Serial interface receiver and an offset calibration method thereof
A parallel e-fuse device including: a first e-fuse to receive an input voltage and transfer a first fuse current to an output terminal; and a second e-fuse to receive the input voltage and transfer a second fuse current to the output terminal, the first e-fuse includes: a power transistor to control the first fuse current according to a gate voltage; a clamp amplifier to provide a charging current to charge a gate of the power transistor, the charging current being obtained by monitoring a feedback voltage; a balance amplifier to provide a first sinking current to discharge the gate of the power transistor, the first sinking current being obtained by comparing a current sensing signal with a current monitoring signal, wherein the clamp amplifier generates the charging current according to a differential voltage between the feedback voltage and a reference voltage.
1 . A parallel e-fuse device comprising:
a first e-fuse configured to receive an input voltage and transfer a first fuse current to an output terminal, and
a second e-fuse configured to receive the input voltage and transfer a second fuse current to the output terminal,
wherein the first e-fuse comprises:
a power transistor configured to control a magnitude of the first fuse current according to a gate voltage and transmit the first fuse current to the output terminal;
a clamp amplifier configured to provide a charging current to charge a gate of the power transistor, the charging current being obtained by monitoring a feedback voltage obtained by feeding back a voltage of the output terminal;
a balance amplifier configured to provide a first sinking current to discharge the gate of the power transistor, the first sinking current being obtained by comparing a current sensing signal obtained by sensing the first fuse current with a current monitoring signal that corresponds to a result of monitoring the second fuse current,
wherein the clamp amplifier generates the charging current according to a differential voltage between the feedback voltage and a reference voltage.
2 . The device of claim 1 , wherein the clamp amplifier generates the charging current smaller than the first sinking current when the differential voltage is ‘0V’ or less.
3 . The device of claim 1 , wherein when a difference between the feedback voltage and the reference voltage is equal to or less than a reference value, the parallel e-fuse device operates in a soft-start mode or a clamping mode.
4 . The device of claim 1 , wherein the clamp amplifier generates the charging current greater than the first sinking current when the differential voltage is greater than a reference value.
5 . The device of claim 1 , wherein the first e-fuse includes an active current mirror for mirroring the charging current to the gate of the power transistor using a charge pump voltage.
6 . The device of claim 1 , wherein the first e-fuse includes a mode detection amplifier configured to generate the reference voltage using a clamp reference voltage and a ramp voltage.
7 . The device of claim 1 , wherein the first e-fuse includes a current sensor configured to sense the first fuse current and generate the current sensing signal.
8 . The device of claim 7 , wherein the first e-fuse includes an overcurrent protection amplifier configured to generate a second sinking current to discharge the gate of the power transistor, the second sinking current being obtained by comparing the current sensing signal with an overcurrent reference level.