Jason Robert May

US Patent:

20120256709, Oct 11, 2012

Filed:

Apr 6, 2012

Appl. No.:

13/441730

Inventors:

Donald A. Hitko - Grover Beach CA, US
Carson R. White - Agoura Hills CA, US
Michael W. Yung - Los Angeles CA, US
David S. Matthews - Oxnard CA, US
Susan L. Morton - Pittsford NY, US
Jason W. May - Santa Monica CA, US
Joseph S. Colburn - Malibu CA, US

Assignee:

HRL LABORATORIES, LLC - Malibu CA

International Classification:

H03H 11/44

US Classification:

333216

Abstract:

A differential circuit topology that produces a tunable floating negative inductance, negative capacitance, negative resistance/conductance, or a combination of the three. These circuits are commonly referred to as “non-Foster circuits.” The disclosed embodiments of the circuits comprises two differential pairs of transistors that are cross-coupled, a load immittance, multiple current sources, two Common-Mode FeedBack (CMFB) networks, at least one tunable (variable) resistance, and two terminals across which the desired immittance is present. The disclosed embodiments of the circuits may be configured as either a Negative Impedance Inverter (NII) or a Negative Impedance Converter (NIC) and as either Open-Circuit-Stable (OCS) and Short-Circuit-Stable (SCS).