LOW-PASS FILTER WITH SUPER SOURCE FOLLOWER AND TRANSMISSION ZERO CONTROLLING METHOD
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United States of America Patent
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Dec 15, 2017
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Dec 16, 2016
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Abstract
A low-pass filter with a super source follower is disclosed. The low-pass filter includes biquad cells. Each biquad cell includes the super source follower, a first capacitor, a second capacitor and a zero controlling capacitor. The super source follower includes a first MOSFET and a second MOSFET. A gate electrode of first MOSFET is coupled to an input voltage. A source electrode of first MOSFET is coupled to a node between the first capacitor and the second capacitor. A drain electrode of first MOSFET is coupled to a gate electrode of second MOSFET. The zero controlling capacitor is coupled between the gate electrode and source electrode of first MOSFET, and the zero controlling capacitor has a capacitance far larger than a parasitic capacitance between the gate electrode and the source electrode of first MOSFET to generate a pair of controllable transmission zeros under low-frequency operation.
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