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We present an efficient approach for on-chip frequency response measurement, including phase and gain, of analog circuitry in mixed-signal systems. The approach uses direct digital synthesizer (DDS) to supply test sine waves with different frequencies and phases. The output response is analyzed using a multiplier and accumulator. The resultant phase delay measurement is used to correct other measurements...
This paper present a 100MHz 12-bit digital to analog converter (DAC) capable to work under ultra-wide temperature (UWT) range from -180degC to +120degC and at ultra low temperature (ULT) of -230degC. To obtain high resolution and good speed over the UWT, partial thermometer-decoded and segmented scheme is employed. A bandgap voltage reference is designed for UWT applications. The cryogenic DAC chip...
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