Design of signal source based on stm32f103zet6 and ad9852dds

Aiming at the π – Network quartz crystal parameter test system, stm32f103zet6 arm is used as MCU to control DDS to generate excitation signal. Compared with the traditional PC test system, the test system has the advantages of simple equipment, convenient operation, rich resources and faster operation speed. AD9852 DDS can generate 0 ~ 100 […]

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The working principle and testing skills of LCR digital bridge

LCR digital bridge is an instrument used to measure inductance, capacitance and resistance parameters. It usually includes Z, y, θ, RS, RP, x, G, B, LS, LP, CS, CP, Q, D and other measurement items. Why measure impedance? Today’s Antai test will give you an introduction to LCR digital bridge What is impedance? In a […]

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Frequency tracking of ultrasonic scalpel based on impedance matching principle of ultrasonic transducer

Author: Yang Lin, Dai Jianfeng, Zhao Hucheng, Gao Zhan, Lu Yang, sun Xueming introduction Ultrasonic scalpel is also called ultrasonic cutting hemostatic knife. Its working principle is to convert electric energy into mechanical energy through ultrasonic transducer (piezoelectric ceramic). After amplification and focusing, it acts on human target tissue. Its working frequency is generally 20-100 […]

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Performance and application of Buck DC / DC converter lm2770 / 88 / 97 / 98

Lm2770, lm2788, lm2797 and lm2798 DC / DC converters, from 2.7V to 5.5V, can output current up to 250mA. The unique dynamic gain architecture provides efficiency up to 90%, which is similar to the traditional buck regulator that requires external inductors. Two kinds of micro packages are available. Four small ceramic capacitors and no external […]

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How to calculate the loss of power IC

In this paper, we will introduce an example of summarizing these losses and calculating them as power IC losses. Power loss calculation example of power supply IC (synchronous rectification IC with built-in MOSFET) The relevant parts are shown in the figure when considering the “loss of power IC”. This paper takes the MOSFET built-in IC […]

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Working principle of buck switching regulator in DC / DC conversion

Now the most widely used step-down switching regulator is taken as an example to illustrate the working principle. Figure 31 is a general circuit of step-down DC / DC conversion, which is converted into desired DC voltage by smoothing DC voltage Vin with inductor and capacitor after time division by switch. Figure 31 Figure 32 […]

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