Circuits & Schematics Analog Devices - 7

61. 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
62. 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

63. 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
64. 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
65. 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
66. 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
67. Isolated PWM suits low frequencies
    Tim Regan
    Circuits Signal Processing, Filters Analog Devices LT1719 LT6255 LTC6992-2
    Many industrial- and medical-system circuits require isolation from the mains-ac power. You can often send a signal across the isolation barrier using a small transformer; transformers do not pass low-frequency signals well. The circuit in this ...
    Apr 12, 2023
68. Anticipator circuit speeds signal settling to a final value
    Tim Regan
    Circuits Analogue Design Measurement Analog Devices LTC6257
    The circuit in this Design Idea anticipates, or jumps instantly to, the final voltage of an input-signal change. It relies on the fact that the intended input signal changes exponentially with a known time constant. This circuit was adapted from a ...
    Apr 5, 2023
69. Simple fixture statically tests programmable-gain amplifiers
    Marián Štofka
    Circuits Measurement Amplifiers Analog Devices AD8253
    The advent of instrumentation amplifiers with digital gain switching offers obvious advantages, such as board-space saving, higher reliability because of fewer solder joints, and lower total cost. These valuable features stem from the fact that the ...
    Mar 29, 2023
70. Simple anticipator circuit improves on earlier idea
    Nicholas Lockerbie
    Circuits Analogue Design Measurement Analog Devices AD820BR
    A self-biasing thermistor circuit had an overall dominant thermal/ electrical time constant as small as 25 msec but had a significantly rounded response following a square (thermal) input pulse of 100 msec; the source was a pulsed blue LED. A ...
    Mar 29, 2023

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