Image rejection mixer providing precision image rejection

Details Image rejection mixer providing precision image rejection Image rejection mixer providing precision image rejection

2008-05-06

2008-05-06

Maung, Nay (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S285000, C455S326000, C455S318000

Reexamination Certificate

active

11077629

ABSTRACT:
An image rejection mixer includes a first mixer, a second mixer, a first output adjust circuit, and a second output adjust circuit. The first mixer is coupled to receive an input RF signal and a local oscillator signal and includes a first mixer stage and a first output load stage. The second mixer is coupled to receive the input RF signal and a phase-converted local oscillator signal and includes a second mixer stage and a second output load stage. The first output adjust circuit is coupled to the first output load stage for modifying the signal waveform of a first output signal of the first mixer. The second output adjust circuit is coupled to the second output load stage for modifying the signal waveform of a second output signal of the second mixer. In this manner, the near-perfect image rejection result in the final IF signal can be obtained.

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patent: 6127962 (2000-10-01), Martinson
patent: 6226509 (2001-05-01), Mole et al.
patent: 2004/0004674 (2004-01-01), Birleson
International Search Report, 9 pages.

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