| CPC H03K 5/2481 (2013.01) [G01R 19/16566 (2013.01); G06F 1/28 (2013.01); H03F 3/45071 (2013.01)] | 16 Claims |
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1. A comparator comprising:
an input port for receiving an input voltage;
an output port for providing an output voltage;
a resistive divider having a first node for providing a first voltage and a second node for providing a second voltage;
a first transistor having a control terminal coupled to the first node, a first terminal coupled to the input port, and a second terminal coupled to a common node;
a second transistor having a control terminal coupled to the second node, a first terminal coupled to the input port, and a second terminal coupled to the common node; and
a differential amplifier having a first input coupled to the first terminal of the first transistor, a second input coupled to the first terminal of the second transistor and an output coupled to the output port,
wherein the first transistor is coupled to the input port via a third transistor, and wherein the second transistor is coupled to the input port via a fourth transistor,
wherein the third transistor has a control terminal coupled to the first input of the differential amplifier, and wherein the fourth transistor has a control terminal coupled to the second input of the differential amplifier, and
wherein the first transistor is an anti-doped gate transistor in which the gate of the first transistor is doped with a doping type opposite to that of the first transistor type, and wherein the second transistor is a normal gate transistor in which the gate of the second transistor is doped with a same doping type as the second transistor type.
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