Circuits & Schematics Analog Devices - 9

81. Pulse Generator with Precision Output-Duty Cycle Operates at a Repetition Rate beyond 50 MHz
    Marián Štofka
    Circuits Oscillators Analog Devices ADCMP603
    A previous Design Idea describes an astable multivibrator that gets hysteresis from the positive feedback stage using a technique you can characterize as positive-capacitive feedback ( Reference 1 ). It creates hysteresis by a charge transfer to ...
    Jun 29, 2022
82. Transconductance Amp Gives Oscillator Reciprocal Response
    Mike Irwin
    Circuits Oscillators Analog Devices AD843
    The circuit in Figure 1 is a variation on the familiar integrator/comparator triangle-wave oscillator, which you typically implement with two op amps. An integrator and a comparator connect in a positive-feedback loop; the comparator drives the ...
    Jun 21, 2022

83. Positive edges trigger parabolic timebase generator
    Marián Štofka
    Circuits Oscillators Analog Devices ADA4062 ADCMP609 ADG1213 ADG1236 ADR433
    Nonlinear systems often need to become linear to be useful, and the circuit in Figure 1 provides a nonlinear sawtooth pulse for a PWM (pulse-width modulator) that can compensate for nonlinearities in sensors, controllers, or systems. The circuit ...
    Jun 20, 2022
84. Dynamic-Load Circuit Determines a Battery's Internal Resistance
    Jim Williams
    Circuits Measurement Supply Analog Devices LT1077 LTC1150 LTC1798 LTC6943
    The simplest model of a battery comprises an ideal voltage source that connects in series with a resistance whose value often a few milliohms depends on the battery's electrochemical condition and construction. If you attempt to use an ordinary ...
    Jun 16, 2022
85. Switched-gain op amp serves as phase detector or mixer
    W Bruce Warren
    Circuits Analogue Design Analog Devices AD8041
    Some op amps, such as the AD8041 from Analog Devices and the EL5100 from Intersil, provide a disable pin, which allows you to parallel the outputs of several op amps for video multiplexing. In addition to this multiplexing, you can also use the ...
    Jun 16, 2022
86. Volume-Unit Meter Spans 60-dB Dynamic Range
    Jon Munson
    Circuits Audio Measurement Analog Devices LT1011 LT1469
    An audio volume-unit meter displays peak-related audio amplitudes to aid in accurately setting recording levels or for displaying an amplifier's operating conditions. A simple diode and capacitor network provides a classic volume-unit ...
    May 24, 2022
87. Circuit Yields Ultralow-Noise VGA
    Dale Ouimette
    Circuits Amplifiers Analog Devices AD620 ADG333
    A number of single-chip VGAs variable-gain amplifiers are available today. Unfortunately, they all have drawbacks, such as high noise, 55 V limit, low input impedance, or nonlinear gain/frequency characteristics. The circuit in Figure 1 is a ...
    Apr 27, 2022
88. Clamping Circuit Lowers Distortion, Improves Overdrive Recovery Time
    John Ardizzoni
    Circuits Analogue Design Analog Devices AD8099
    Some amplifier applications require clamping or limiting due to large, sporadic signals appearing at the amplifier input. Clamping these errant signals protects the amplifier and other sensitive downstream circuitry. It also improves overdrive ...
    Apr 25, 2022
89. Asymmetric Output Into Capacitor Load Turns Capacitor Into Ideal Diode
    Glen Brisebois
    Circuits Analogue Design Analog Devices LT1716
    Comparators are great at turning little signals into large digital outputs. In the example described here, a friend wanted to detect the presence of a small 60-Hz AC signal centered on 2.5 V DC. When the AC is absent (beneath the specified ...
    Apr 20, 2022
90. Synthesize Variable Resistors with Hyperbolic Taper
    TL Flaig
    Circuits Analogue Design Oscillators Analog Devices LT1007
    In adjustable, frequency-selective RC networks, the reciprocal of an RC product, ωC = 1/RC, determines the corner frequencies of the network. If the adjustable elements are potentiometers with a linear-control characteristic that is, taper ...
    Apr 13, 2022

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