With the development of VLSI integrated circuits, SoC
becomes more and more complex, which not only consists
of transitional analog circuits, but also comprises registers,
memory, and Digital Signal Processing (DSP) circuits.Since the power determines the operation duration of
hearing-aid SoC and both supply voltage and volume voltage
are 1 V, to minimize the power consumption and realize
accurate control, a mixed-signal programmable TD-POR and
volume control circuit based on SAR ADC for hearing-aid
SoC is presented in this paper.The EOC signal of SAR ADC
is used as the mode-change signal so that the circuit can
detect the battery voltage and volume voltage alternately,
which reduces both circuit size and total power consump-The zinc-air battery that supplies hearing-aid SoC has
a large voltage variation from 1.4 V to 0.7 V. When supply
voltage reaches or drops to the right threshold, to ensure
the accurate power-on control and low-voltage warning,


the POR with ADC must be needed.DTPOR and DTBOR are the delay time to generate the POR and
BOR pulse when the supply voltage reaches VPOR or drops
under VBOR, respectively.The resistance and capacitance devices are affected by
temperature, voltage, and other parameters in the process of
integrated circuit, and the uncertainty of the delay time can
be easily caused.So it can greatly affect
the detection accuracy of the POR and BOR voltage that can
hardly meet the high-resolution requirement.Transitional POR circuits are pure analog circuit that are
based on delay cell and Schmitt Trigger [1-4].