Abstract: A high-speed bipolar-to-CMOS logic converter circuit, including an input stage, including a differential amplifier meant to be connected to a bipolar-logic circuit portion and to be supplied by the supply voltage of the bipolar-logic portion, and an output stage, which is supplied by the voltage of a CMOS-logic circuit portion, a dynamic level shifting circuit interposed between the input stage and the output stage, the output stage being connected to the CMOS-logic circuit portion.

Abstract: A low noise integrated differential AC amplifier includes a cascode differential input stage comprising first and second branches. The first branch includes a first input transistor and the second branch includes a second input transistor. Each transistor has a collector and an emitter, and the emitters being connected together to define a common emitter node. The amplifier also includes two output stages connected to respective outputs of the first and second branches. Each output stage may include a common collector transistor stage including a bias current generator and a feedback circuit. A first biasing circuit forces a first biasing current through the first input transistor by injecting the first biasing current on the collector thereof. A second biasing circuit forces a second biasing current through the first input transistor by injecting the second biasing current on the collector thereof.