Circuits & Schematics: Design - 3

21. Test technique quantifies jitter of discrete-comparator design
    Tim Davis
    Circuits Measurement Analog Devices AD8220 ADR5041 LT1634 LT3081 REF195
    .. colleague asked for the measured jitter number on a single-supply comparator design based on the LM359 IC ( Ref. 1 ). He wanted to know how the jitter performance of the discrete comparator ...
    Apr 9, 2025

22. Dual comparators match precision industrial, instrumentation application needs
    Tim Davis
    Circuits Analogue Design Measurement Texas Instruments LM359
    .. accurate pulse-width modulated (PWM) waveforms with very high ( 99%) and very low ( 1%) duty-cycle percentages. This design idea (Fig. 1) improves on designs based on the common LM311 and LT1011 devices, both of which require ...
    Apr 4, 2025

23. Versatile multistep resistor load bank is simple and modular
    Vijay Deshpande
    Circuits Measurement
    .. components. However, if a greater number of steps is required, two banks can be connected in parallel as the load bank design is modular. Using simple algorithms, it’s possible to program the load bank to generate resistance ...
    Apr 1, 2025
24. BJT muting switch
    Rod Elliott
    Circuits Audio Fairchild BC549 BC559
    .. but a little known technique that really doesn't look like it could ever work is to use bipolar transistors. The design shown here has extremely low distortion when turned off, and also has very little signal ...
    Apr 1, 2025
25. 100-MHz VFC with TBH current pump
    Stephen Woodward
    Circuits Measurement Texas Instruments CD74AC14 CD74AC74 CD74AC161 SN74LVC1G14 TLV9161
    .. analog designer and author Jim Williams published an awesome design in 1986 for a 100-MHz voltage to frequency converter ( Ref. 1 ). He named this high-climber (picture it on ...
    Mar 25, 2025
26. Can a free running LMC555 VCO discharge its timing cap to zero?
    Stephen Woodward
    Circuits Analogue Design Oscillators Texas Instruments LMC555
    .. design idea (DI) contributor Nick Cornford recently published a synergistic pair of DIs “A pitch-linear VCO, ...
    Mar 24, 2025
27. A simple, purely analog -130 dB THD sine wave generator
    Christopher Paul
    Circuits Oscillators onsemi NE570 SA571
    .. recent Design Idea “Getting an audio signal with a THD 0.0002% made easy” [ 1 ] discloses a low THD sine ...
    Mar 7, 2025
28. Simple setup tests bit-error rate
    Israel Schneiderman
    Circuits Digital Texas Instruments LM393 SN74HC74 SN74HC86
    .. you measure the BER in the lab by applying an RF signal, modulated by a pseudorandom code, to the receiver under test. This Design Idea suggests an alternative method based on the use of a simple square wave. This method may not be superior ...
    Mar 4, 2025
29. 1 A, 20V PWM DAC current source with tracking preregulator
    Stephen Woodward
    Circuits Supply Microchip MIC2253
    .. design idea reprises another “1 A, 20 V, PWM controlled current source” ( Ref. 1 ). Like the earlier ...
    Mar 4, 2025
30. Design an RTD interface with a spreadsheet
    Robert S. Villanucci
    Circuits Analogue Design Measurement Analog Devices AD633 OP177
    .. the system is to achieve a high level of precision. One way to obviate the nonlinear characteristic of an RTD sensor is to design analog hardware to perform the curve-fitting mathematics before any additional signal processing occurs. This ...
    Feb 25, 2025

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