Pulse or digital communications – Receivers
Reexamination Certificate
2005-09-14
2009-06-02
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
C375S235000, C375S261000, C375S280000, C375S282000, C375S283000, C375S331000
Reexamination Certificate
active
07542521
ABSTRACT:
Provided is a direct-conversion frequency mixer for down converting a radio frequency (RF) signal into a baseband signal, in which a single phase RF signal and a quadrature location oscillation (quadrature LO) signal are used to generate the baseband signal, the frequency mixer comprising a first frequency mixing unit that uses quadrature LO signals having respective phases of 0 degrees and 180 degrees to directly down-convert the single phase RF signal into the in-phase baseband signal, and a second frequency mixing unit that uses quadrature LO signals having respective phases of 90 degrees and 270 degrees to directly down-convert the single phase RF signal into the quadrature-phase baseband signal, whereby drains and sources of the transistor for receiving the quadrature LO signal and the transistor for receiving the RF signal are connected in common, thus enabling low power source voltage driving.
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“An Si-SiGe BiCMOS Direct Conversion Mixer with Second-Order and Third-Order Nonlinearity Cancellation for WCDMA Applications,” Sheng et al, IEEE Transactions on Microwave Theory and Techniques, vol. 51, No. 11, Nov. 2003, pp. 2211-2220, © 2003 IEEE.
Choi Byoung Gun
Hyun Seok Bong
Lee Hee Tae
Park Chul Soon
Park Seong-Su
Electronics and Telecommunications Research Institute
Ladas & Parry LLP
Liu Shuwang
Timory Kabir A
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