公开(公告)号：US4967151A

公开(公告)日：1990-10-30

申请号：US420690

申请日：1989-10-11

申请人： Arnold E. Barish ,  David A. Kiesling ,  Mark D. Mayo ,  Walter A. Svarczkopf

发明人： Arnold E. Barish ,  David A. Kiesling ,  Mark D. Mayo ,  Walter A. Svarczkopf

IPC分类号： G01R31/30 ,  G06F11/00

CPC分类号： G06F11/0754 ,  G01R31/3004

摘要： A circuit for testing a differential current switching logic circuit of the type including: a bias potential, two resistors connected to the bias potential, and apparatus responsive to an input signal for sinking a first current through a selected one of the resistors so as to generate first and second differential output signals at the resistors. The circuit includes first, second, and third transistors, each having first and second terminals for conducting a current responsive to a signal applied to a control terminal. Apparatus are provided for supplying a current. The first transistor has its first terminal connected to the current supplying means, and its second terminal connected to a circuit node. The second transistor has its first terminal connected to the circuit node, its second terminal connected to the bias potential, and its control terminal connected to sense the potential at a selected one of the resistors. The third transistor has its first terminal connected to the circuit node, its second terminal connected to the selected resistor, and its control terminal connected to sense the potential at the other of the resistors. The circuit functions to sense the potential difference between the first and second differential output signals. When the potential difference is less than a predetermined level, a second current is sunk through the one resistor so as to lower the potential of the output signal associated with the one resistor relative to the potential of the output signal associated with the other resistor.

摘要翻译： 一种用于测试类型的差分电流开关逻辑电路的电路，包括：偏置电位，连接到偏置电位的两个电阻器，以及响应于输入信号的装置，用于将第一电流吸收通过所选择的一个电阻器，以便产生 电阻器上的第一和第二差分输出信号。 电路包括第一，第二和第三晶体管，每个具有第一和第二端子，用于响应于施加到控制端子的信号传导电流。 提供用于提供电流的装置。 第一晶体管的第一端子连接到电流供应装置，其第二端子连接到电路节点。 第二晶体管的第一端子连接到电路节点，其第二端子连接到偏置电位，并且其控制端子被连接以感测所选择的一个电阻器中的电位。 第三晶体管的第一端子连接到电路节点，其第二端子连接到所选择的电阻器，并且其控制端子连接以感测另一个电阻器上的电位。 电路用于检测第一和第二差分输出信号之间的电位差。 当电位差小于预定电平时，第二电流通过一个电阻器沉没，以便降低与一个电阻器相关联的输出信号相对于与另一个电阻器相关联的输出信号的电位的电位。