Radio frequency ΣΔ-modulator

Details Radio frequency ΣΔ-modulator Radio frequency ΣΔ-modulator

2006-12-11

2009-10-20

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

Reexamination Certificate

active

07605733

ABSTRACT:
A radio-frequency ΣΔ-modulator comprises a first mixer in the forward path for down-converting the signals in this forward path with a local oscillator frequency and a second mixer in the feedback path for up-converting the feedback signal with the same local oscillator frequency. Delays between the two mixing operations cause a loss of gain in the loop of the ΣΔ-modulator. An adjustable amplifier in the feedback path compensates for this loss of gain.

REFERENCES:
patent: 5103228 (1992-04-01), Voorman et al.
patent: 6121910 (2000-09-01), Khoury et al.
patent: 6320529 (2001-11-01), Yasuda
patent: 2003/0080888 (2003-05-01), Muhammad et al.
patent: 2005/0179487 (2005-08-01), Lee et al.
patent: 2005002059 (2005-01-01), None

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