Patent ID: 9590676
Date: 2017-03-07
CPC Classifications: H04B

Claim:
1. A signal receiving apparatus, comprising: an amplifying device, having an input terminal and an output terminal; an amplifying circuit, having an input terminal and an output terminal, wherein the input terminal of the amplifying circuit is coupled to the output terminal of the amplifying device; a feedback device, coupled between the output terminal of the amplifying circuit and the input terminal of the amplifying device; and a mixing device, having an input terminal coupled to a chip connecting port and an output terminal coupled to the input terminal of the amplifying device; wherein the mixing device is a passive mixer, the amplifying circuit is arranged to provide an input impedance looking into the input terminal of the amplifying circuit to fall within a first impedance range when the amplifying circuit operates in a first frequency range, the amplifying circuit is arranged to provide the input impedance looking into the input terminal of the amplifying circuit to fall within a second impedance range when the amplifying circuit operates in a second frequency range, the second frequency range is different from the first frequency range, and the second impedance range is different from the first impedance range.