Single side band transmitter having reduced DC offset

Details Single side band transmitter having reduced DC offset Single side band transmitter having reduced DC offset

2006-09-05

2006-09-05

Urban, Edward F. (Department: 2685)

Telecommunications

Transmitter

Plural modulation

C455S118000, C455S091000, C455S114100, C375S270000, C375S296000, C375S301000, C332S159000

Reexamination Certificate

active

07103327

ABSTRACT:
A single side band transmitter having reduced DC offset includes a current source modulation module, a current mirror module, a 1stmixing module, a 2ndmixing module, a summing module, and a power amplifier. The current source module is operably coupled to modulate, in accordance with a modulation protocol (e.g., FSK) data to produce an in-phase current component and a quadrature current component. The current mirror module is operably coupled to mirror the in-phase current component to produce a mirrored in-phase current component and is also operably coupled to mirror the quadrature current component to produce a mirrored quadrature current component. The 1stmixing module is operably coupled to mix the mirrored in-phase current component with an in-phase current component of a local oscillation to produce a 1stmixed current signal. The 2ndmixing module is operably coupled to mix the mirrored quadrature current component with a quadrature component of the local oscillation to produce a 2ndmixed current signal. The summing module is operably coupled to sum the 1stand 2ndmixed current signals to produce an up converted signal. The power amplifier amplifies the up converted signal prior to transmission as a radio frequency signal.

REFERENCES:
patent: 6078628 (2000-06-01), Griffith et al.
patent: 6115428 (2000-09-01), Kim
patent: 6615027 (2003-09-01), Sahota et al.
patent: 6658065 (2003-12-01), Della Torre et al.
patent: 6731693 (2004-05-01), Damgaard
patent: 2004/0102170 (2004-05-01), Jensen et al.

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