Siemens Aktiengesellschaft

Jean Wilwert

Bruno Scheckel

Stefan Heinen

Stefan Beyer

Werner Veit

Helmut Herrmann

An integrated circuit configuration for generating a reference current by bipolar technology includes a transistor of one conduction type having a control terminal being acted upon by a reference voltage and having a load path. An externally connectable resistor is to be connected between the load path of the transistor and a reference potential. A current mirror configuration has an input side connected between the load path of the transistor and a supply voltage source and has an output for picking up a reference current.

Circut configuration for generating a reference current

A circuit configuration being made by differential technology for dividing a clock signal with switchable divider ratios of 4/5 by emitter coupled logic, includes first, second and third series-connected flip-flops each having an output, a data input and a clock input. The output of the second flip-flop is coupled to the data input of the third flip-flop, and the clock inputs of the first, second and third flip-flops are acted upon by a clock signal. A first AND gate is connected upstream of the first flip-flop and has a first input being acted upon by a control signal for switching over the divider ratio, and a second input being acted upon by an inverted signal from the output of the third flip-flop. A second AND gate is connected between the first and second flip-flops and has an output connected to the data input of the second flip-flop, a first input receiving an inverted signal from the output of the first flip-flop, and a second input being acted upon by the inverted signal from the output of the third flip-flop.

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Munchen, Germany

Jean Wilwert