All Sections: LT - 8

71. Bridge measures small capacitance in presence of large strays
    Jeff Witt
    Circuits 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

72. 0.05 µV/°C chopped amplifier requires only 5 µA supply current
    Jim Williams
    Circuits 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

73. Bandpass filter has adjustable Q
    Frank Cox
    Circuits 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
74. Force/sense connection eliminates multiplexer on-resistance error
    Stephen Woodward
    Circuits 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
75. The golden rule of board layout for switch-mode power supplies
    Frederik Dostal
    Articles Analog Devices LT8640S
    This article explains the basis for achieving an optimized board layout, a critical aspect in the design of switch-mode power supplies. A good layout ensures stable functioning of the switching regulator and minimizes radiated interference as well ...
    Nov 29, 2023
76. Circuit's RMS output is linearly proportional to temperature over wide range
    R O Ocaya
    Circuits Analog Devices LT1001
    It is known that the p-n diode can be the basis of an accurate thermometer for cryogenic temperatures up to about 200 C. A constant current is maintained through the diode and the voltage across it gives an indication of the temperature. The ...
    Oct 3, 2023
77. AC-coupling instrumentation amplifier improves rejection range of differential dc input voltage
    Francis Rodes
    Circuits 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
78. Single cell flashes white LED
    Anthony Smith
    Circuits
    Many portable appliances and other products that must operate from a single cell are restricted to working at very low voltages. It is thus difficult to drive white LEDs that typically have a forward voltage of 3 to 5 V. The ability to flash the ...
    Sep 26, 2023
79. 5V powered, 0.0015% linearity, quartz-stabilized V-F converter
    Jim Williams
    Circuits 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
80. Light powers isolation amplifier
    Stephen Woodward
    Circuits Microchip LMC7101
    Self-powered isolation amplifiers, which need no external isolated power supply, provide versatile and convenient interfaces in many applications that require galvanic isolation of the signal source. Examples of such applications include circuits ...
    Jul 27, 2023

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