Title: Mixer of direct-conversion RF receiver
Application Number: 200510096595 Application Date: 2005.08.25
Publication Number: 1731691 Publication Date: 2006.02.08
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04B1/16,H03D1/18
Applicant(s) Name: VIA Technologies, Inc. Address:
Inventor(s) Name: Zeng Yingzhe
Attorney & Agent: huang xiaolin wang zhisen
Abstract:
     Disclosed is a mixing device of a direct conversion radio frequency receiver, which comprises gain circuit, load circuit and conversion circuit. The gain circuit receives difference RF signals to generate first gain signal. The conversion circuit mixes the first gain signal and local oscillation signal for directly fall down frequency to generate modulating signal. The load circuit comprises a pair of first transistors, a pair of second transistors and a pair of resistance units. The resistance units provide gain parameters. The first transistors provide low resistance to make the modulation signal input into the load circuit. The second transistors provide high resistance to lead the modulation signal inputting to load circuit to the resistance units and output second gain signal that meets the gain parameters. The second transistors are one-direction npn bipolar transistor for exploiting metallic oxide semiconductor structures.
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