When considering the noise and other distortions related to the analog input and common mode voltage node of ADC, ADC with switched capacitor input sampling network can also be used as a simple index. Figure 1 shows a typical ADC analog input with an integrated driver amplifier and anti aliasing filter (AAF). ADC analog input […]
Articles Tagged: amplifier
Power supply solution of Helmholtz coil
Zlgpsa series programmable AC power supply is a new power supply solution for Helmholtz coil, which continues the advantages of traditional [signal generator + amplifier] combined power supply, and has the advantages of more convenient operation experience, smaller footprint and lower cost. Helmholtz coil is composed of a pair of identical circular conductor coils, which […]
Precise matching of high precision amplifier and ADC by resistor network with precise matching
Some ideal op amp configurations assume a perfect match of the feedback resistors. In fact, the non ideality of the resistor will affect various circuit parameters, such as common mode rejection ratio (CMRR), harmonic distortion and stability. As shown in the example in Figure 1, a good CMRR is required to configure a single ended […]
Application of PWM technology in class D power amplifier
1. Introduction Audio power amplifier can be divided into four categories Class A、Class B、Class AB、Class D. Class A is a complete linear amplifier. Using a single transistor amplification, the heating is large, the efficiency is low, but the distortion rate is very low. Class B, also known as linear amplifier, uses two transistors to linearly […]
Using switched capacitor amplifier circuit to realize correlated double sampling CDs function application
There is a shared column output on each pixel in the same column of APS pixel array, as shown in the figure. The shared output of each column of pixels is processed and amplified through a column analog signal channel. In this channel, there is a constant current source biased by the analog voltage VB, […]
Connection method and precautions of tpa6132a2 forward single ended amplifier
Tpa6132a2 provided by Ti is widely used in mobile devices such as mobile phones because of its high signal-to-noise ratio of 100dB, low distortion of 0.01%, excellent ability to eliminate pop sound and high cost performance. Due to the improvement of the integration of mobile device chips, more and more chipsets choose the single ended […]
Frequency characteristic measurement based on amp328 audio amplifier
Measuring the frequency characteristics (including amplitude frequency characteristics and phase frequency characteristics) of circuit systems, such as amplifiers, is an important part of circuit measurement. There are several ways to measure the frequency characteristics of a circuit Frequency sweep method White noise injection method Unit impulse response of measurement system In this paper, we use […]
Design and implementation of low distortion and high efficiency audio amplifier
Class D amplifier (digital audio power) is a kind of analog audio signal or PCM digital information input into PWM (pulse width modulation) or PDM (pulse density modulation) pulse signal, and then use PWM pulse signal to control high power switching device on / off audio power amplifier. Class D amplifiers or digital amplifiers are […]
Analog electronics knowledge: the effect of negative feedback on amplifier performance
If the input end of the amplifier is assumed to be short circuited (UI = 0), the voltage of R4 from uo can still act on the input end of the amplifier, that is, the feedback does not disappear, so it is series feedback. If the load is short circuited, the R4 voltage becomes 0 […]
What are the design methods of WiFi RF circuit
This article is written by me combined with many years of work experience and practice, which has a certain practicality. I hope it can help you in your design work. 1. Preface This is a highly targeted technical article. In this article, I just analyzed the general RF circuit design of Wi Fi products, and […]