Local oscillating circuit for receiving high-band and low-band signal
AssigneeAlps Electric Co., Ltd.
InventorMasaki Yamamoto
Life of this patent
Estimating the term…
Abstract
A local oscillating circuit includes an integrated circuit that has an oscillating transistor, protection diodes against electrostatic damage, and first and second terminals each being connected to a base and a collector of the oscillating transistor, cathodes of the protection diodes being respectively connected to the first and second terminals and anodes thereof being connected to a ground; and a resonating circuit that is provided outside the integrated circuit and is connected between the first and second terminals. A reverse-biasing voltage is applied to each of the cathodes of the protection diodes when VHF high-band signals are received while a voltage is not applied to each of the cathodes when VHF low-band signals are received.
Claims4
A local oscillating circuit comprising:
- an integrated circuit that includes an oscillating transistor, protection diodes against electrostatic damage, and first and second terminals each being connected to a base and a collector of the oscillating transistor, cathodes of the protection diodes being respectively connected to the first and second terminals and anodes thereof being connected to a ground;
- and
- a resonating circuit that is provided outside the integrated circuit and is connected between the first and second terminals,
- wherein a reverse-biasing voltage is applied to each of the cathodes of the protection diodes when VHF high-band signals are received while a voltage is not applied to each of the cathodes when VHF low-band signals are received.
Dependencies are inferred from the claim text.