T. Ooishi et al., A MIXED-MODE VOLTAGE DOWN-CONVERTER WITH IMPEDANCE ADJUSTMENT CIRCUITRY FOR LOW-VOLTAGE HIGH-FREQUENCY MEMORIES, IEEE journal of solid-state circuits, 31(4), 1996, pp. 575-585
This paper proposes a low voltage operation technique for a voltage do
wn converter (VDC) using a mixed-mode VDC (MM-VDC), that combines an a
nalog VDC and a digital VDC, and provides high frequency application u
sing an impedance adjustment circuitry (IAC), The MM-VDC operates with
a small response delay and a large supply current. Moreover, the IAC
is adopted to the MM-VDC for wide range frequency operation under low
voltage conditions. The IAC can change the supply current capability i
n accordance with the load operation frequency to avoid the overshoot
and undershoot problems caused by the unmatched supply current, A 64 M
b-DRAM test device operated with the MM-VDC achieves well-controlled i
nternal voltage (VCI) level and achieves high frequency operation, The
se systems, the MM-VDC and the IL-VDC, can be applicable for both low
voltage and high frequency operation.