应的输入电流流过的一对相对的P-N结产生。 温度补偿由包括第二对相对P-N结的电路实现，该第二对相对的P-N结根据与期望的对数函数成比例的调制因子接收在接合之间的PTAT电流分流。 由PTAT电流源产生的温度感应信号变化与在第一对PN结中产生的温度感应信号变化相等并且相反，并且根据施加到 PTAT电流通过第二对PN结。
-
公开(公告)号：US4507615A
公开(公告)日：1985-03-26
申请号：US450303
申请日：1982-12-16
申请人： Glenn Bateman
发明人： Glenn Bateman
摘要： A non-linear amplifier system comprises two amplifier stages, a limiter and correction stage and a combining stage. The first amplifier stage amplifies low input signal levels linearly and higher input signal levels non-linearly. The limiter and correction stage amplifies linearly input signal levels corresponding to low input signal levels of the first amplifier stage. The second amplifier stage amplifies non-linearly input signals corresponding to low input signal levels of the first amplifier stage. The combining stage combines the output voltage signals of the first and second amplifier stages and the limiter and correction stage. For a range of low input signal levels, the output voltage signal of the combining stage is representative of the output voltage signal of the second amplifier stage, for a range of high input signal levels, the output voltage signal of the combining stage is representative of the output voltage signal of the first and second amplifier stages, and for a crossover range of input signal levels, which is intermediate the low range and the high range, the output voltage signal of the combining stage is representative of the output voltage signal of the second amplifier stage.
摘要翻译： 非线性放大器系统包括两个放大器级，限幅器和校正级以及组合级。 第一放大器级非线性放大低输入信号电平线性和较高输入信号电平。 限幅器和校正级放大对应于第一放大器级的低输入信号电平的线性输入信号电平。 第二放大器级放大对应于第一放大器级的低输入信号电平的非线性输入信号。 组合级结合了第一和第二放大器级的输出电压信号以及限幅器和校正级。 对于低输入信号电平的范围，组合级的输出电压信号代表第二放大级的输出电压信号，对于高输入信号电平的范围，组合级的输出电压信号代表 第一和第二放大器级的输出电压信号，以及组合级的输出电压信号之间的输入信号电平的交叉范围，该输出信号电平位于低范围和高范围之间，代表了输出电压信号 第二放大器级。
-
公开(公告)号：US4454433A
公开(公告)日：1984-06-12
申请号：US293470
申请日：1981-08-17
申请人： David R. Welland
发明人： David R. Welland
CPC分类号： G06G7/24
摘要： The invention relates to an improved voltage control amplifier of the type comprising a gain cell. The gain cell is of the type that includes at least one log transistor for each polarity of input signal and at least one antilog transistor for each log transistor, means for algebraically summing a control signal with the log signal provided by each log transistor and means for providing a symmetry adjust signal to the base of a selected transistor of the cell so that the cell provides substantially the same gain for each polarity of input signal when the control signal level is set for zero. The improvement comprises means for generating a correction signal as a function of the control signal level so as to substantially correct for differences between the early effects exhibited by said transistors as said control signal varies and means for applying the correction signal to the base of one the transistors.
摘要翻译： 本发明涉及一种包括增益单元的改进的电压控制放大器。 增益单元是对于每个对数晶体管的每个极性包括至少一个对数晶体管的类型，以及用于每个对数晶体管的至少一个反对逻辑晶体管，用于将控制信号与每个对数晶体管提供的对数信号进行代数求和的装置， 向所述单元的所选晶体管的基极提供对称调整信号，使得当所述控制信号电平被设置为零时，所述单元为输入信号的每个极性提供基本上相同的增益。 该改进包括用于产生作为控制信号电平的函数的校正信号的装置，以便基本上校正所述控制信号变化时由所述晶体管呈现的早期效应之间的差异，以及用于将校正信号施加到一个的基极的装置 晶体管。
-
97.发明授权
公开(公告)号：US4415820A
公开(公告)日：1983-11-15
申请号：US237105
申请日：1981-02-23
申请人： Urs Zogg
发明人： Urs Zogg
CPC分类号： G06G7/24
摘要： To provide for exactly exponential relationship between the collector current and the voltage applied between the bases of the differential circuit, two branches are provided, each containing a series connected circuit including transistors of respectively opposite conductivity type, and resistances positioned in each branch of such value that the sum of the voltage drops of connection and contact resistances arising in the respective branches are compensated. The values of the resistances are so selected that the voltage drop across the respective resistance matches the sum of the voltage drops due to the connection and contact resistances of the opposite branch.
摘要翻译： 为了提供集电极电流和施加在差分电路的基极之间的电压之间的精确指数关系，提供两个分支，每个分支包含串联连接的电路，其包括分别相反导电类型的晶体管，以及位于每个分支中的电阻值 在各个分支中出现的连接电压和接触电阻的电压之和被补偿。 电阻的值被选择成使得相应电阻上的电压降与由于相对支路的连接和接触电阻引起的电压降的总和相匹配。
-
公开(公告)号：US4333023A
公开(公告)日：1982-06-01
申请号：US159989
申请日：1980-06-16
申请人： Rush W. Hood, Jr.
发明人： Rush W. Hood, Jr.
CPC分类号： G06G7/24
摘要： A logarithmic converter circuit comprising an emitter-coupled pair of transistors and a pair of operational amplifiers is provided with a temperature-stabilized environment so that accurate logarithmic conversion is facilitated. One of the pair of transistors is utilized as a temperature sensor to provide a temperature control voltage, which in turn controls the power applied to a heating element disposed adjacent the pair of transistors to maintain a constant semiconductor junction temperature. The heating element may suitably be one or more transistors disposed proximate the pair of transistors on a common substrate. The absolute temperature of the sensor transistor base-to-emitter junction is established by the use of precise gain-setting components, and by adjusting the temperature reference voltage for the correct system gain.
摘要翻译： 包括发射极耦合的晶体管对和一对运算放大器的对数转换器电路具有温度稳定的环境，从而便于精确的对数转换。 一对晶体管中的一个被用作温度传感器以提供温度控制电压，其继而控制施加到邻近该对晶体管的加热元件的功率以保持恒定的半导体结温度。 加热元件可以适当地设置在公共衬底上靠近一对晶体管设置的一个或多个晶体管。 传感器晶体管基极到发射极结的绝对温度是通过使用精确的增益设置元件建立的，并通过调整温度参考电压来获得正确的系统增益。
-
公开(公告)号：US4232233A
公开(公告)日：1980-11-04
申请号：US974582
申请日：1978-12-29
申请人： David E. Clouser , Steven J. Engel
发明人： David E. Clouser , Steven J. Engel
IPC分类号： G06G7/24
CPC分类号： G06G7/24
摘要： The linear component appearing in the output of two logarithmic amplifiers connected for temperature compensation and having matched feedback semiconductor devices is cancelled in a resistor connected in series with a logarithmic device between the output and a point of reference potential so that a purely logarithmic voltage appears at their junction.
摘要翻译： 出现在用于温度补偿并具有匹配的反馈半导体器件的两个对数放大器的输出中的线性分量在与输出和参考电位之间的对数器件串联连接的电阻器中被抵消，使得纯对数电压出现在 他们的交界处。
-
公开(公告)号：US4223271A
公开(公告)日：1980-09-16
申请号：US909110
申请日：1978-05-24
申请人： Masamichi Furukawa
发明人： Masamichi Furukawa
CPC分类号： G01J1/4214 , G01D1/04 , G06G7/186 , G06G7/24
摘要： An integrating capacitor is connected between the inverting input and the output of an operational amplifier. A plurality of resistors are connected in series to the inverting input. A plurality of capacitors are connected between the inverting input and junctions of the resistors respectively. The time required for the output voltage of the operational amplifier to reach a predetermined level is an exponential function of a voltage applied to the inverting input through the resistors.
摘要翻译： 积分电容器连接在运算放大器的反相输入和输出之间。 多个电阻器串联连接到反相输入端。 多个电容器分别连接在电阻器的反相输入和接点之间。 运算放大器的输出电压达到预定电平所需的时间是通过电阻施加到反相输入端的电压的指数函数。
-
-
-
-
-
-
-
-
-
搜索结果
401 条记录 (耗时 0.013 秒)
