Abstract: A miniature SMD-HPLED replaceable lamp (10) comprising a main body (1) which can be alternatively made of ceramic or metallic material, an electrical connector (20) housed in said main body (1) and a PCB (3a) embedding an HPLED lighting source. The connector (20) is suitably designed both for assuring an electrical continuity between PCB (3a) and an external power supply and locking it in a slot (2) formed on said main body (1).

Abstract: A miniature SMD-HPLED replaceable lamp (10) comprising a main body (1) which can be alternatively made of ceramic or metallic material, an electrical connector (20) housed in said main body (1) and a PCB (3a) embedding an HPLED lighting source. The connector (20) is suitably designed both for assuring an electrical continuity between PCB (3a) and an external power supply and locking it in a slot (2) formed on said main body (1).

Abstract: A logarithmic linear variable gain CMOS amplifier includes first and second differential pairs of transistors forming a differential input, with each differential pair of transistors including a common source node. A pair of diode-connected load transistors is connected to the first and second differential pairs of transistors, and a third differential pair of transistors is connected to the pair of diode-connected load transistors. The third differential pair of transistors include respective gates connected together and in parallel to gates of the first and second differential pairs of transistors. First and second current mirrors are respectively connected to the common source nodes of the first and second differential pairs of transistors for programmably injecting respective bias currents thereto, with a sum of the respective bias currents remaining constant.

Abstract: A step gain-variable CMOS amplifier includes an input pair of transistors, a bias current generator connected between a common source node of the input pair of transistors and a ground node, and a pair of load transistors. The pair of load transistors is connected between a supply voltage node and, respectively, to the drain nodes of the input pair of transistors. The CMOS amplifier includes a plurality of second input pairs of transistors to be connected in parallel to the input pair of transistors for increasing the effective width of the resultant transistors. Alternativelty, the CMOS amplifier includes a plurality of second load pairs of transistors to be connected in parallel to the load pair of transistors for increasing the effective width of the resultant transistors. Pairs of path selection switches may be programmably closed for connecting in parallel the selected pairs of transistors.

Abstract: A step gain-variable CMOS amplifier includes an input pair of transistors, a bias current generator connected between a common source node of the input pair of transistors and a ground node, and a pair of load transistors. The pair of load transistors is connected between a supply voltage node and, respectively, to the drain nodes of the input pair of transistors. The CMOS amplifier includes a plurality of second input pairs of transistors to be connected in parallel to the input pair of transistors for increasing the effective width of the resultant transistors. Alternativelty, the CMOS amplifier includes a plurality of second load pairs of transistors to be connected in parallel to the load pair of transistors for increasing the effective width of the resultant transistors. Pairs of path selection switches may be programmably closed for connecting in parallel the selected pairs of transistors.

Abstract: A logarithmic linear variable gain CMOS amplifier includes first and second differential pairs of transistors forming a differential input, with each differential pair of transistors including a common source node. A pair of diode-connected load transistors is connected to the first and second differential pairs of transistors, and a third differential pair of transistors is connected to the pair of diode-connected load transistors. The third differential pair of transistors include respective gates connected together and in parallel to gates of the first and second differential pairs of transistors. First and second current mirrors are respectively connected to the common source nodes of the first and second differential pairs of transistors for programmably injecting respective bias currents thereto, with a sum of the respective bias currents remaining constant.

Abstract: An improved up-and-down pulley device for suspending height adjustable lamps or any other article requiring a regulated descent. The device comprises an adjustable friction system for the lamp descent, wherein the suspension wire winding drum is free to rotate in the wire return or rewinding direction, while its rotation, around a central stationary axis, is braked and regulated by the friction system in the direction of wire unwinding and therefore of lamp descent, rotation being controlled by a ratchet wheel of special structure. The device has a silent, precise and adjustable operation and a compact, sturdy structure comprising a limited number of elements.