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SW/HW Co-design

Term Project

Charge Pump System For DC/AC Conversion with Changeable

Frequency

R92943074 胡以農R92943061 詹作晟

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Outline

System Block Diagram Charge Pump Circuit Oscillator Circuit Control Signal ADC Circuit Simulation Results Conclusion

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System Block Diagram

DC Charge Pump

Oscillator

1.8 V 3.6 V

Vdd

Control

AC Charge Pump

ADC

Clock

Clock

7.2 V

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Charge Pump Circuit

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Analysis of The Charge Pump

Charge phase Transfer phase

Vin CinCf

- Vin +

LOAD

CfVin Cin

Cout

q2Vin

_

+

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Waveform of DC Charge Pump

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Charge Pump For DC/AC Conversion

RL

Vin Cin

S11 S12

S17 S19S18

S15

S1

S13

Charge Pump 1

Cf1 Cf2

S14

S16

S21S22

S27S29 S28

S25

S2

S23

Charge Pump 2

Cf4Cf5

S24

S26

S10 S20Cf3 Cf6

V1 V2

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Phase 1

RL

Vin Cin

S11 S12

S17 S19S18

S15

S1

S13

Charge Pump 1

Cf1 Cf2S14

S16

S21S22

S27S29 S28

S25

S2

S23

Charge Pump 2

Cf4Cf5S24

S26

S10 S20

Cf3 Cf6

- Vin + - Vin + - Vin + - Vin + - Vin + - Vin +

V1 V2

- Vo +

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Phase 2

RL

Vin Cin

S11 S12

S17 S19S18

S15

S1

S13

Charge Pump 1

Cf1 Cf2S14

S16

S21S22

S27S29 S28

S25

S2

S23

Charge Pump 2

Cf4Cf5S24

S26

S10 S20

Cf3 Cf6

- Vin + - Vin + - Vin + - Vin + - Vin + - Vin +V1 V2

- Vo +

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AC Output Voltage

t

4Vin

0 t

V1

4Vin

0 t

V2

Vo

t

4Vin

-4Vin

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Waveform of AC Waveform

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Oscillator Circuit

VL

VH

C

I

VH

VL

H

H

f = I/2CV

L L

L LS

R

Q

V=(VH-VL) I

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Control Signal

Op

Oscillator

AADC

Control signals0000

0001

0011

0111

1111

Charge Pump

Cf

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ADC Simulation Circuit

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Matlab Simulation

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Simulation Result

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Conclusion

Use more than one small capacitor in a chip to achieve the large driving current ability.

Use low voltage to produce a high voltage in order to drive a system.