Multipath linear isolation circuit and oscilloscope thereof
A linear isolation circuit, isolation circuit technology, applied in the direction of voltage/current isolation, instrumentation, measurement of electrical variables, etc., can solve the problems of low-frequency path circuit complexity, inability to function, delay compensation circuit ineffective, etc., to achieve winding Convenience, convenient debugging, simple frequency compensation circuit
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Embodiment 1
[0104] Figure 8 It is a schematic diagram of the structure of this embodiment. This embodiment is applicable to the application of single-ended signal input and single-ended signal output.
[0105] In this embodiment, the low-frequency amplifier circuit uses R and C low-pass filters, and an amplifier follower circuit. The resistance and capacitance determine the bandwidth of the low-frequency amplifier circuit, which needs to meet the bandwidth of the linear optocoupler circuit. The resistor is 10kΩ, the capacitor is 1.5nF, and the bandwidth of the low-frequency amplifier circuit is 10kHz. The amplifier can use any high-precision amplifier to meet the requirements for low-frequency sampling accuracy. Of course, the selection of better amplifiers such as precision, low noise, low distortion, low bias current, and low-temperature drift can be beneficial to the low-frequency high-precision technical effect. accomplish. For example, choose AD823 and AD8639 of ADI Company.
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Embodiment 2
[0126] Figure 9 It is a schematic diagram of the structure of this embodiment. This embodiment is applicable to the application of single-ended signal input and differential signal output.
[0127] The difference between this embodiment and Embodiment 1 is that the high-frequency subtraction circuit uses a fully differential operational amplifier with differential output to drive the primary coil of the high-frequency transformer. The fully differential operational amplifier can choose ADA4927 of ADI Company or LMH6552 and LMH6554 of TI Company.
[0128] Correspondingly, the adding circuit also uses a fully differential amplifier, and the same amplifier as the high-frequency subtractor can be selected to form a proportional adding circuit. The two output terminals of the secondary coil of the high-frequency transformer are connected to the two input terminals of the full differential amplifier of the adding circuit, and the eight resistors of the adding circuit are selected...
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