![]() A Start Command is then required to begin the sweep. To perform the frequency sweep, the user must first program the conditions required for the sweep start frequency, delta frequency, step frequency, etc. Frequency resolution of 27 bits (less than 0.1 HZ) can be achieved. The signal is provided on chip using DDS techniques. Output ranges of 1 V, 500 mV, 200 mV can also be programmed. The system allows the user to program a 2 V PK-PK sinusoidal signal as excitation to an external load. ![]() The impedance can be calculated at each point and a frequency vs magnitude plot can be created. To determine the actual real impedance value Z(W), generally a frequency sweep is performed. The impedance magnitude and phase is easily calculated using the following equations:: The FFT algorithm returns a Real (R) and Imaginary (I) data word, allowing impedance to be conveniently calculated. The response signal from the impedance is sampled by the on board ADC and FFT processed by an onboard DSP engine. The frequency generator allows an external complex impedance to be excited with a known frequency. The AD5934 is a high precision impedance converter system solution which combines an on board frequency generator with a 12-bit, 250 kSPS ADC. ![]() Details, datasheet, quote on part number: AD5934 PartĢ50 kSPS 12-Bit Impedance Converter Network Analyzer
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