Hello everyone, today we are going to talk about ADS1115 communication with Zynq system development environment. Firstly, in the big picture, we will implement the i2c communication for communicate with ADS1115. Then, we send the data to the Zynq PS section. The reason behind this is because in the Zynq…

Today, we are going to talk about bandpass filter. The roles of bandpass filter is to emphasize the interval of frequency. It meas that it will emphasize the signal which its frequency are locate between f_low and f_high. To build bandpass filter, we use the lowpass and highpass filter concatenate…

Today, we are going to talk about high pass filter which mean it will attenuate low frequency and let high frequency pass. Sometimes, it uses to emphasize the high frequency. Firstly, let’s look at the transfer function of the high pass filter. Here, we introduce you to the first order high pass filter and the example are shown as follow. This transfer function can be plot as frequency response and phase response.

The code for plot this transfer function is here.

Now, we are going to simulate this circuit using LTspice with AC analysis.

In this week, we are going to talk about filter in terms of circuit theory. The roles of filter mainly are change frequencies or phase component of the input signal. Normally, it use to emphasize the signal with interested frequency. So, filter are the device that play with the spectrum…

Trivially, the oscillators is use when you want to generate some periodic signal. Here the astable oscillators can generate the square wave depend on the RC negative feedback circuit. Let remind the schmitt trigger circuit, which we have positive and negative threshold. It will be the maximum charge and discharge…

In the previous chapter, we talk about the comparator circuit with only one threshold. Let’s consider this scenario, if we have noisy signal with our circuit, what the output will be. Look at the figure below, the output will be oscillate follow by the input signal. This should not happen…

First of all, trivially, the comparator circuit is the circuit that compare 2 signals. It will tell you which signal is larger in terms of amplitude. The example of comparator circuit is found with the automatic system or the detection system. To understand this clearly, the math model is written…

Chanon Khongprasongsiri

Electronics Engineer and Master Student at King Mongkut’s University of Technology Thonburi.

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