Wide band digital to analog converters and methods,...

Details Wide band digital to analog converters and methods,... Wide band digital to analog converters and methods,...

2005-12-20

2005-12-20

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S141000, C341S144000

Reexamination Certificate

active

06977602

ABSTRACT:
Wide band CMOS digital to analog converters (DACs), including converters with selectable impulse response, using multiple DAC cores. The DAC cores operate on the same data at the DAC clock rate, but staggered in phase. Switches are used to switch the later part of the output time of each DAC core to the DAC output, otherwise to a dummy load. Thus each DAC conversion is comprised of a later part of each DAC core conversion, at least the first part of each DAC core conversion being ignored to allow each DAC core to settle before utilizing its output. Since the same switches and switching sequence is used on each DAC data conversion, the effects of switch imbalances are negated. Various embodiments are disclosed, including manipulation of the input to one of the DAC cores to selectively provide an NRZ, RZ and an RF response.

REFERENCES:
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patent: 5689259 (1997-11-01), Ozguc
patent: 6639534 (2003-10-01), Khoini-Poorfard et al.
Park, Sungkyung et al., “A Digital-to-Analog Converter Based on Differential-Quad Switching”, IEEE Journal of Solid-State Circuits, Oct. 2002, pp. 1335-1338, vol. 37, No. 10.

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