![]() Figure 5 is one such example where U1 and U2 TINA-TI macros respectively represent 4 th order 100MHz low-pass Butterworth and Chebyshev filters, driving identical LMH6554 single ended to differential amplifiers. You may also include any parasitics in your analysis. If you simulate the response using the filters’ Laplace transforms, and implement your FDA design, you can get the actual response at the ADC input, including any effects from interaction of stages with each other. You know that you will get a “smoother” response from a Butterworth filter, but a Chebyshev filter is bound to have a sharper skirt. Say you are contemplating the characteristics and the order of a filter you need in front of a fully differential amplifier (FDA), such as the 2.8GHz LMH6554, to drive a GSPS analog to digital converter (ADC), like the 12bit 1.6GSPS ADC12J1600, and you’d like to find out the overall response. ![]() This can be powerful in many simulation applications such as filters, electro-mechanical response, Laplace transform magnitude / phase visualization and many others. TINA-TI has the ability to generate and preform AC Analysis with any waveform / source that is described with a Laplace transform expression involving “s”. Figure 3 is an example of a waveform computed using Excel for a fast exponential rise time and a slow exponential fall time.įigure 3: Using Excel to compute waveformįigure 4 shows the resulting repetitive waveform in TINA-TI.įigure 4: Resulting waveform copied and pasted from Excel Generate the x-y table in a spreadsheet program (like Microsoft Excel or equivalent) and copy and paste into the TINA-TI Signal editor panel. What if the waveform is more complicated, or if you want to use an extensive list of x-y points for more accuracy? What if you like to define the waveform algebraically (using an expression)? Simple! You can even make the waveform repetitive provided one full x-y cycle is defined (see Figure 2)!įigure 2: Adding simple text commands make the waveform repetitiveĪs you can see, it is very easy to make a single pulse or a portion of a waveform. TINA-TI does the rest (see Figure 1).įigure 1: Entering source (V G or I G) information that defines the time-variable waveform The key to creating the piecewise linear source is to first put the time (x-axis) and voltage, or current (y-axis), in table form (x, y) and then insert it in the TINA-TI source information dialog. For these situations TINA-TI offers the piecewise linear source which can create either transient or repetitive waveforms. ![]() square wave, triangular wave, etc.) may not suffice for your simulation and you may need to generate a real-life excitation waveform, similar to what is in your system, to verify bench behavior or to predict performance before you build. In this post we’ll learn how to generate: This installment of the TINA-TI series is based on your requests from the list in Part 1. Other Parts Discussed in Post: TINA-TI, LMH6554
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