公开(公告)号：DE3476145D1

公开(公告)日：1989-02-16

申请号：DE3476145

申请日：1984-11-15

Applicant: MOTOROLA INC

Inventor： GRAY RANDALL C ,  JOSEPH ERIC D

IPC: H03F3/45 ,  G05F3/26 ,  H02H3/087 ,  H03F3/343 ,  H03K5/08 ,  H03F3/347

Abstract: A circuit (10) for detecting a very large output current threshold with respect to a low reference current. The threshold detector circuit includes a multiple transistor circuit (16,18) wherein a pair of emitter areas are ratioed with respect to each other, and which have common bases, and an error amplifier (26, 28, 32, 34) the inputs of which are connected to the respective emitters of the multiple transistor circuit. An output current is sourced from the emitter of the multiple transistor circuit (16, 18) having the larger area which output current is a function of the load coupled therewith to thereby produce a voltage at this emitter the magnitude thereof being a function of the output current. The current sourced from the other emitter of the multiple transistor circuit (16, 18) to the additional input of the error amplifier (26, 28, 32, 34) is proportional to the bias current (IREF) sourced therefrom by the error amplifier whereby the error amplifier (26,28,32,34) effectfully monitors the emitter voltages of the multiple transistor circuit (16, 18) to provide an error signal the sense of which switches as the output toad current varies above and below a threshold value that is a function of the magnitude of the reference current.

公开(公告)号：WO1982002964A1

公开(公告)日：1982-09-02

申请号：PCT/US1982000100

申请日：1982-01-25

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  BYNUM BYRON G ,  GRAY RANDALL C ,  JARRETT ROBERT B

IPC: G05F03/08

CPC classification number: G05F3/30

Abstract: A variable temperature coefficient level shifter includes a circuit which generates a voltage V u having a negative temperature coefficient and a voltage //c V u having a positive temperature coefficient. A control current is generated by placing a first resistor (R u) between V u and ground and a second resistor (R u) between //c V u and ground. Each of these currents forms a component of the control current which then has some net temperature coefficient. By properly scaling the resistors the control current may have any desired temperature coefficient between 2800ppm and 3000ppm. Once the temperature coefficient is set, a third resistor (R u) is provided through which the control current flows. The amplitude of the shift is then selected by selecting the value of resistor (R us).

Abstract translation: 可变温度系数电平移位器包括产生具有负温度系数的电压V u和具有正温度系数的电压V c U u的电路。 通过在V uu u和地之间放置第一个电阻（R uu）和在// c V u u u之间的第二个电阻（R u）与地之间产生一个控制电流。 这些电流中的每一个形成控制电流的分量，其然后具有一些净温度系数。 通过适当地缩放电阻器，控制电流可以具有在2800ppm和3000ppm之间的所需温度系数。 一旦设置了温度系数，就提供了一个第三个电阻（R u），控制电流通过该电阻流动。 然后通过选择电阻值（R us）来选择偏移的幅度。