Circuits & Schematics Analog Devices - 5

41. AC-coupling instrumentation amplifier improves rejection range of differential dc input voltage
    Francis Rodes
    Circuits Analogue Design Amplifiers Analog Devices LT1464
    The need for conditioning low-level ac signals in the presence of both common-mode noise and differential dc voltage prevails in many applications. In such situations, ac-coupling to instrumentation and difference amplifiers is mandatory to extract ...
    Sep 27, 2023
42. Use a DAC to vary LVDT excitation
    Anthony Di Tommaso Ljubisa Milojevic
    Circuits Oscillators Measurement Analog Devices AD712 AD7564BR
    LVDTs (linear variable differential transformers) are electromechanical measuring devices that convert the position of a magnetic core into electrical signals. You generate these signals via excitation on the primary side. The results on the ...
    Aug 31, 2023

43. 5V powered, 0.0015% linearity, quartz-stabilized V-F converter
    Jim Williams
    Circuits Measurement Analog Devices LT1461 LT1671 LT1884 LTC1043
    Almost all precision voltage-to-frequency converters (V-F) utilize charge pump based feedback for stability. These schemes rely on a capacitor for stability. A great deal of effort towards this approach has resulted in high performance V-F ...
    Aug 29, 2023
44. 20 picosecond rise time pulse generator
    Jim Williams
    Circuits Oscillators Analog Devices LTC1799
    Figure 1, fast rise time pulse generator, switches a high grade, commercially produced tunnel diode mount to produce a 20 ps rise time pulse. O1’s clocking (trace A, Figure 2) causes Q1’s collector (trace B) to switch the capacitively ...
    Aug 17, 2023
45. Circuit converts DAC's outputs from single-ended to differential mode
    Liam Riordan
    Circuits Signal Processing, Filters Analog Devices AD5424 AD8042
    High-speed DACs offer differential outputs, but, for low-end ac applications or high-precision level-setting applications, a single-ended current-output DAC with a differential-conversion circuit provides a novel approach to generating ...
    Jul 13, 2023
46. Bootstrap biasing of high input voltage step-down controller increases converter efficiency
    Goran Perica Victor Khasiev
    Circuits Supply Analog Devices LTC3890 LTC3891
    Introduction High voltage buck DC/DC controllers such as the LTC3890 (dual output) and LTC3891 (single output) are popular in automotive applications due to their extremely wide 4 V to 60 V input voltage range, eliminating the need for a snubber ...
    Jul 5, 2023
47. Broadband random noise generator
    Jim Williams
    Circuits Oscillators Measurement Analog Devices LT1004 LT1006 LT1013 LT1226 LT1228
    Filter, audio, and RF-communications testing often require a random noise source. Figure 1’s circuit provides an RMS-amplitude regulated noise source with selectable bandwidth. RMS output is 300 mV with a 1 kHz to 5 MHz bandwidth, selectable ...
    Jun 27, 2023
48. 3.3V powered V/F converter
    Jim Williams
    Circuits Measurement Analog Devices LT1017 LT1034 LTC1043
    Figure 1 is a “charge pump” type V/F converter specifically designed to run from a 3.3 V rail. A 0 V to 2 V input produces a corresponding 0 kHz to 3 kHz output with linearity inside 0.05%. To understand how the circuit works assume ...
    Jun 26, 2023
49. Constant-voltage load box for battery simulation
    Jon Dutra
    Circuits Measurement Supply Analog Devices LT1211
    This article describes an active load circuit that can be used to simulate a battery in any state of charge. The battery simulator provides a constant-voltage load for a battery-charging circuit, independent of applied charging current. The ...
    Jun 22, 2023
50. Battery internal resistance meter
    Jim Williams
    Circuits Measurement Supply Analog Devices LT1077 LTC1150 LTC1798 LTC6943
    It is often desirable to determine a battery’s internal resistance to evaluate its condition or suitability for an application. Accurate battery resistance determination is complicated by inherent capacitive terms which corrupt results taken ...
    Jun 22, 2023

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