Circuits & Schematics Analog Devices - 5

41. 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
42. 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

43. 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
44. Amplifier compensates piezoelectric-rate gyros
    Jim Mahoney
    Circuits Measurement Analog Devices LT1368 LT1495
    Low-power, low-cost ceramic piezoelectric rate gyros are available, but they lack the low-temperature-coefficient characteristics of their quartz counterparts. However, you can use a servo amplifier to remove the dc level shift due to ...
    May 31, 2023
45. Dual-input sample-and-hold amplifier uses no external resistors
    Marián Štofka
    Circuits Analogue Design Signal Processing, Filters Analog Devices AD8592
    At least two classic ways exist to address applications requiring sampling of a sum of analog voltages. The most common way is to cascade a classic analog adder and a sample-and-hold amplifier. A classic analog adder is an op amp plus at least ...
    May 30, 2023
46. Zero-bias detector yields high sensitivity with nanopower consumption
    Mitchell Lee
    Circuits Wireless Analog Devices LTC1540
    RFID tags, circuits that detect a “wake-up” call and return a burst of data, must operate on very low quiescent current for months or years, yet have enough battery power in reserve to answer an incoming call. For smallest size, most ...
    May 23, 2023
47. Pass transistor lowers dropout voltage
    Matt Schindler
    Circuits Analogue Design Supply Analog Devices MAX8863
    With linear regulators, you measure dropout voltage, V IN V OUT , at the minimum input voltage for which the IC sustains regulation. Low dropout means longer battery life, because the load circuit continues to operate while the battery discharges ...
    May 19, 2023
48. 1Hz-100MHz V-F converter
    Jim Williams
    Circuits Measurement Analog Devices LT1460 LTC1150 LTC6943
    Figure 1’s circuit achieves a wider dynamic range and higher output frequency than any commercially available voltage to frequency (V-F) converter. Its 100 MHz fullscale output (10% overrange to 110 MHz is provided) is at least ten times ...
    May 12, 2023
49. Bipolar (AC) input V-F converter
    Jim Williams
    Circuits Measurement Analog Devices LT1004 LT1011 LT1056 LT1102 LTC201A
    No currently available V-F converter will accept bipolar (AC) inputs. This feature is desirable in power line monitoring and other applications. Figure 1’s V-F converter accepts 10 V inputs, producing a 0 kHz to 10 kHz output. Linearity is ...
    Apr 24, 2023
50. 1.5V Powered, 350ps rise time pulse generator
    Jim Williams
    Circuits Oscillators Analog Devices LT1073
    Verifying the rise time limit of wideband test equipment setups is a difficult task. In particular, the “end-to-end” rise time of oscilloscope-probe combinations is often required to assure measurement integrity. Conceptually, a pulse ...
    Apr 21, 2023

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