USB power supply for portable devices, like its serial communication function, has become a standard application. Nowadays, USB power supply has been extended to battery charging, AC adapter and other forms of power supply applications. One of the remarkable effects of the popularity of applications is that the charging and power supply of portable devices […]
Category: Simulation Technique
How to compensate STC for current driven sensor?
This paper demonstrates how to determine the characteristics of ADC and silicon strain gauge when constructing a simple proportional circuit, and gives a simplified application circuit using current driven sensor. Background knowledge of silicon strain gauge The advantage of silicon strain gauge is its high sensitivity. The stress in silicon material causes the change of […]
Design and Simulation of small power amplifier
Characteristics of power amplifier circuit To provide enough output power to the load, namely voltage amplification and current amplification. push-pull circuit As shown in the figure below ！ [simple push pull circuit] It can be seen from the figure that in the positive half cycle of the input signal, vt1vt1 is on and vt2vt2 is […]
Improving linearity of a / D conversion by voltage time conversion method
In the data acquisition system which requires strict monotonic response, high resolution, low noise and moderate speed, designers like to use VFC (voltage frequency converter) for a / D conversion. VFC can generate a pulse train whose frequency is proportional to the input voltage. Then, the microcontroller or logic will set a fixed period of […]
Design scope and performance of isl55210 active balanced unbalanced transformer scheme
Although all fully differential amplifiers (FDA) can convert single ended input signal to differential output, none of them has shown enough performance to provide good input impedance matching without additional resistor grounding. If resistor grounding can be eliminated while still providing very wide band impedance matching, a fairly low noise implementation can be provided. In […]
Explanation and design scheme analysis of components in crystal oscillator circuit
This paper will discuss the crystal oscillator circuit design, and explain the specific role of each component in the circuit, and provide guidance on the selection of component values. Finally, some suggestions and measures are given to eliminate the instability and start-up of crystal oscillator. Equivalent electrical characteristics of 1 crystal oscillator (1) Concept [1] […]
What are the common AC performance characteristics of converters and what are their functions
In consumer, medical, automotive and even industrial fields, more and more electronic products use high-speed signal technology for data and voice communication, audio and imaging applications. Although the signals processed by these application categories have different bandwidths and different converter architectures, they share some common characteristics when comparing candidate ADCs and evaluating the performance of […]
Power decoupling circuit of analog circuit knowledge
Not only the minimum master control system needs to decouple the power supply, but all the systems with digital and analog circuits need to decouple the power supply. Power supply decouple, that is to say, the direct point is to introduce the noise voltage on the power supply to the ground plane, so that the […]
Analysis of amplifying circuit: equivalent circuit of transistor
The equivalent circuit of transistor Linearization of nonlinear devices Under the condition of small signal variation, linear circuit is used to describe the nonlinear characteristics of triode, which is called micro variation equivalent circuit. The input circuit of triode is equivalent to a dynamic resistance re According to the input characteristic curve to find the […]
What is the difference between operational amplifier and amplifier circuit? Circuit diagram of classic operational amplifier
1、 Introduction of operational amplifier Operational amplifier (OP AMP) is a circuit unit with high magnification. In the actual circuit, usually combined with the feedback network to form a functional module. It is a kind of amplifier with special coupling circuit and feedback. The output signal can be the result of the input signal addition, […]