A current dac circuit and method for outputting current
A circuit and current technology, which is applied in the field of configurable linear or exponential current DAC circuit and output current, can solve the problems that cannot realize the conversion or selection of exponential current and linear current
Active Publication Date: 2021-07-09
SHANGHAI AWINIC TECH CO LTD
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Problems solved by technology
[0006] Although the exponential current is realized in the above scheme, the conversion or selection between the exponential current and the linear current cannot be realized
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[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0061] see figure 1 , figure 1 A current DAC circuit provided for an embodiment of the present application, the current DAC circuit includes:
[0062] The linear DAC circuit 100 and the exponential current generating circuit 300, specifically:
[0063] The linear DAC circuit 100 is used to obtain the first linear analog current signal and the second linear analog current signal after the digital code input to the linear DAC circuit 100 is subjected to linear...
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A current DAC circuit and a method for outputting current. The linear DAC circuit of the circuit is based on the obtained index reference current and linear reference current, and the digital code input to the linear DAC circuit is linearly digital-to-analog converted to obtain the first linear analog The current signal and the second linear analog current signal, the exponential current generation circuit generates and outputs an exponential current based on the first linear analog current signal and the preset minimum expected output current, and uses the exponential current as the output signal of the current DAC circuit, or, linear The DAC circuit directly uses the second linear analog current signal as the output signal of the current DAC circuit. Users can choose the output signal of the linear DAC circuit according to their own needs, realizing the self-selection of whether the current DAC circuit outputs exponential current or output linear current, and realizes the current Whether the DAC circuit outputs exponential current or outputs linear current is self-selected.
Description
technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a method for configuring a linear or exponential current DAC circuit and an output current. Background technique [0002] In recent years, with the development of science and technology and the improvement of people's living standards, digital products have been widely used. The screens of digital products mostly use LCD screens, and the brightness control of the LCD is regulated by the backlight LED driver chip. Since the human eye's perception of light is in the form of a logarithmic curve, it is more sensitive at low brightness, and less sensitive at higher brightness. Therefore, the exponential form of the LED current regulation curve will make the human eye's perception of light closer to linear, the experience is more comfortable, and it protects the health of the user's eyes. Therefore, more and more mainstream high-end LED driver chips adopt and support user-...
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IPC IPC(8): G09G3/34G05F1/56
CPCG05F1/56
Inventor 许泽华孔庆河卢伟鹏程剑涛杜黎明孙洪军乔永庆
Owner SHANGHAI AWINIC TECH CO LTD