Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2007-03-06
2007-03-06
Urban, Edward F. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S318000, C455S317000, C455S258000, C327S100000, C327S119000, C375S284000, C375S296000
Reexamination Certificate
active
10811584
ABSTRACT:
A circuit provides a reduced harmonic content output signal OUTA and/or OUTB that is modulated according to an input signal231. The circuit has an oscillator circuit210and a harmonic rejection mixer (HRM)230. The oscillator circuit210includes at least one “circuit portion” (FIG.2A) configured to receive first and second orthogonal oscillator input signals (two of I, I−, Q, Q−) having respective first and second phases, and to provide an arbitrarily large number of oscillator output signals (φM) having respective mutually distinct phases that are interpolated between the first and second phases. Harmonic rejection mixer230is configured to use the input signal to modulate a combination of the oscillator output signals, the oscillator output signals being respectively weighted so as to provide an emulated sinusoidal signal constituting the reduced harmonic content output signal.
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Gharpurey Ranjit
Lin Heng-Chih
Brady W. James
Chow Charles
Shaw Steven A.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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