Doubly-balanced mixer termination
Patent 4601063 Issued on July 15, 1986. Estimated Expiration Date: 
February 28, 2005. 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.
February 28, 2005. 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.InventorAssigneeApplicationNo. 06/705499 filed on 02/28/1985US Classes:455/317, Unwanted oscillation or radiation prevention455/326, With balanced mixer455/330, With nonlinear impedance (e.g., diode)455/338Coupling or decoupling between stagesExaminersPrimary: Bookbinder, Marc E.Assistant: Telesz, Andrew Attorney, Agent or FirmInternational ClassH03D 7/14 (20060101)AbstractThe output of a doubly-balanced mixer of a television tuner is terminated by a network which exhibits the characteristic impedance of the mixer for both the sum and difference frequency components. The difference frequency component termination simply consists of an inductor and a capacitor connected as a series-tuned circuit and a resistive element connected in series between the output of the mixer and signal ground. The inductor and capacitor are selected resonate at a frequency in the passband of the IF section and the resistive element is selected to exhibit the characteristic impedance of the mixer. The sum frequency component termination simply consists of a capacitor and a resistive element connected in series between the output of the mixer and signal ground. The capacitor is selected to exhibit negligible impedance just below the lowest frequency of the sum frequency component and the resistive element is selected to exhibit the characteristic impedance of the mixer.Other References
Field of SearchImage frequency suppressionUnwanted oscillation or radiation prevention With balanced mixer With nonlinear impedance (e.g., diode) Push-pull Transistor or integrated circuit Particular frequency conversion structure or circuitry Including distributed electrical parameter structure Coupling or decoupling between stages Band pass filter In radio frequency amplifier, intermediate frequency amplifier or converter circuit | |
