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1. 发明专利

DE602004015617D1 未知
公开(公告)号：DE602004015617D1
公开(公告)日：2008-09-18
申请号：DE602004015617
申请日：2004-11-23
申请人： DIALOG SEMICONDUCTOR GMBH
发明人： ADLER ANDREAS , PESCHKE CARLO
IPC分类号： H05B44/00
摘要： Methods and systems to achieve linear and exponential control over a current to drive color LEDs have been achieved. Current digital-to-analog converters (IDAC) comprising each an exponential current digital-to analog converter and a linear IDAC, being cascaded to each other are used for a linear and an exponential control of a current driving a set of color LEDs, preferably RGB LEDs. The linear part of the IDAC, which is converting the mantissa of a floating-point number is used to control the color composition of the color LEDs. The exponential part of the IDAC, which is converting the exponent of the floating-point number is used to control the brightness of the color LEDs. While fading from one color to a next color a linear color change is required. The exponential part of the IDAC is used to dim the LEDs from bright to dark and vice versa. In order to get the visual perception of a linear dimming an exponential current change is required.

2. 发明专利

AT517672T 未知
公开(公告)号：AT517672T
公开(公告)日：2011-08-15
申请号：AT04368060
申请日：2004-08-17
申请人： DIALOG SEMICONDUCTOR GMBH
发明人： MAURER MICHAEL , ADLER ANDREAS
IPC分类号： A63J17/00 , H04M1/22 , H04M1/725 , H05B37/02
摘要： A communication device such as a cellular or wireless telephone handset has a light display, such as handset cover light or display backlight, synchronized to audio signals from multiple audio sources such as a microphone or AM/FM receiver. The communication device further includes an audio to illumination conversion apparatus for modulating the

3. 发明专利

AT511243T 未知
公开(公告)号：AT511243T
公开(公告)日：2011-06-15
申请号：AT04392040
申请日：2004-11-12
申请人： DIALOG SEMICONDUCTOR GMBH
发明人： ADLER ANDREAS , PESCHKE CARLO
IPC分类号： H03M1/66
摘要： Circuits and methods to convert a digital floating-point number into an analog current have been achieved. The conversion is performed directly by using an exponential current digital-to-analog converter (DAC) and a cascaded linear current digital-to-analog converter (DAC). The exponential current DAC is converting exponentially the exponent of the floating-point number, its output current is biasing the linear DAC, which is converting the mantissa of the floating-point number. The output current of the linear current DAC is correlates linearly with the value of the floating-point number. This technique is commutative, this means the sequence of the linear and the exponential converter can be interchanged. In this case the linear converter provides a biasing current to the exponential converter. The sign bit can be considered by converting the direction of the output current of the converter. This floating-point number conversion can handle a very high dynamic range and requires a minimum of chip space.

5. 发明专利

AT485633T 未知
公开(公告)号：AT485633T
公开(公告)日：2010-11-15
申请号：AT06392004
申请日：2006-03-20
申请人： DIALOG SEMICONDUCTOR GMBH
发明人： KILLAT DIRK , ADLER ANDREAS
IPC分类号： H03M3/02
摘要： Circuits and methods for eliminating charge errors caused by parasitic capacitances of delta sigma modulators, which comprises - provide in a modulation stage a first switching means for both positive and negative connections between an output of a differential Gm integrator and a correspondent integration capacitor and two buffer amplifiers in series with a second switching means wherein a first buffer amplifier is parallel to said positive connection and a second buffer amplifier is parallel to said negative connection; - open said first switching means and close said second switching means a short period of time before the chopper at the output of said Gm integrator switches; - precharge output nodes of the Gm integrator using said buffer amplifiers tracking the voltage on the capacitor nodes; and - close said first switching means and open said second switching means.

6. 发明专利

AT404036T 未知
公开(公告)号：AT404036T
公开(公告)日：2008-08-15
申请号：AT04392045
申请日：2004-11-23
申请人： DIALOG SEMICONDUCTOR GMBH
发明人： ADLER ANDREAS , PESCHKE CARLO
IPC分类号： H05B44/00
摘要： Methods and systems to achieve linear and exponential control over a current to drive color LEDs have been achieved. Current digital-to-analog converters (IDAC) comprising each an exponential current digital-to analog converter and a linear IDAC, being cascaded to each other are used for a linear and an exponential control of a current driving a set of color LEDs, preferably RGB LEDs. The linear part of the IDAC, which is converting the mantissa of a floating-point number is used to control the color composition of the color LEDs. The exponential part of the IDAC, which is converting the exponent of the floating-point number is used to control the brightness of the color LEDs. While fading from one color to a next color a linear color change is required. The exponential part of the IDAC is used to dim the LEDs from bright to dark and vice versa. In order to get the visual perception of a linear dimming an exponential current change is required.

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