Abstract:
A BiCMOS Transconductor differential stage (10) for high frequency filters comprises an input circuit portion having signal inputs (IN+,IN-) and comprising a pair of MOS transistors (M1,M2) having their respective gate terminals (G1,G2) corresponding to the signal inputs as well as an output circuit portion having signal outputs (OUT-,OUT+) and comprising a pair of two-pole transistors (Q1,Q2) connected together with a common base in a circuit node (B) and inserted between inputs (IN+,IN-) and outputs (OUT-,OUT+) in cascode configuration. The stage (10) in accordance with the present invention calls for a switching device (3) associated with at least one of said added two-pole transistors (Q1,Q2) to change the connections between the parasite capacitors present in the transconductor stage. The switching device (3) also comprises at least one added two-pole transistor (Q1x, Q2x) connected in a removable manner in parallel with the corresponding two-pole cascode transistor (Q1,Q2). In a variant embodiment there are also provided respective added MOS transistors (M1x,M2x) connected in parallel with the MOS transistors (M1,M2) of the input portion to change the ratio W:L of each of the input transistors (M1,M2).
Abstract:
Integrated device (100) comprising a plurality of conducting layers (115a-115c), each having a first (120ga-120gc) and a second (120va-120vc) power supply contact for providing, respectively, a first and a second binary value, and means for supplying at least one identification bit of a version of the integrated device (100); the integrated device (100) includes, for each identification bit, parity check means (135abi, 135bci) having a plurality of input terminals whose number is equal to the number of conducting layers (115a-115c), and an output terminal, each input terminal being connected to one contact selected from the first (120ga-120gc) and the second (120va-120vc) power supply contacts of a corresponding one of the conducting layers (115a-115c), and the output terminal supplying the corresponding identification bit.