National Semiconductor Germany Ag

Xignal Technologies Ag

Intel Corporation

Gerhard Mitteregger

Christian Ebner

Zdravko Boos

Ashkan Naeini

An apparatus for generating base band receive signals includes a first analog-to-digital converter module generating a first digital high frequency receive signal at least by sampling a first analog high frequency receive signal, a first digital signal processing module generating a first base band receive signal based on the first digital high frequency receive signal, a second analog-to-digital converter module generating a second digital high frequency receive signal at least by sampling a second analog high frequency receive signal and a second digital signal processing module generating a second base band receive signal based on the second digital high frequency receive signal. The first analog high frequency receive signal comprises first payload data at a first receive channel associated with a first carrier frequency and the second analog high frequency receive signal comprises second payload data at a second receive channel associated with a second carrier frequency.

Apparatus and method for generating base band receive signals

A continuous-time delta-sigma analog digital converter for converting an analog input signal to a digital output signal, comprising an analog filter with at least one integration capacitor, a cycled quantifier which quantifies the filtered analog signal for generating the digital output signal, and a feedback device with at least one digital analog converter, which supplies at least a first analog feedback signal to the analog filter corresponding to the value of the digital output signal. The feedback device for generating a second feedback signal corresponding to the differentiated output signal of the quantifier, comprises a switching device coupled capacitively to the integration capacitor, by means of which device corresponding charge portions are transmitted to the integration capacitor when there is a variation in the digital output signal.

Continuous-time delta-sigma analog digital converter

The invention relates to a continuous-time delta-sigma analog digital converter () for converting an analog input signal (IN) to a digital output signal (OUT), comprising an analog filter (), which filters the analog input signal, a quantifier () cycled by a clock signal (CLK), which quantifier quantifies the filtered analog signal transmitted by the analog filter () to generate the digital output signal, and a feedback device () with at last one digital analog converter, which transmits at least one analog feedback signal based on the digital output signal (OUT) to the analog filter (). To simplify the feedback without adversely affecting the converter stability and power consumption, provision is made, according to the invention, for the feedback device () for generating a feedback signal corresponding to the differentiated output signal of the quantifier, to comprise two digital analog converters (--) to which the digital output signal (OUT) of the quantifier () is transmitted via a delay stage (--) with different delays, and hose analog output signals are transmitted to an analog subtractor (-).

The invention concerns a time-continuous delta-sigma analog-digital converter for the conversion of an analog input signal into a digital output signal, comprising an analog filter for the filtering of the analog input signal, a clocked operated quantiser, which contains at least one comparator () and which quantises the filtered analog signal outputted through the analog filter for the generation of 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. According to the invention a calibration device () linked with the quantiser is stipulated, which is designed to determine at a predetermined point in time an offset error of the comparator () and subsequently to compensate for this (Itrim).

Delta-sigma analog digital converter with offset compensation

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 (gm) and parallel to this a second amplifier path (gm, gm), wherein the transit frequency of the second amplifier path (gm, gm) is lower than the transit frequency of the first amplifier path (gm).

Continuous-time delta-sigma analog digital converter having operational amplifiers

The invention relates to an integrated circuit arrangement with an active filter comprising transconductance stages, each being adjustable by means of a bias current to be supplied, and comprising a tuning device for tuning the filter, which tuning device adjusts the bias currents of the transconductance stages, wherein the tuning device adjusts the bias current of a first transconductance stage, for the purpose of achieving a desired characteristic of this transconductance stage, and adjusts the bias current of at least one further transconductance stage such that the transconductance of this further transconductance stage deviates from the transconductance of the first transconductance stage by a certain value.

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Taufkirchen, Germany

Gerhard Mitteregger