US 11,874,305 B2
Attenuator and differential voltage probe
Xiaoming Fan, Guangdong (CN)
Assigned to SHENZHEN ZHIYONG ELECTRONICS CO., LTD., Shenzhen (CN)
Appl. No. 17/640,826
Filed by SHENZHEN ZHIYONG ELECTRONICS CO., LTD., Guangdong (CN)
PCT Filed Jul. 27, 2021, PCT No. PCT/CN2021/108542
§ 371(c)(1), (2) Date Mar. 6, 2022,
PCT Pub. No. WO2022/042172, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 202010868930.4 (CN), filed on Aug. 25, 2020.
Prior Publication US 2022/0341974 A1, Oct. 27, 2022
Int. Cl. G01R 19/10 (2006.01); H03H 7/24 (2006.01)
CPC G01R 19/10 (2013.01) [H03H 7/24 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An attenuator, 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;
a first end of the forward attenuation circuit is connected with a positive polarity of a signal to be tested, and a second end is connected with a non-inverting input of the differential amplifier, a third end is connected with a first end of the first compensation unit, and a fourth end is connected with a first end of the second compensation unit;
a first end of the reverse attenuation circuit is connected with a negative polarity of a signal to be tested, and a second end is connected with an inverting input of the differential amplifier, a third end is connected with a first end of the third compensation unit, and a fourth end is connected with a first end of the fourth compensation unit;
a fifth end of the forward attenuation circuit and a fifth end of the reverse attenuation circuit are commonly connected to a floating output;
second ends of the first compensation unit, the second compensation unit, the third compensation unit and the fourth compensation unit are respectively connected to a floating output;
the forward attenuation circuit is used to attenuate a positive-going signal to be tested, and adjust the frequency characteristics of a preset frequency point through the first compensation unit and the second compensation unit;
the reverse attenuation circuit is used to attenuate a negative-going signal to be tested, and adjust the frequency characteristics of a preset frequency point through the third compensation unit and the fourth compensation unit;
the differential amplifier is used for receiving the positive-going signal to be tested attenuated by the forward attenuation circuit and the negative-going signal to be tested attenuated by the reverse attenuation circuit, and amplifying and outputting a difference between the attenuated positive-going signal to be tested and negative-going signal to be tested according to a preset gain.