Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Patent
1998-07-07
2000-05-30
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
134112, H03K 512, H03B 100
Patent
active
060695099
ABSTRACT:
An output stage comprising an input terminal (IP) for receiving an input signal (V.sub.i); an output terminal (OP) for delivering an output signal (V.sub.o) in response to the input signal (V.sub.i); a first (1) and second (2) supply terminal for receiving a supply voltage (SV); a field effect transistor (Q1) comprising a gate (GN), and a main current path between a source and a drain coupled between the first supply terminal (1) and the output terminal (OP); and slewing control means (SCM) for reducing the speed of voltage change at the gate (GN) of the field effect transistor (Q1) for reducing the speed of current change through the main current path of the field effect transistor (Q1) when the output signal (V.sub.o) changes from a first steady state (FST) via a transition area (TRE) to a second steady state (SST). The slewing control means (SCM) comprises first means for reducing the gate-source voltage V(GN) between the gate (GN) and the source of the field effect transistor (Q1) in at least part of the transition area (TRE) when the field effect transistor (Q1) changes from a nonconducting state to a conducting state and thus causing the output signal (V.sub.o) to be changed from the first steady state (FST), via the transition area (TRE), to the second steady state (SST). The first means avoid the field effect transistor (Q1) to become out of saturation, and thus avoids an abrupt change of the current through the field effect transistor (Q1), thereby avoiding relatively large voltage spikes at the first supply voltage (SV) and/or the output signal (V.sub.o).
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Tran Toan
U.S. Philips Corporation
Wieghaus Brian J.
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