Patent ID: 6882216

Claim:
A high pass filter, comprising: a capacitor connected between an input port and an output port; a first transistor having a first terminal connected to a first voltage source and a second terminal connected to the output port; a second transistor having a first terminal connected to the second terminal of the first transistor and a second terminal connected to ground; and a second voltage source coupled to a third terminal of the first transistor and the second transistor such that the first and the second transistors are operated as a large-resistance resistor, the second voltage source comprising: a third transistor having a first terminal connected to the first voltage source, a second terminal connected to the third terminal of the first and the second transistor, and a third terminal connected to the second terminal thereof; and a four transistor having a first terminal connected to the second terminal of the first transistor, a second terminal connected to ground, and a third terminal connected to the first terminal thereof.