公开(公告)号：US3839647A

公开(公告)日：1974-10-01

申请号：US41395973

申请日：1973-11-08

申请人： LITTON SYSTEMS INC

发明人： SIMMONS D

IPC分类号： G06G7/28 ,  H03K17/00

CPC分类号： G06G7/28

摘要： The disclosed invention includes a transistor having a predetermined Beta characteristic, a first resistance means coupled between a first voltage source and the collector and a second resistance means connected between a second voltage source and the emitter and an operational amplifier having its input connected to the emitter and an output connected to the base of the transistor wherein a constant voltage is automatically maintained at the emitter. By varying the magnitude of one of the voltage sources, such as the first voltage source, while maintaining the other essentially constant the output voltage obtained at the collector remains at a constant level over a predetermined range of magnitudes of the input voltage source up to an input voltage denoted the ''''breakpoint voltage,'''' and for greater magnitudes of input voltage provides an output voltage which is directly proportional to the amount by which the input voltage exceeds such breakpoint voltage. And in a novel function generator circuit which employs a plurality of such nonlinear elements adjusted to different breakpoint voltage levels the operational amplifier output is connected in parallel to each of the base electrodes of the plurality of transistors and the output of each transistor is taken from the collector and summed together in a suitable summing network to provide the function generator output voltage. In another aspect of the function generator, a linear resistor network which forms a voltage divider is coupled to the source of variable voltage to provide an output that is directly proportional to the magnitude of the input source over the entire range; this output is summed together with the output of the nonlinear circuits to provide a more general output characteristic.

摘要翻译： 所公开的发明包括具有预定β特性的晶体管，耦合在第一电压源和集电极之间的第一电阻装置以及连接在第二电压源与发射极之间的第二电阻装置和运算放大器，其输入端连接到发射极 以及连接到晶体管的基极的输出，其中在发射极处自动保持恒定电压。 通过改变诸如第一电压源的电压源之一的大小，同时保持另一个基本上恒定，在集电极处获得的输出电压在输入电压源的大小的预定范围内保持恒定电平，直到达到 输入电压表示为“断点电压”，而对于较大幅度的输入电压则提供与输入电压超过这种断点电压的量成正比的输出电压。 并且在采用调整到不同断点电压电平的多个这样的非线性元件的新颖函数发生器电路中，运算放大器输出与多个晶体管的每个基极并联连接，每个晶体管的输出从 收集器并在一个合适的求和网络中求和，以提供函数发生器的输出电压。 在功能发生器的另一方面，形成分压器的线性电阻网络耦合到可变电压源，以提供与整个范围上的输入源的幅度成正比的输出; 该输出与非线性电路的输出相加，以提供更一般的输出特性。