Tuner capable of reducing power consumption and heat generation
AssigneeSharp Kabushiki Kaisha
InventorSyuuji Matsuura
Life of this patent
Estimating the term…
Abstract
There is provided a tuner capable of improving reliability thereof with reduced power consumption and reduced heat generation. In the tuner, one wideband amplifier circuit including one transistor constitutes a buffer amplifier. The wideband amplifier circuit is coupled with a first local oscillator circuit in a DC coupling style. With the above-mentioned arrangement, the buffer amplifier is allowed to have a simplified circuit construction and reduce noises. Since the amplifier circuit and the local oscillator circuit are coupled with each other in a DC coupling style, reduced power consumption can be achieved.
Claims5
A tuner having a local oscillator for outputting a local oscillation signal to a mixer, wherein
- a local oscillator comprises:
- a buffer amplification section constituted by an amplifier circuit having one amplification stage;
- and
- a local oscillation section coupled with the buffer amplifier in a direct current coupling style wherein the one amplification stage of said buffer amplification section consists of a first transistor having an emitter, and further wherein said local oscillation section includes a second transistor having a collector, said turner further comprising a connection branch connecting the emitter of the first transistor to the collector of the second transistor, thereby providing the direct current coupling.
Dependencies are inferred from the claim text.