Circuits & Schematics: frequency - 6

51. Single supply 200kHz VFC with bipolar differential inputs
    Stephen Woodward
    Circuits Analogue Design Measurement Microchip LM4040
    .. methods for analog to digital conversion are more “mature” than the classic combination of a voltage-to-frequency converter (VFC) with a counter. VFC digitization is naturally integrating, so good noise rejection is ...
    Jul 24, 2024

52. Low-power ambient light sensing LED driver, with hibernate mode
    Chau Tran
    Circuits Supply Light Analog Devices ADA4807-1
    .. asymptotically approaches the comparator output voltage with a time constant RC. This time constant RC determines the frequency of the oscillation. The duty cycle of the signal can be adjusted by changing the ratio of resistance of ...
    Jul 22, 2024

53. Voltage inverter design idea transmogrifies into a 1MHz VFC
    Stephen Woodward
    Circuits Analogue Design Measurement NXP 74HC4053
    .. capacitor C2 is reduced by several orders of magnitude. This makes the current pumped directly proportional to oscillator frequency: Starting from that idea, then adding some simple discrete components, our original inverter circuit ...
    Jul 18, 2024
54. A low power, low cost, differential input to a single-ended output amplifier
    Chau Tran Jordyn Rombola
    Circuits Analogue Design Amplifiers Analog Devices ADA4807-2
    .. voltage is typically larger than the differential input voltage. The effectiveness of the rejection diminishes as the frequency of the common-mode voltage increases. Amplifiers within the same package have better matching, the same ...
    Jul 15, 2024
55. Low-power, low-cost, differential amplifier with high CMRR
    Chau Tran Jordyn Rombola
    Circuits Amplifiers Analog Devices ADA4805-2
    .. IN+ and IN pins. In this case, the gain resistors become part of the input resistance for the source. The differential-mode frequency response plot was taken by applying a differential input voltage at the two input terminals (IN+ and IN ...
    Jul 10, 2024
56. Difference amplifier measures high voltages
    Chau Tran Moshe Gerstenhaber
    Circuits Analogue Design Measurement Analog Devices AD629BR
    .. to the feedback gain to stabilize the circuit and maximize the system bandwidth. The following equation calculates the pole frequency, f P : The following equation determines the zero frequency, f Z : Figure 3. The circuit in Figure 2 ...
    Jul 1, 2024
57. Portable thermal anemometer hot-transistor bias compensation nulls battery discharge droop
    Stephen Woodward
    Circuits Measurement Texas Instruments LM393
    .. Darlington pair” ( Ref. 2 ) and in Figure 1. Figure 1. Constant-temperature anemometer with direct power-to-frequency conversion. Figure 1’s anemometer is unusual because it melds the sensor transistor into a direct ...
    Jun 27, 2024
58. Ultra-low distortion oscillator. Part 2 - The real deal
    Nick Cornford
    Circuits Audio Oscillators Texas Instruments LM4562
    .. cutting the ripple to a quarter of the single-phase value. That ripple will also be at four times the fundamental frequency, so we are (roughly) sixteen times better off than we were with the Wien bridge. With ...
    Jun 27, 2024
59. Ultra-low distortion oscillator. Part 1 - How not to do it
    Nick Cornford
    Circuits Audio Oscillators Texas Instruments LM4562
    .. levels down to 0.0003% (3 ppm) can be achieved, so we have one benchmark, though that’s most likely for a spot frequency rather than for a multi-range, fully-tunable device. A practical target is 96 dB or 0.0015%, which is ...
    Jun 26, 2024
60. Analog comparator recognizes three signal relations
    Glen Chenier
    Circuits Analogue Design Measurement Intersil ICL7650S
    .. optical fiber to indicate the presence of light, its direction of travel, and the presence of combinations of low-frequency test tone modulation. Its purpose was to positively identify a particular optical fiber in a manhole or ...
    Jun 20, 2024

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