Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2007-06-26
2007-06-26
Tran, Pablo N. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S150100, C455S180200, C455S189100, C455S192200
Reexamination Certificate
active
10319188
ABSTRACT:
A front end tuning system includes a tuning signal generator. The tuning signal generator includes a digital-to-analog converter (DAC) to receive a pre-conditioned tuning signal at a reference input, to receive a digital value at a digital control input, and to produce a modified tuning signal based on the digital value and the pre-conditioned signal. Preconditioning the tuning-voltage allows a simple current type DAC to be can be used, rather than an 8-bit ladder type DAC used by some other front end tuners. Significant cost savings can be achieved because less memory is required to store the digital values supplied to the DACs, and set up times can be reduced. An adjustable temperature compensation circuit provides additional adaptability.
REFERENCES:
patent: 4748683 (1988-05-01), Sato
patent: 4837852 (1989-06-01), Takada et al.
patent: 5280638 (1994-01-01), Porambo et al.
patent: 5428829 (1995-06-01), Osburn et al.
patent: 5678211 (1997-10-01), Badger
patent: 5701598 (1997-12-01), Atkinson
patent: 5991609 (1999-11-01), Marrah et al.
patent: 6157271 (2000-12-01), Black et al.
patent: 6178315 (2001-01-01), Sheikh-Movahhed et al.
patent: 6188970 (2001-02-01), Becker et al.
patent: 6243570 (2001-06-01), Kobayashi
patent: 6346899 (2002-02-01), Hadidi
patent: 6370368 (2002-04-01), Kianush
patent: 6424824 (2002-07-01), Stepp et al.
patent: 6842610 (2005-01-01), Maeda et al.
patent: 2004/0033794 (2004-02-01), Korden et al.
Freescale Semiconductors, Inc.
Tran Pablo N.
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