Abstract:
The electronic device (15) is formed in a die including a body (2) of semiconductor material having a first face (9) covered by a covering structure (7, 10) and a second face (12). An integral spreader of metal is grown galvanically on the second face during the manufacture of a wafer, prior to cutting into dice. The covering structure (7, 10) comprises a passivation region (7) and a protective region (10) of opaque polyimide; the protective region (10) and the passivation region (7) are opened (11) above the contact pads (6) for the passage of leads (22).
Abstract:
The manufacture process comprises: forming a first wafer (20) of semiconductor material housing integrated electronic components forming a microactuator control circuit and a signal preamplification circuit (22); forming microactuators (10), each comprising a rotor (52) and a stator (51), in a surface portion of a second wafer (28) of semiconductor material; attaching the second wafer (28) to the first wafer (20), with the surface portion of the second wafer facing the first wafer; thinning the second wafer (28); attaching the second wafer (28) to a third wafer (75) to obtain a composite wafer (78); thinning the first wafer (20); cutting the composite wafer (78) into a plurality of dice (77) connected to a protection chip (75'); removing the protection chip (75'); attaching read/write transducers (6) to the dice (77); and attaching the dice to supporting blocks (3) for hard-disk drivers (1).
Abstract:
In a suspension arm (125) for at least one head (120) of a disk storage device, in which the suspension arm (125) terminates in a flexible suspension element (127) for urging the at least one head (120) towards the disk (105), the suspension element (127) has a hollow structure.
Abstract:
A power amplifier comprising at least a load element (2) and at least an active element (3) inserted, in series to each other, between a first and a second voltage reference (Vdd, GND) is described. Advantageously, according to the invention, the load element (2) comprises a DMOS transistor (Ml).