Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1993-07-06
1995-03-14
Stephan, Steven L.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327482, 327 65, H03K 1760
Patent
active
053979320
ABSTRACT:
A switching stage includes a differential amplifier configuration. An emitter follower transistor is connected downstream of the differential amplifier configuration. A terminal is provided for a first supply potential. A terminal for a second supply potential is connected to the collector of the emitter follower transistor. A controllable current source is connected between the emitter of the emitter follower transistor and the terminal for the first supply potential. The current source has a control input. A resistor has a first terminal connected to the emitter of the emitter follower transistor and a second terminal connected to a switching stage output. A circuit having a signal output is connected to the first and second terminals of the resistor and to the terminal for the first supply potential, for supplying a signal at the signal output being dependent on the polarity of a voltage dropping at the resistor. The control input of the current source is connected to the signal output of the signal supplying circuit for controlling the current source to cause a high current to flow when the first terminal of the resistor is at a more negative potential than the second terminal of the resistor and to cause a low current to flow when the first terminal of the resistor is at a more positive potential than the second terminal of the resistor.
REFERENCES:
patent: 3535546 (1970-10-01), Davis
patent: 3702944 (1972-11-01), Shigaki
patent: 4205273 (1980-05-01), Yoshida
patent: 4868421 (1989-09-01), Herndon et al.
patent: 4896333 (1990-01-01), Can
patent: 5059829 (1991-10-01), Flannagan et al.
patent: 5159213 (1992-10-01), Johnson
patent: 5216296 (1993-06-01), Tsunoi et al.
patent: 5223753 (1993-06-01), Lee et al.
Greenberg Laurence A.
Lerner Herbert L.
Riley Shawn
Siemens Aktiengesellschaft
Stephan Steven L.
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