Pin shared analog front end processing device and method for sharing pin
A processing device, analog front-end technology, used in cathode ray tube indicators, instruments, static indicators, etc.
Active Publication Date: 2012-07-18
REALTEK SEMICON CORP
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Problems solved by technology
Since the signal range of the positive terminal signal of each channel is different, the target negative terminal voltage of each reference channel will also be different. Therefore, the pins of the negative terminal signals cannot be shared. There are several channels of positive terminal signals that require several channels of negative terminals. The foot position is not economical in terms of cost
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[0038] Please refer to figure 1 , figure 1 It is a schematic diagram of an embodiment of the present invention applied to an analog front-end processing device 110 of a display system. The DC potential reconstruction device can be applied to various differential signals, and the differential image signal applied to the display system is only one of the embodiments. The analog front-end processing device 110 is set in a display system chip 100. The display system chip 100 receives multiple pairs of differential image signals R, G, and B, and uses the AC coupling capacitor C to allow the AC component of the signal to enter the display from a printed circuit board 105. Inside the system chip 100 , each pair of differential image signals includes a positive terminal signal (ie R+, G+, B+) and a negative terminal signal (ie R−, G−, B−). The analog front-end processing device 110 is provided with a plurality of positive terminal pins 122, 124, 126, which are respectively used to...
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The invention relates to a pin shared analog front end processing device and a method for sharing a pin. The pin shared analog front end processing device comprises a plurality of positive terminal pins, a negative terminal pin, a plurality of positive terminal clamping circuits, a negative terminal clamping circuit, a plurality of sampling and holding circuits, and a plurality of alignment circuits. The positive terminal clamping circuits clamp each positive terminal signal to a corresponding target positive terminal voltage. The negative terminal clamping circuit clamps a negative terminal signal to a first reference voltage. Each sampling and holding circuit comprises a positive input terminal and a negative input terminal, and in a sampling period, the voltage difference between the two input terminals is that between the corresponding target positive terminal voltage and the first reference voltage; in a holding period, the voltage difference between the two input terminals is the voltage difference between the corresponding target negative terminal voltage and a second reference voltage.
Description
technical field [0001] The present invention relates to an analog front-end processing device with shared pins and a pin-sharing method thereof, in particular to an analog front-end processing device which fixes the direct current of all negative-end signals at a reference voltage and improves the internal sampling and holding circuit and method. Background technique [0002] Display system chips such as TVs and LCD screens usually include an analog front-end circuit for converting analog signals (such as R, G, B) into digital signals for display on the screen. In the application, the signal is usually single-ended (single-ended), and for noise considerations, the signal processing of the display system chip will use a differential signal (differential signal), so the received single-ended signal must be internally integrated into the chip converted to a differential signal. Since the DC potential of each signal is different, AC coupling techniques are usually used to all...
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IPC IPC(8): G09G5/00
Inventor 蔡瑞原陈正瑞
Owner REALTEK SEMICON CORP