Abstract:
A BiCMOS ECL/CMOS interface circuit for converting a high frequency pseudo-ECL signal with a voltage swing in the order of few hundreds of millivolts into a CMOS signal with a voltage swing substantially equal to the supply voltage, comprising a differential input stage composed of a pair of NPN bipolar junction transistors (Q1, Q2) in a common emitter configuration, a bias current generator (IBIAS) functionally coupled between the common emitter node of said NPN transistors and ground and means driven by a respective transistor of said input pair (Q1, Q2) driving the control node of a respective output CMOS stage (M5-M7, M6-M8), is provided with first and second common-collector stages each constituted by an NPN bipolar junction transistor(Q3, Q4) and driven by a respective transistor of said pair of NPN transistors (Q1, Q2); and with a pair of identical PMOS transistors (M1, M2) with gates connected in common to a bias voltage (POL), each PMOS transistor (M1, M2) having a source coupled to the emitter of a respective transistor (Q3, Q4) of said common-collector stages and a drain connected to a load current generator (I) and to said control node of a respective output CMOS stage (M5-M7, M6-M8), for reducing current absorption without impairing performance.
Abstract:
A transconductor comprising a differential stage composed of a pair of input transistors, a resistive line of degeneration convecting the sources of the input transistors of said differential stage, a pair of bias current generators, each coupled between the source of a respective input transistor and a common ground node, has said resistive line of degeneration composed of one or more transistors in series, the gate of which is coupled to a voltage at least equal to the common mode voltage of the differential stage, and which are sized to operate in the triode region.
Abstract:
A transconductor comprising a differential stage composed of a pair of input transistors, a resistive line of degeneration convecting the sources of the input transistors of said differential stage, a pair of bias current generators, each coupled between the source of a respective input transistor and a common ground node, has said resistive line of degeneration composed of one or more transistors in series, the gate of which is coupled to a voltage at least equal to the common mode voltage of the differential stage, and which are sized to operate in the triode region.