a 230mv-to-500mv 375khz-to-16mhz 32b risc core in 0.18 µm cmos
DESCRIPTION
A 230mV-to-500mV 375KHz-to-16MHz 32b RISC Core in 0.18 µm CMOS. D-NPSBB. Split-Style Clock Generator. Multi-Rail Standard Cells. 32b RISC Core and Sub-V T Operation. Chip Photo and Summary. Vibrations on V DD and V DDV. 230mV (Sub-V T ) Operation. ULV-CMOS Performance and Summary. - PowerPoint PPT PresentationTRANSCRIPT
1
A 230mV-to-500mV 375KHz-to-16MHz 32b RISC Core in 0.18µm CMOS
in out
VDD
VDDV
VGP
VPW
VNW slpd
Standard cell Body Bias Driver
VDD
Power switch
VPW (M1)
VNW (M1)
Combinational circuit
VDD (M3)
GND (M3)
VDDV (M3)
Flip-Flop
GND (M3)
VDDV (M3)
inVP
VDD VDD
1
0
1
0
CLKint
CLKext
pslpi
pvgp
pslpi
pvgp
VPVGP
slpd
BF1 BF1
sleep mode
wakeup mode
MP4
MP2
MP3
active mode
VDD
D-NPSBB
Split-Style Clock Generator Multi-Rail Standard Cells
2
32b RISC Core and Sub-VT Operation
230mV (Sub-VT) OperationBSC
doretd
ALU
Multiplier
Barrel shifter parent
Control .Logic .
dir RegisterBank
AR
Hard Block
Test circuits and Level converters
Coupling Capacitors
800μm
1050μm
570μm
Level Converters
Power Switch
250μm
TechnologyTarget circuit
Transistor countDie size
CPU Core areaHard Block area
ARM7-like RISC core(3-stage pipeline)
179k1.5mm * 1.5mm
0.84mm2
0.1243mm2
Chip SummaryVT (H/L)
Operation frequency
Power(per MHz)
520mV/250mV16MHz@500mV5MHz@350mV
[email protected]μ[email protected]μW@350mV
122.67μW@230mV
0.18μm CMOS 1P6M
RESET
CLKint
Out[2] &
Out[3]
H/W Reset
S/W Reset Normal Operation
(375KHz)
1.5V
230mV
1.5V
VDD
VDDV
±33mV
±62mV
min. VDD =230mV±33mV
min. VDDV =197mV±62mV
Vibrations on VDD and VDDVChip Photo and Summary
3
ULV-CMOS Performance and Summary
Acknowledgements:- Thank the CIC for support the chip fabrication- Thank the teammates of SoC group of National Chung-Cheng University for great helps
Achievements: - at least 3X faster than the competitors- Reach the lowest voltage (230mV) of all
Applicability:- Single solar cell- Similar work: a handheld game console (GBA) at 16.78MHz
Without P
ower Gatin
g
With Power G
ating
37.34X
801
230
3.02
14.61X
VDD (mV)
44.11
21.45