Patent ID: 6225859
Filing Date: 2001-05-01
Classification: H03H

Abstract:
An integrated low-pass filter, comprising:a filter input terminal;a transistor having a control terminal, an output terminal, a transistor terminal, and a source impedance;a resistor connected between said input terminal and said control terminal of said transistor;a first capacitor connected between said resistor and said control terminal of said transistor on one hand and to said output terminal of said transistor on the other hand;a filter output terminal connected to said output terminal of said transistor;a second capacitor connected between said filter output terminal and a first reference potential; andan adjustable current source connected between said filter output terminal and the first reference potential, said transistor terminal of said transistor being connected to a second reference potential, said source impedance defined by the equation: ##EQU3##where:R.sub.1 =resistance of said resistor;.beta.=differential current amplification;C.sub.1 =capacitance of said first capacitor;V.sub.T =temperature voltage; andI.sub.C =current generated by said adjustable current source.