Modeling thermal induced inter-symbol interference of feedback digital to analog converters in delta-sigma modulators
2004
We propose a method to model inter-symbol interference due to temperature mismatch in the transistors of a 1-bit digital to analog converter (DAC) which is used to feedback the quantizer output in a 2nd order continuous time delta-sigma (CT/spl Delta//spl Sigma/) modulator. The degradation in the signal to noise ratio (SNR) with thermal induced inter-symbol interference is reported. The phenomenon is modeled with Verilog-A, and simulated using the Cadence Spectre circuit simulator. The model provides device designers with insight into device behavior which affect circuit and system performance.
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