Circuits & Schematics Analog Devices - 4

31. Using an inductor to improve an existing design
    Peter Demchenko
    Circuits Supply Analog Devices ADR444
    Here is the circuit in Figure 1 from a previous DI ( Ref. 1 ): Figure 1. Simple local low-noise voltage converter that can be used when a simple negative supply of low voltage is required. It is simple, and its efficiency can be improved by a very ...
    Jan 31, 2024
32. Control a processor's power supply in real time
    Yogesh Sharma
    Circuits Supply Microcontrollers Usage Analog Devices AD5258 ADP3051
    In battery-powered applications in which power management is key, a microprocessor may adjust its core voltage corresponding to an increase or a decrease in clock speed, allowing full processing power when necessary but not wasting excess power ...
    Jan 25, 2024

33. Amplifier requires no dc bias
    John Guy
    Circuits Signal Processing, Filters Amplifiers Analog Devices MAX4242
    Intrinsically capacitive transducers and other high-impedance signal sources usually require ac coupling and a buffer amplifier to condition the signal for further processing. Buffers take many forms, but most of them compromise signal quality ...
    Dec 27, 2023
34. Bridge measures small capacitance in presence of large strays
    Jeff Witt
    Circuits Measurement Analog Devices LT1004 LT1413 LT1462 LTC1043
    Capacitance sensors measure a wide variety of physical quantities, such as position, acceleration, pressure and fluid level. The capacitance changes are often much smaller than stray capacitances, especially if the sensor is remotely placed. I ...
    Dec 18, 2023
35. 0.05 µV/°C chopped amplifier requires only 5 µA supply current
    Jim Williams
    Circuits Amplifiers Analog Devices LT1495 LTC1440
    Figure 1 shows a chopped amplifier that requires only 5.5 µA supply current. Offset Voltage is 5 µV, with 0.05 µV/ C drift. A gain exceeding 10 8 affords high accuracy, even at large closed-loop gains. Figure 1. 0.05 µV/ C ...
    Dec 15, 2023
36. Bandpass filter has adjustable Q
    Frank Cox
    Circuits Signal Processing, Filters Analog Devices LT1228
    The bandpass filter circuit shown in Figure 1 features an electronically controlled Q. Q for a bandpass filter is defined as the ratio of the 3 dB pass bandwidth to the stop bandwidth at some specified attenuation. The center frequency of the ...
    Dec 12, 2023
37. Force/sense connection eliminates multiplexer on-resistance error
    Stephen Woodward
    Circuits Amplifiers Analog Devices LT1028
    Digitally controlled gain is an everyday analog-design element. You frequently find this element in an op-amp-based, transimpedance current-to-voltage converter. When you design digital gain control into such a converter, the usual scheme is to ...
    Dec 8, 2023
38. Simple night-light uses a photoresistor to detect dusk
    Chau Tran
    Circuits Automation Beginners Light Analog Devices AD8214
    Streetlights, emergency lights, and security lights must automatically turn on when it gets dark. You base the control circuit on the resistance of a photoresistor or another LDR (light-dependent resistor) that varies with light intensity. An ...
    Oct 24, 2023
39. Adjust op-amp gain from -30 dB to +60 dB with one linear pot
    Stephen Woodward
    Circuits Analogue Design Amplifiers Analog Devices OP37
    A good manually adjusted audio gain stage is characterized by: Low noise and low distortion, A 20 kHz bandwidth, A wide gain adjustment range (e.g. 90 dB), and Logarithmic (at least pseudo-logarithmic) control characteristic to Efficiently span ...
    Oct 24, 2023
40. DC-voltage doubler reaches 96% power efficiency
    Marián Štofka
    Circuits Supply Analog Devices AD8617 ADG888
    The voltage-doubler circuit in Figure 1 can convert 2.5 V dc to 5 V dc or 1.8 V to 3.3 V. Most voltage doublers use an inductor, but this circuit doesn’t need one. The circuit uses a capacitor, C, by charging it through serially connected ...
    Oct 19, 2023

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