Abstract: The invention provides a signal isolation and transmission device, comprising a high-frequency amplitude modulation circuit, a signal demodulation circuit, a first H-field antenna and a second H-field antenna. The first H-field antenna and second H-field antenna are both loop antennas with an external conductive shielding layer, and an insulating layer is wrapped outside the conductive shielding layer. The annular parts of the first H-field antenna and second H-field antenna face and abut each other. The high-frequency amplitude modulation circuit is connected with a pin of the first H-field antenna, and a pin of the second H-field antenna is connected with the signal demodulation circuit. The signal to be tested is modulated onto a high-frequency carrier signal by the high-frequency amplitude modulation circuit, and then isolated and transmitted by the two H-field antennas, which greatly improves the anti-interference effect, reduces the attenuation degree and improves the coupling degree of the signals.

Abstract: The application provides an attenuator and a differential voltage probe, comprising a forward attenuation circuit and a reverse attenuation circuit which are symmetrical with each other, a first compensation unit and a third compensation unit which are symmetrical with each other, a second compensation unit and a fourth compensation unit which are symmetrical with each other, and a differential amplifier; the four compensation units are all adjustable capacitor units composed of constant capacitance; a positive-going signal to be tested is attenuated by the forward attenuation circuit, and frequency characteristics of a preset frequency point are adjusted by the first compensation unit and second compensation unit; a negative-going signal to be tested is attenuated by the reverse attenuation circuit, and frequency characteristics of a preset frequency point are adjusted by the third compensation unit and fourth compensation unit; finally, the difference value is calculated by the differential amplifier, ampli