All Sections: LT Spice - 7

61. Bandpass filter has adjustable Q
    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 ...
    12-12-2023

62. Force/sense connection eliminates multiplexer on-resistance error
    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 ...
    08-12-2023

63. The golden rule of board layout for switch-mode power supplies
    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 ...
    29-11-2023
64. Circuit's RMS output is linearly proportional to temperature over wide range
    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 ...
    03-10-2023
65. AC-coupling instrumentation amplifier improves rejection range of differential dc input voltage
    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 ...
    27-09-2023
66. Single cell flashes white LED
    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 ...
    26-09-2023
67. 5V powered, 0.0015% linearity, quartz-stabilized V-F converter
    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 ...
    29-08-2023
68. Light powers isolation amplifier
    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 ...
    27-07-2023
69. Solve low-frequency-cutoff problems in capacitive sensors
    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 ...
    26-07-2023
70. Simple dc/dc converter increases available power in dual-voltage system
    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 ...
    12-07-2023

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