Jonathan Scott Hacker

US Patent:

7423490, Sep 9, 2008

Filed:

Mar 31, 2006

Appl. No.:

11/395827

Inventors:

Yin Tat Ma - Diamond Bar CA, US
Jonathan Bruce Hacker - Thousand Oaks CA, US

Assignee:

Rockwell Scientific Licensing, LLC - Thousand Oaks CA

International Classification:

H03F 3/191

US Classification:

330297, 330306, 333181

Abstract:

An n-stage RF choke comprises a series connection of two or more inductors connected in series between a source and a load. The inductor closest to the source has the largest inductance and the inductance closest to the load has the smallest inductance. The inductances of any inductors between the inductor closest to the supply and the inductor closest to the load decrease as a function of distance from the supply. The junctions between the inductors in the series connection are shunted to ground by capacitors connected in series with resistors that provide a matched termination for increasing bandwidth by lowering circuit Q factors and eliminating resonant frequencies. The capacitor closest to the supply has the largest capacitance and the capacitor closest to the load has the smallest capacitance. Any intermediate capacitors decrease in capacitance as a function of distance from the supply. Such an arrangement provides a high impedance that isolates the load from the supply at a wide range of frequencies.