Hong Kong Applied Science and Technology Research Institute Company, Limited

Chik Wai Ng

David Kwok Kuen Kwong

Kam Chuen Wan

Ho Ming Karen Wan

Yat To Wong

A feedback controller comprises first and second feedback circuits. The first feedback circuit is connected between an input node and an output node and has an error node. The first feedback circuit comprising a feedback amplifier for comparing a feedback signal to a reference signal and providing an error signal, and a comparator for comparing the error signal to a second reference signal and providing an output signal. The second feedback circuit is connected between the input node and the error node and comprises a current source coupled to the error node and a controller coupled to the input node for controlling the current source in response to a value of the feedback signal being above or below a threshold value.

Feedback controller having multiple feedback paths

The fuse cell architecturefor the presently claimed invention employs a multiple fuse structurearchitecture in lieu of a single fuse structure. As such, the terminals of these fuse structures that couple to other on-chip devices are always at ground potential throughout the application of programming voltage to the fuse pads. This approach overcomes previous single fuse problems owing to the fact that a sufficiently high programming voltage can be applied to blow fuse structures with unexpectedly high resistance without damaging nearby on-chip devices. Furthermore, even if one of the fuse structurespossessed an abnormally high resistance which would not be blown under typical conditions, the desired circuit trimming result can still be achieved owing to the blowing of the other fuse structure in the fuse cell

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Hong Kong, China

Chik Wai Ng