DC-DC Converters in UMC90

kevinwjs

1 Introduction.....................................................................................................................3
1.1
Motivation ..................................................................................................................3

1.2
Related
work...............................................................................................................3

1.3
Thesis
goals ................................................................................................................3

1.4
Thesis
contributions....................................................................................................4

1.5
Thesis
outline..............................................................................................................4



2 DC-DC converter topologies..........................................................................................6
2.1
Nonisolating
converters.............................................................................................6

2.1.1
Buck
converter ..................................................................................................6

2.1.2
Boost
converter .................................................................................................8

2.1.3
Buckboost
converter ........................................................................................9

2.1.4
Cuk
converter ..................................................................................................11

2.1.5
Chargepump
converter...................................................................................12

2.2
Isolating
converters...................................................................................................13

2.2.1
Fly
back
converter...........................................................................................13

2.2.2
Forward
converter ...........................................................................................14

2.3
Applications
of
dcdc
converters..............................................................................15

2.4
Summary...................................................................................................................16



3 System on-Chip DC-DC converters & design choice ................................................17
3.1
Overview
of
system
onchip
dcdc
converters .........................................................17

3.2
Inductor
based
dcdc
converters ...............................................................................17

3.2.1
Introduction
to
micro
fabricated
inductors......................................................18

3.2.2
Fabrication
steps..............................................................................................18

3.3
Switched
capacitor
converters ..................................................................................20

3.3.1
Working
principle ...........................................................................................20

3.3.2
Design
choices ................................................................................................22

3.4
Summary...................................................................................................................22



4 Designing of switched capacitor up converters..........................................................23
4.1
Introduction ..............................................................................................................23

4.2
Designing
of
switched
capacitor
dc
up
converters ...................................................24

4.3
Designing
of
switched
capacitor
Converter .............................................................25

4.3.1
Implementation
of
nonoverlapping
phase
clock
generator............................26

4.3.2
Designing
of
voltage
doubler ..........................................................................27

4.4
Designing
of
random
generator ................................................................................34

4.4.1
Implementation
of
X0R
gate...........................................................................35

4.4.2
Implementation
of
D
Flip
flop ........................................................................36

4.5
Summary...................................................................................................................39



5 Designing of DC- DC down converter for System on-Chip ......................................40
5.1
Overview
of
the
architecture
of
VDC.......................................................................40
   
   

2

5.2
Circuit
description ....................................................................................................41

5.2.1
Reference
voltage
generator............................................................................42

5.2.2
Voltage
follower..............................................................................................44

5.3
Comparison
of
designed
down
converter
with
Zhou’s
converter
[20].....................44

5.3.1
Sizing
of
the
MOSFETs ..................................................................................47

5.4
Summary...................................................................................................................47



6 Simulation results .........................................................................................................48
6.1
Results
for
switched
capacitor
up
converter.............................................................48

6.2
Results
for
differential
based
voltage
down
converter .............................................53

6.3
Summary...................................................................................................................55



7 Layout of circuits ..........................................................................................................57
7.1
Overview
of
layout
process ......................................................................................57

7.1.1
Layout
using
metal
layers ...............................................................................58

7.1.2
Active
and
poly
Layers ...................................................................................58

7.2
Designed
layout ........................................................................................................58

7.3
Summary...................................................................................................................65



8 Conclusion .....................................................................................................................66
8.1
Summary...................................................................................................................66


8.2
Future
work ..............................................................................................................66


DC-DC Converters in UMC90.pdf (1.29 MB, 下载次数: 552 )

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