FET mixer having transmission line transformer
Patent 5361409 Issued on November 1, 1994. Estimated Expiration Date: 
January 14, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 14, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMonolithic microwave integrated circuit broadband mixer High frequency broad-band mixing circuit including an electrolytic capacitor in parallel with a local oscillator input port Monolithic double balanced mixer with high third order intercept point employing an active distributed balun Double-balanced high level wide band RF mixer Patent #: 5280648 InventorAssigneeApplicationNo. 004234 filed on 01/14/1993US Classes:455/326, With balanced mixer327/113, Frequency or repetition rate conversion or control333/119, Using transformer coil455/333Transistor or integrated circuitExaminersPrimary: Urban, Edward F.Attorney, Agent or FirmInternational ClassH04B 001/26AbstractA mixer comprising four FET transistors in a MMIC, a reflection transformer having tri-filar windings, an IF balun, an RF balun, a local oscillator balun, a pair of load resistors, a pair of series resistors, and a pair of series capacitors. The mixer is packaged in a lidded header similar to a large TO-8 metal package.Field of SearchParticular frequency conversion structure or circuitryWith balanced mixer Stripline With nonlinear impedance (e.g., diode) Transformer or other passive inductance Push-pull Transistor or integrated circuit COUPLING NETWORKS LONG LINE ELEMENTS AND COMPONENTS Strip type Balanced to unbalanced circuits Having long line elements Including hybrid-type network Using transformer coil | |
