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Mixed signal tests

Collection of analog and mixed signal test circuits.

Basic goal: a comparator based on the circuit in “CMOS Design” (Jacob Baker).

Extra goals: -A small array (eg 1x8) of Flash cells for characterisation -An alternative comparator layout using only self-biased amplifiers (no bias voltage required) -The digital section of delta-sigma ADC -Demo charge pump -Sample-and-hold circuit

Refer to README for the sample project documentation.