Circuits & Schematics Analog Devices

1. Circuit improves on bias for GaAs FETs
   Tom Roberts
   Circuits Supply Amplifiers Analog Devices LT1085
   It's important to properly sequence the bias applied to an RF/microwave GaAs FET or a MMIC (monolithic-microwave-IC) amplifier. These devices are extremely sensitive to drain and gate voltage levels as well as to the order in which these biases ...
   Dec 3, 2025
2. Circuit offers series protection against power-line transients
   Alfredo Saab
   Circuits Supply Analog Devices MAX1614
   Voltage transients on low-voltage power lines can sometimes attain amplitudes many times the nominal voltage level. That behavior often calls for protection against the application of improper power levels. The usual way to protect sensitive ...
   Dec 1, 2025

3. Protecting your prototype with automotive overvoltage protection
   Simon Bramble
   Circuits Supply Analog Devices MAX16126
   Abstract This article describes the use of a load dump protection circuit to prevent accidental overvoltage/reverse-voltage conditions during prototyping. This simple circuit can prevent hours of rework caused by momentary lapses of concentration ...
   Nov 21, 2025
4. Power supply accepts wide input-voltage range
   Jim Windgassen
   Circuits Supply 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
5. Voltage-to-period converter offers high linearity and fast operation
   Jordan Dimitrov
   Circuits Measurement Microcontrollers Usage Analog Devices AD650
   The circuit in Figure 1 converts the input DC voltage into a pulse train. The period of the pulses is proportional to the input voltage with a 50% duty cycle and a nonlinearity error of 0.01%. The maximum conversion time is less than 5 ms. Figure ...
   Oct 21, 2025
6. Buck regulator and two inductors make dual-polarity converter
   Keith Szolusha
   Circuits Supply 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
7. Signal conditioning for platinum temperature transducers
   Jim Williams
   Circuits Analogue Design Measurement 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
8. Simple but accurate 4 to 20 mA two-wire transmitter for PRTDs
   Stephen Woodward
   Circuits Analogue Design Measurement Interfaces Analog Devices LM4040
   Accurate, inexpensive, and mature platinum resistance temperature detectors (PRTDs) with an operating range extending from the cryogenic to the incendiary are a gold (no! platinum! ) standard for temperature measurement. Similarly, the 4 to 20 mA ...
   Sep 2, 2025
9. Ultra-low-noise phantom microphone supply uses tiny DC-DC converter plus capacitor "trick"
   Christopher Jarboe Thomas Mosteller
   Circuits Audio Supply 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
10. Converting pulses to a sawtooth waveform
    Christopher Paul
    Circuits Analogue Design Oscillators Analog Devices LM4041
    There are multiple means of generating analog sawtooth waveforms. Here’s a method that employs a single supply voltage rail and is not finnicky about passive component values. Figure 1 shows a pair of circuits that use a single 3.3-V supply ...
    Jul 21, 2025

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