Title：Down-converter using an on-chip bias circuit for enhancing symmetry and linearity and testing device thereof
Country：USA
Patent No.：US7049878 B2
Legal Status：Authorized
Inventor：Bingxue Shi, Baoyong Chi
Assignee：Winbond Electronics Corp.
Address：
Filing Date：2004-06-03
Issue Date：2006-05-23
Abstract：
A down-converter and a testing device for the down-converter are provided. The down-converter implements a Class-AB single-end input, differential output double balanced mixer structure. By introducing an on-chip bias loop, it significantly improves the symmetry and linearity of the mixer. The down-converter on-chip implements an input impedance match circuit and an open-drain output stage. By optimizing the circuit structure and each device, it achieves the objectives of a high conversion gain, high linearity, and low noise coefficient.
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