Sinusoidal Signal Generator for ADC Testing in Mixed- Signal SOC
نویسندگان
چکیده
Sinusoidal signal can be used as stimulus to test static and dynamic parameters of ADC. A sigma-delta modulation based sinusoidal signal generator for ADC testing in SOC was introduced. The generator was built on the same chip with ADC. A numerical resonator generated a sinusoidal signal which was converted to a single bit stream by a sigma-delta modulator. Due to oversampling, the quantization noise was pushed to high frequency range. A high-quality sinusoidal signal was generated by low-pass filtering the bit stream. The sigma-delta modulator was inserted into the resonator to decrease silicon area overhead and calculate time. A cascaded integrator comb decimation filter was used as the low-pass filter. The amplitude and frequency of the output sinusoidal signal could be accurately set by digital parameter of the generator to meet the requirement of static and dynamic performances testing.
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