Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2008-04-29
2008-04-29
Nguyen, Khai M. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S155000, C341S159000, C327S552000, C327S553000, C327S558000, C327S559000
Reexamination Certificate
active
11656057
ABSTRACT:
The invention concerns a continuous-time delta-sigma analog-digital converter for the conversion of an analog input signal into a digital output signal, comprising an analog filter which filters the analog input signal and at least one externally circuited operational amplifier (OPAMP) for the formation of an integrator stage, a clock-driven quantizer, which quantizes the filtered analog signal outputted through the analog filter to generate the digital output signal, and a feedback arrangement with at least one digital-analog converter, which supplies to the analog filter at least one feedback signal on the basis of the digital output signal. For the reduction of the necessary amplification-bandwidth product for the operational amplifier (OPAMP) it is stipulated according to the invention that the operational amplifier (OPAMP) has a first amplifier path (gm3) and parallel to this a second amplifier path (gm2, gm5), wherein the transit frequency of the second amplifier path (gm2, gm5) is lower than the transit frequency of the first amplifier path (gm3).
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National Semiconductor Germany AG
Nguyen Khai M.
Pearne & Gordon LLP
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