Frequency conversion apparatus
Patent 4677692 Issued on June 30, 1987. Estimated Expiration Date: 
June 27, 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.
June 27, 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.Patent References 3609556 Integrated front end circuit for VHF receiver Balanced modulator Transistor oscillator circuit Transistor mixer and amplifier input stage Patent #: 4480337 InventorsAssigneeApplicationNo. 06/749416 filed on 06/27/1985US Classes:455/319, With particular coupling455/323, Particular frequency conversion structure or circuitry455/326, With balanced mixer455/333, Transistor or integrated circuit455/343.1Having particular power or bias supply (including self-powered or battery saving means)ExaminersPrimary: Ng, Jin F.Attorney, Agent or FirmInternational ClassesH03D 7/14 (20060101)H03D 7/12 (20060101) H03D 7/00 (20060101) Foreign Application Priority Data1984-06-29 JPAbstractA frequency conversion apparatus for converting a high frequency signal into an intermediate frequency signal includes a mixer section for mixing a high frequency signal with a local oscillator signal so as to obtain an intermediate frequency signal, and an amplifier connected to the mixer section via a high frequency stopping circuit for supplying a constant direct current to the mixer section as a constant current source. A current flowing in the mixer section when the local oscillator signal is applied is kept substantially equal to a direct current flowing in the mixer section when no local oscillator signal is applied thereto. The amplifier is used for amplifying either the high frequency signal or the intermediate frequency signal, or both signals at the same time.Other References
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