Circuits & Schematics: frequency - 5

41. 90 µA Precision Voltage-to-Frequency Converter
    Jim Williams
    Circuits Analogue Design Measurement Texas Instruments LM334
    .. 1 is a micropower voltage-to-frequency converter. A 0 V to 5 V input produces a 0 kHz to 10 kHz output with a linearity of 0.05%. Gain drift ...
    Mar 2, 2023

42. Low power voltage-to-frequency converter makes a wireless probe for testing an inductive power supply
    Eliane Garnier Francis Rodes Salma Alozade
    Circuits Wireless Measurement Supply Texas Instruments LMC7211
    .. that prevent entry of a cable or a probe. The circuit in Figure 1 reduces noise effects because its VFC (voltage-to-frequency converter) produces a PPM (pulse-position-modulated) output signal, V OUT , that integrates, or ...
    Aug 3, 2023

43. Fast(er) frequency doubler with square wave output
    Jim McLucas
    Circuits Signal Processing, Filters Texas Instruments SN74LVC1G74 SN74LVC1G86 TLV3501 TLV9052
    .. will operate, if this is an appropriate spec for the circuit. Mentally, I give the circuit a low score if the operating frequency range is, in my opinion, limited. My nagging thought was “can the operating frequency range for ...
    Aug 24, 2023
44. A 50 MHz 50:50-square wave output frequency doubler/quadrupler
    Stephen Woodward
    Circuits Signal Processing, Filters Texas Instruments SN74AC86 SN74AC74 TLV2374
    .. 50:50 square waves, thus slicing and dicing the time axis into equal segments. He’s also often included a wide-range frequency doubler functions: Convert any signal to exactly 50% duty cycle ( Ref. 1 ) Frequency doubler with 50 ...
    Oct 10, 2023
45. RS-232 meets voltage-to-frequency converter
    Stephen Woodward
    Circuits Measurement Interfaces Texas Instruments CD4053B
    .. design idea (DI) does exactly that by using asynchronous RS-232 to power and count pulses from a simple 10-kHz voltage-to-frequency converter (VFC). Getting only one bit of info from each 10-bit serial character may seem inefficient ...
    Nov 19, 2024
46. Reduce EMI by sweeping a power supply's frequency
    John Betten
    Circuits Supply Texas Instruments TL331 UCC3813N-0
    .. the noise, the greater the size, expense, and difficulty of the filter design. Power supplies that operate at a fixed frequency have their largest EMI emission at this fundamental, fixed frequency. Emissions also occur at multiples ...
    Apr 22, 2025
47. Active Antialias Filter for 24-bit ADC Features Low Distortion, High SNR
    Circuits Analogue Design Audio Measurement Analog Devices LT6202 LTC2380-24 LTC6363 LTC6655
    .. 65,536 conversion results in real time, thus providing an increase in signal-to-noise ratio (SNR). Figure 2. The combined frequency response of filter plus ADC is flat out to a 10-kHz input. The inputs of this circuit are driven ...
    Jul 12, 2020
48. Create radio receiver circuits with the LM386 audio amplifier
    Circuits Radio Texas Instruments LM386
    .. by simply connecting a tuned circuit to its input. It turned out that it was possible to create a simple tuned radio frequency (TRF) receiver by implementing the two features of the LM386 mentioned earlier and using a tuned ...
    Jun 18, 2020
49. Negative Linear Regulator Features 0.8 µV RMS Noise and 74 dB Power Supply Rejection Ratio at 1 MHz
    Molly Zhu
    Circuits Supply Analog Devices LT3015 LT3090 LT3094 LT8582
    .. become tougher to meet as the latest precision sensors, high speed and high resolution data converters (ADCs and DACs), and frequency synthesizers (PLLs/VCOs) challenge conventional LDO regulators to produce ultralow output noise and ...
    Jan 13, 2020
50. Single-Chip Circuit Delivers Direction Information In Encoders
    Guido Nopper
    Circuits Measurement Texas Instruments SN74HC14 SN74HC74
    .. ≈ 50 µs. Once the pulse length is known, the maximum speed is determined by: So, the maximum speed or encoder frequency in this example is approximately 5 kHz (Fig. 4). The circuit won’t totally stop working if ...
    Dec 30, 2019

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