–3 dB bandwidth, stop-band attenuation, settling time, noise, THD Resistor value, RC time constant Sampling frequency, number of bits, acquisition time, SNR, THD Laboratory Data and Analysis The Performance Variables of the Circuit Shown in Figure 2 The following laboratory data and analysis are a guide to the time and frequency response limits of the circuit shown in Figure 2. Table 1 lists the performance variables of the circuit shown in Figure 2. This article features an LPF driver circuit that combines analog low-pass filtering, signal compression, and an ADC driver (see Figure 2). There is a lack of lab data to guide the design of a low-pass filter that drives an ADC. The standard ADC driver has a large sample of experimental data to use for a reliable design procedure. Sampling errors increase directly with the number of ADC bits, input frequency, and sampling frequency. The driver’s settling time, the RC filter’s time constant, driving impedance, and the ADC sampling capacitor’s kickback current interact during acquisition time and contribute sampling errors. A mixed-signal ADC driver circuit optimum performance depends on multiple variables. During ADC acquisition time, the sampling capacitor kicks back an exponentially decaying voltage and current into the RC filter. Figure 1 shows a standard driver-ADC circuit. Introductionĭriving an ADC for an optimum mixed-signal performance is a design challenge. A typical application for a 20 V p-p LPF driver is in industrial, scientific, and medical (ISM) equipment that must digitize a legacy 20 V p-p signal range using a high speed ADC with a lower full-scale input. To reduce the size and cost of an analog signal chain and provide ADC antialiasing protection (ADC input signals in a frequency band around the ADC’s sampling frequency are not protected by a digital filter and must be attenuated by an analog low-pass filter, LPF). Easiest Tools to Choose the Right Electronic Components Also Read Answer:
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