EECS 413 Design Project Design of a 90db CMOS differential amplifier with gainboosting and common mo - PowerPoint PPT Presentation
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EECS 413 Design Project Design of a 90db CMOS differential amplifier with gainboosting and common mo
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EECS 413 Design Project. Design of a 90db CMOS differential ... Push other poles and zeroes past unity gain frequency. Unity Gain of 300 MHz. wu = gm/CL ... – PowerPoint PPT presentation
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Title: EECS 413 Design Project Design of a 90db CMOS differential amplifier with gainboosting and common mo
1
EECS 413 Design ProjectDesign of a 90db CMOS
differential amplifier with gain-boosting and
common mode feedback
- Jimmy Yu
- Gary Sun
- Matt Ng
2
OVERVIEW
- Applications
- Operational Amplifier Architecture
- Topology
- Resistance gainboosting
- Cascode Usage
- Common-mode feedback design
- Frequency considerations
- Simulation Results
- Conclusion
3
USAGE AND APPLICATION
- Speed and accuracy determined by settling
behavior of opamps - Our amp will find uses in
- SC Filters
- Signal-processing functions
- Algorithmic A/D Converters
- Sigma-Delta Converters
- Sum-difference approach to A/D conversion
- Sample-and-hold Amplifiers
- Holds input at output when given hold signal
- Pipeline A/D Converters
4
TOPOLOGY
OpAmp Block Diagram
5
RESISTANCE BOOSTING
- Folded Cascoded Differential to Single-ended
Amplifier. - Utilized to increase the resistance seen by the
output.
Figure 1
Figure 2
6
CASCODING
- Differential Amp Cascoding
- Utilizes gain boosting technique to increase Rout
seen by diff. amp - Uses NMOS and PMOS load to maximize load
7
COMMON MODE FEEDBACK
- Provides Better Linearity
- Greater Stability
- Output Vcm set by circuit
8
CMFB (contd)
- Advantages
- Good linearity
- Large sensitivity to Vcm
- Small parasitic capacitance
- Disadvantages
- Large power consumption
- Large chip area
9
FREQUENCY CONSIDERATIONS
- Dominant pole from output node
- Load capacitance and high resistance
- Phase Margin of 60
- Push other poles and zeroes past unity gain
frequency - Unity Gain of 300 MHz
- wu gm/CL
10
SIMULATION RESULTS
11
CONCLUSION
- Can achieve extremely high gain through
- Folded load network
- Cascoding
- Gain-boost technique
- Large unity-gain frequency can be attained via
- Sizing
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