Digital step attenuator utilizing thermometer encoded multi-bit attenuator stages
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United States of America Patent
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Aug 4, 2015
Grant Date -
Feb 21, 2013
app pub date -
Aug 17, 2012
filing date -
Aug 17, 2011
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Abstract
A digital step attenuator with thermometer encoded attenuator stages is disclosed. In one embodiment, Embodiments disclosed in the detailed description may include a digital step attenuator, programmable thermometer encoded attenuator stages, the digital step attenuator may include a cascade of programmable thermometer encoded attenuator stages. Each stage may be provided by a programmable impedance array including a plurality of impedances arranged in parallel. The impedance of each of the plurality of each stage may change monotonically by switchably inserting or removing one of the plurality of impedances in the arrays. The control circuit may govern the attenuation level of each of the thermometer encoded accumulator stages as a function of a thermometric codeword, which controls the switches in the arrays.
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