Signal level shifter integrated circuit - has negative conductive, highly-doped layer conductively coupled to emitter of input transistor

摘要

This integrated circuit shifts a signal voltage level without changing its amplitude as may be required, e.g. in order to make the signal TTL-compatible. The distributed capacities thus introduced, far from degrading the signal, are arranged to improve the pulse edge. The output of emitter follower transistor (T1) via a resistor (R) and a constant current source (K) provides the level shifted signal. Distributed capacity (C1) is short circuited resulting in another capacitor (C2) bridging the resistor (R) and improving pulse shape.