To accelerate the design process, we have developed something new call Analog Engineer’s Circuits. They are in a "recipe" format that includes step-by-step instructions, basic formulas, schematic diagrams and SPICE simulations. While each circuit is available as a standalone document, we’ve also compiled these “recipes” into two downloadable Analog Engineer’s Circuit Cookbooks. One e-book focuses on ADC circuits, while the other includes operational amplifier (op amp) circuits. By compiling the circuits into e-books, you’ll have a powerful resource at your fingertips – a comprehensive library of sub-circuit ideas that you can easily adapt to meet your specific design needs.
The circuit shown in Figure 1 is a typical high-voltage battery monitor circuit. This example shows an amplifier input that translates a ±20V input signal to a differential ±4.8V for use with an analog-to-digital converter (ADC).
Figure 1: ADC input translation 20V to 5V
Each Analog Engineer’s Circuit contains a step-by-step guide for component selection with equations, as well as example calculations for the given circuit configuration. You can use this procedure and modify it, if needed, to meet your needs. The component selection section for the example circuit covers the gain, amplifier swing limitations and bandwidth limitations of the circuit.
After the component selection section, each Analog Engineer’s Circuit provides TINA-TI™ SPICE simulation results for design verification. In the example above, we provide output swing, AC transfer characteristics, settling time and noise simulations. Figure 2 shows the noise simulation for this design. Some circuits provide measured results as well.
Figure 2: Total noise simulation for figure 1
Each circuit also includes links to support materials that provide additional detailed theoretical background on the different design steps and simulated results. For example, the noise section of the example circuit provides links to a series of TI Precision Labs training videos that explain in detail how to calculate, simulate and measure noise. In addition to being a good technical resource, the support materials keep each circuit short and simple, focusing on the key information.
I encourage you to download our Analog Engineer’s Cookbooks and/or browse a complete list of op amp and ADC circuits.
Let us know if you have questions about, or suggestions for, our Analog Engineer’s Circuits by leaving a comment below or in our Data Converters or Amplifiers support forums in the TI E2E™ Community.
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