Inter-channel interference and DC drift automatic subtraction circuit
A circuit and channel technology, applied in the field of inter-channel interference and DC drift automatic deduction circuit, can solve problems such as mutual interference of signal channels, and achieve the effect of ensuring synchronization, reducing signal distortion, and requiring no debugging.
Active Publication Date: 2018-03-30
BEIJING HAIGUANG INSTR
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Problems solved by technology
[0003] In order to solve the above technical problems, the present invention provides an automatic deduction circuit for inter-channel interference and DC drift, which solves the problem of DC interference in signal detection and mutual interference between signal channels during multi-channel measurement
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[0010] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0011] see figure 1 As shown, the inter-channel interference and DC drift automatic deduction circuit is composed of three operational amplifiers, a signal generator, a logic combination unit, an integrating capacitor and four resistors. The three operational amplifiers are respectively the first operational amplifier 1, The second operational amplifier 2 and the third operational amplifier 3, the first operational amplifier 1, the second operational amplifier 2 and the third operational amplifier 3 are connected in series successively, and the four resistors are respectively the first resistor 8, the second resistor 9, the third resistor Resistor 10 and fourth resistor 11, the first resistor 8 is connected in series between the first operational amplifier 1 and the second operational amplifier 2, the sec...
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The invention relates to the field of signal detection channels of analytical instruments, in particular to a circuit for effectively deducting direct current interference in signal detection and mutual interference and direct current drift automatic deduction between signal channels during multi-channel measurement. The circuit is composed of three operational amplifiers. , a signal generator, a logic combination unit, an integrating capacitor and a plurality of resistors, the input end of the first operational amplifier is connected to the output end of the photodetector of the spectrometer, and a second operational amplifier is connected in series with the third operational amplifier. Program-controlled switch, the integrating capacitor is connected in parallel with the third operational amplifier, and the third operational amplifier is an integrator. When the program-controlled switch is turned on, the output of the second operational amplifier keeps the signal on the integrating capacitor through the third operational amplifier and applies it to the integrator. The reverse terminal of the first operational amplifier realizes negative feedback. The design of the automatic deduction circuit for inter-channel interference and DC drift of the present invention does not use a DC blocking capacitor, thereby effectively reducing signal distortion.
Description
technical field [0001] The invention relates to the field of signal detection channels of analytical instruments, in particular to an automatic subtraction circuit for inter-channel interference and DC drift. Background technique [0002] In analytical instruments, in order to improve work efficiency, it is necessary to realize simultaneous detection of multiple elements in the design, which can significantly improve work efficiency, but in the design of signal detection circuits, the usual practice is to share a photodetector and preamplifier, Then, the measurement signals of each element are separated by the demodulation signal, and the analog-to-digital conversion is performed sequentially. There is a problem with this multi-channel measurement technology, that is, when the signal strengths of different channels are very different, the large signal will affect the small ones. There is an influence on the signal, which is the problem of inter-channel interference, especial...
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IPC IPC(8): H03K17/94
Inventor 李明章杜江孙鹏闫京山
Owner BEIJING HAIGUANG INSTR