Rockin’ Patent – “Electronic High-pass And Low-pass Filters”
Rockin’ Patent: US Patent No. US 3,475,623 A Filed: 10 October 1966 In the name of: Robert A. Moog Title: Electronic High-pass And Low-pass Filters Employing The Base To Emitter Diode Resistance Of Bipolar Transistors What’s claimed: “An RC filter comprising a plurality of capacitors connected to provide the capacity elements of the filter and a plurality of bipolar transistors connected with said capacitors to utilize the essentially exponential resistance of the base to emitter diodes of said transistors as voltage controllable resistance elements of the RC filter.” Why this patent (application) rocks: This patent describes the use of bipolar transistors arranged in a ladder […]
