All Sections: LT Spice - 10

91. 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

92. Solve low-frequency-cutoff problems in capacitive sensors
    Julius Foit
    Articles STMicroelectronics TS271
    .. of general active-filter theory, or you can simulate the circuit behavior with any of the common simulation tools, such as Spice. By an intelligent choice of passive-component values, you can easily control the circuit's behavior in ...
    Jul 26, 2023

93. Simple dc/dc converter increases available power in dual-voltage system
    David Kim
    Circuits Linear Technology LT1946
    The schematic in Figure 1 shows a way to increase the power available from a current-limited 5 V supply by adding power from a 5 V supply. The dc/dc converter generates a single 12 V, 150-mA (1.8 W) output from two regulated and current-limited ...
    Jul 12, 2023
94. Broadband random noise generator
    Jim Williams
    Circuits 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
95. 3.3V powered V/F converter
    Jim Williams
    Circuits 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
96. Constant-voltage load box for battery simulation
    Jon Dutra
    Circuits 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
97. Battery internal resistance meter
    Jim Williams
    Circuits 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
98. Simple, precise, bi-directional current source
    Jerry Steele
    Articles onsemi NCS2005
    .. (R SENSE should be limited to 1 kΩ unless you are adventurous). A caution on simulating this circuit. Not all op amp spice models correctly model the flow of load current in the power supply pins, an essential behavior to simulating ...
    Jun 20, 2023
99. Quasiresonant flyback converter easily charges energy-storage capacitors
    Todor Arsenov
    Circuits STMicroelectronics L6562 L6565
    Designers often use chargers with flyback topologies to quickly charge energy-storage capacitors (references 1 and 2 ). In a flyback topology, the energy transfer takes place only when the charger’s power MOSFET is off, which effectively ...
    Jun 8, 2023
100. Topology implements updated version of non-isolated capacitive power converter
     Zbyno Brudny
     Circuits Linear Technology LTC1046
     .. only a very short time when the charge from C1 has to supply the rest of the circuit. The circuit has been simulated using LT-Spice version 4.19, as well as built and tested (Fig. 3). Figure 3. C1 has to supply the rest of the circuit of ...
     Jun 2, 2023

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