High gain balanced mixer
Patent 4449245 Issued on May 15, 1984. Estimated Expiration Date: 
March 22, 2002. 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.
March 22, 2002. 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 References 2760061 3383601 3469212 3727078 Integrated circuit, image and sum enhanced balanced mixer Broad-band passive ring mixer Patent #: 4317230 InventorApplicationNo. 06/360511 filed on 03/22/1982US Classes:455/319, With particular coupling455/317, Unwanted oscillation or radiation prevention455/326, With balanced mixer455/332, Push-pull455/333Transistor or integrated circuitExaminersPrimary: Ng, Jin F.Attorney, Agent or FirmInternational ClassesH03D 7/14 (20060101)H03D 7/12 (20060101) H03D 7/00 (20060101) AbstractAn improved active balanced mixer for developing an IF signal by combining an RF signal and a local oscillator signal while providing high conversion gain. The mixer utilizes a series resonant circuit resonant at the IF frequency to reduce degenerative feedback effects at the IF frequency, thereby increasing conversion gain. Circuit is particularly adapted for a receiver in which the received RF signal is relatively close to the receivers IF frequency.Other References
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