Patent ID: 7598798

Claim:
A trimmer device for adjusting a reference signal of a target circuit, the trimmer device comprising: a switch controlling module comprising: a fuse, selectively melted according to an ideal value of the reference signal; and a control signal generating circuit, coupled to the fuse, for generating a control signal according to a conducting condition of the fuse; and an impedance adjusting circuit, coupled to the target circuit and the switch controlling module, the impedance adjusting circuit comprising: a switch module, selectively conductive according to the control signal; and an impedance network, coupled to the switch module, for determining an equivalent impedance of the impedance network according to a conducting condition of the switch module such that the reference signal is adjusted; wherein the switch module comprises N switch devices, the impedance network comprises N impedance devices, a first impedance device and at least an N th impedance device of the N impedance devices are connected in series, a first switch device of the N switch devices is connected in parallel with the first impedance device, an N th switch device of the N switch devices is connected in parallel with the serially connected first impedance device and at least the N th impedance device, wherein N is an integer greater than 1.