All Sections: LT Spice

1. Power supply accepts wide input-voltage range
   Jim Windgassen
   Circuits Analog Devices LT3008 LTC1871
   The switching power supply in Figure 1 produces 3.3 V dc from an input voltage of 2.5 to 20 V dc with high efficiency. The circuit operates at an input voltage as low as 1.5 V once it starts from a minimum of 2.5 V dc, allowing the switcher to ...
   Oct 22, 2025

2. Analog frequency doublers
   John Dunn
   Articles
   .. original sinusoidal frequency, a little trigonometry and four-quadrant multipliers can be useful. Consider the following SPICE simulation in Figure 1. Figure 1. Two analog frequency doublers, A1 + U1 and A2 + U2, in cascade to form a ...
   Oct 11, 2025

3. Buck regulator and two inductors make dual-polarity converter
   Keith Szolusha
   Circuits Analog Devices LT1956
   A common problem for power-supply designers is to create a compact, dual-polarity step-down converter. If space and cost are not concerns, the obvious solution is a pair of DC/DC converters, one for each output. But space and cost are almost always ...
   Oct 8, 2025
4. A temperature-compensated, calibration-free anti-log amplifier
   Christopher Paul
   Articles Texas Instruments REF35250
   .. equation for V 0 given in Figure 1 comes from the Ebers-Moll model. A more advanced model employed by many modern spice simulators, such as LTspice, is the Gummel-Poon model, which I won’t discuss here. It suffices for ...
   Sep 22, 2025
5. Fake contacts, bounced to order
   Nick Cornford
   Circuits Texas Instruments CD74HC132 CD74HC4520
   .. are available! Capturing the bounces from a real switch and then replaying them at varying rates is one approach, and SPICE models are apparently available. I’ve not played with the latter, but trust that its developers had fun ...
   Sep 22, 2025
6. Signal conditioning for platinum temperature transducers
   Jim Williams
   Circuits Analog Devices LT1006 LT1009 LT1027 LT1078 LTC1290
   High accuracy, stability, and wide operating range make platinum RTDs (resistance temperature detectors) popular temperature transducers. Signal conditioning these devices requires care to utilize their desirable characteristics. Figure 1’s ...
   Sep 10, 2025
7. When pulses are omitted in switch-mode power supplies
   Frederik Dostal
   Articles Analog Devices LT3573 LT8620
   Even switch-mode power supplies with a fixed switching frequency do not always show a continuing pattern of pulses. In some conditions, pulses are omitted for various reasons. This is important to consider for output ripple voltage and EMI effects. ...
   Sep 1, 2025
8. Improve the accuracy of programmable LM317 and LM337-based power sources
   Christopher Paul
   Articles Texas Instruments OPA186
   Several Design Ideas (DIs) have employed the subject ICs to implement programmable current sources in an innovative manner ( References 1-3 ). Figure 1 shows the idea. Figure 1. Two independent current sources, one for loads referenced to the more ...
   Aug 26, 2025
9. High-isolation converters use off-the-shelf magnetics
   Mitchell Lee
   Circuits Linear Technology LT1172
   Isolated flyback converters usually evoke thoughts-or bitter memories-of custom transformers, slipped delivery schedules, and agency-approval problems. Off-the-shelf flyback transformers carry isolation ratings of only 300 to 500 V and rarely of as ...
   Aug 26, 2025
10. Ultra-low-noise phantom microphone supply uses tiny DC-DC converter plus capacitor "trick"
    Christopher Jarboe Thomas Mosteller
    Circuits Analog Devices LT8362
    Professional condenser microphones require a 48-V supply to charge the internal capacitive transducer and power the internal buffer for the high-impedance transducer output. You can use a simple boost converter, a filter circuit to reduce ...
    Aug 25, 2025

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