AC-coupled Automotive Filter-Amplifier Design-Synthesis Example Mike DonnellyDesigner19 × Mike Donnelly Member for 10 years 5 months 1,546 designs 10 groups Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems. https://explore.partquest.com/node/208676 <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/208676"></iframe> Title Description <p>This Filter/Amplifier Design Example uses a single AEC-Q100 Automotive Qualified op-amp (non-inverting) for the output stage amplifier. This is combined with a single-pole RC input stage low-pass filter. As long as the op-amp has sufficient gain-bandwidth, the total in-band phase shift should be</p> <p>The following calculations can be used to select the component parameter values needed to achieve the performance specifications, including the low-pass pole frequency, DC gain and the drive strength for the expected Load Resistance:</p> <p>Compute Ceff = 1.0/(2*Pi*LPF-pole-frequency*10.0e3)</p> <p>Choose C1 = The largest standard capacitor value that is less than Ceff</p> <p>Choose C2 = A small standard capacitor value that makes C1 + C2 closest to Ceff</p> <p>Compute Reff = (10**(DC Gain/20.0) – 1.0)*55.0e3</p> <p>Choose R3 = closest standard resistor value to Reff</p> <p>Use these rules to choose the OP-AMP part:</p> <p>If Load resistance > 5k Ohm and 10**(DC Gain/20.0) * LPF-pole-frequency</p> <p>Choose an NCV2009 op-amp and characterize the op-amp datasheet model with GBW = 350kHz, SR_max = 0.15e6V/sec and i_shortcircuit = 8.5e-3</p> <p>If Load resistance > 2.0k Ohm and 10**(DC Gain/20.0) * LPF-pole-frequency</p> <p>Choose an NCV2006 op-amp and characterize the op-amp datasheet model with GBW = 3.2MHz, SR_max = 1.2e6V/sec and i_shortcircuit = 19.0e-3</p> <p>If Load resistance > 400 Ohm and 10**(DC Gain/20.0) * LPF-pole-frequency</p> <p>Choose an NCV2003 op-amp and characterize the op-amp datasheet model with GBW = 7MHz, SR_max = 8.0e6V/sec and i_shortcircuit = 96.0e-3</p> <p>If the specifications are outside of this range, then an alternate design is recommended.</p> About text formats Tags lpfAEC-Q100op-amp Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None -