A field-programmable analog array including an array of a plurality of programmable analog timing circuits, the field-programmable analog array being field-programmable to a plurality of analog or analog-to-digital conversion circuits, such as relaxation oscillators, phase shifters, phase interpolators, pulse width modulators, pseudo exponential digitally controlled oscillators, etc. through programming, without physical re-processing of circuit. A field-programmable mixed signal array according to an embodiment of the present invention comprises a plurality of field-programmable analog arrays, field-programmable digital blocks and field-programmable connecting wire blocks, the field-programmable mixed signal array being field-programmable to a plurality of analog, digital or analog-to-digital conversion circuits, such as digital pulse width modulators, time-digital converters, analog-digital converters, phase-locked loops, DC-DC, AC-DC and DC-AC converters through programming, without physical re-processing of circuit.
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