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ISSCC2020-SC-2.pdf

ISSCC2020

Short

Course

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108页

ISSCC2020的short Course，Modeling and RF Design Considerations for Advanced CMOS Technology

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Modeling and RF Design Considerations for

Advanced CMOS Technology

Ali M. Niknejad

Professor, UC Berkeley

niknejad@berkeley.edu

February 20, 2020

February 2020 Modeling and RF Design Considerations 1 of 106

MOSFET as Si Brick

o MOSFET devices plays an increasingly important role in RF and microwave

circuits

n Small-Signal amplifier [LNA, drivers]

n Large-Signal power device [PA’s, VCO’s, mixers]

n Low-loss switching devices (mixers) [MOS+MOM capacitor]

n Varactor [MOS-cap]

o Compact modeling of the MOSFET is of integral importance

February 2020 Modeling and RF Design Considerations 2 of 106

What could possibly go wrong?

o Amplifier oscillates

o Oscillator is dead

o Amplifier stages stagger tuned

o Gain lower than expected

o Unwanted spurs

o VCO phase noise higher

o Amplifier noise figure higher

o Swing lower than expected

o Power lower than expected

February 2020 Modeling and RF Design Considerations

Blame the model !

3 of 106

Those Pesky Compact Models

o RF designers today don’t trust their CMOS compact

models:

n “CMOS LNA noise figure 0.5 dB higher than simulated.”

n “VCO noise figure 2.2 dB higher than simulated.”

n “PA output power 2 dB lower than expected.”

n “Mixer IIP3 does not match measurements. Trend versus

bias is wrong and input power is wrong!”

n “Input match at wrong frequency!”

o Passive device models also problematic:

n “Spiral inductor Q was 40% less than expected!”

February 2020 Modeling and RF Design Considerations 4 of 106

Presentation Outline

o Part 1: Actives

n Gain:

o Intrinsic gain, power gain, maximum stable gain, unilateral gain

n Speed

o f

and f

max

n Noise

o F

min

opt

, R

)

o Excess thermal noise.

o Flicker noise.

n Distortion

o Is a MOSFET really square-law?

o Part 2: Passives

o Compact Models (Briefly)

February 2020 Modeling and RF Design Considerations 5 of 106

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The International Solid-State Circuits Conference is the foremost global forum for presentation of advances in solid-state circuits and systems-on-a-chip. The Conference offers a unique opportunity for engineers working at the cutting edge of IC design and application to maintain technical currency, and to network with leading experts…

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