CMOS VLSI .


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CMOS VLSI. Analog Design. Outline. Overview Small signal model, biasing Amplifiers Common source, CMOS inverter Current mirrors, Differential pairs Operational amplifier Data converters DAC, ADC RF LNA, mixer. CMOS for Analog.
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Slide 1

CMOS VLSI Analog Design Analog Design

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Outline Overview Small flag show, biasing Amplifiers Common source, CMOS inverter Current mirrors, Differential sets Operational enhancer Data converters DAC, ADC RF LNA, blender Analog Design

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CMOS for Analog MOS gadget can be utilized for intensification and exchanging Typical: work gadgets in immersion, entryway voltage sets current Benefits Cheap procedures (contrasted with BJT) Integrated bundles Challenges Low pick up Coupling issues Tolerances Analog Design

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MOS Small Signal Model Analog Design

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MOS Small Signal Model From first request immersion conditions: Rewrite regarding sensitivities: So Analog Design

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Channel Length Modulation in actuality yield current does change with V ds Output resistance Analog Design

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Bias Point Standard circuits for biasing Compute parameters from I-V bends Analog Design

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Outline Overview Small flag demonstrate, biasing Amplifiers Common source, CMOS inverter Current mirrors, Differential sets Operational speaker Data converters DAC, ADC RF LNA, blender Analog Design

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Common Source Amplifier Operate MOS in immersion Increase in V gs prompts drop in v out Gain A = v out/v in Analog Design

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CMOS Inverter as an Amplifier Can utilize pMOS fixing to V dd for resistive load in like manner source intensifier Do better by having a "dynamic load": increment stack resistance when V in goes up Analog Design

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AC Coupled CMOS Inverter How to get most extreme intensification? Inclination at V inv utilizing criticism resistor Use capacitor to AC couple the information Analog Design

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AC Coupled CMOS Inverter Analog Design

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Current Mirrors Replicate current at contribution at yield Ideally, I out = I in immersion, so unending yield impedance Channel length adjustment: utilize huge L Analog Design

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Cascoded Current Mirror Key to comprehension: N1 and N2 have practically same deplete and door voltage Means high yield impedance Raise yield impedance utilizing a cascoded current reflect Analog Design

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Current Mirror Can utilize numerous yield transistors to make numerous duplicates of info current Better than utilizing a solitary more extensive transistor, since indistinguishable transistors coordinate better Analog Design

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Differential Pair Steers current to two yields in view of contrast between two voltages Common mode clamor dismissal Analog Design

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Differential Amplifier Use resistive loads on differential match to assemble differential enhancer Analog Design

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CMOS Opamp Differential intensifier with basic source speaker Diff amp utilizes pMOS current reflect as a heap to get high impedance in a little territory Common source amp is P3, stacked by nMOS current reflect N5 Bias voltage and current set by N3 and R A = v o/(v 2 – v 1 ) = g mn2 g mp3 (r on2 | r op2 ) (r op3 | r on5 ) Opamp: workhorse of simple plan Analog Design

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Outline Overview Small flag demonstrate, biasing Amplifiers Common source, CMOS inverter Current mirrors, Differential sets Operational speaker Data converters DAC, ADC RF LNA, blender Analog Design

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Data Converters DACs really simple to outline, ADCs harder Speed, linearity, control, estimate, simplicity of-outline Parameters Resolution, FSR Linearity: DNL, INL, Offset Analog Design

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Noise and Distortion Measures DAC: apply computerized sine wave, measure craved flag vitality to music and commotion ADC: apply simple sine wave, do FFT on the put away specimens Measure add up to consonant bending (THD), and spurious free element go (SFDR) Analog Design

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DAC Resistor String DACs Use a reference voltage stepping stool comprising of 2 N resistors from V DD to GND for a N-bit DAC Presents substantial RC, needs high load resistance Use: reference for opamp, support, comparator Analog Design

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DAC R-2R DACs Conceptually, assessing parallel expression Much less resistors than resistor string DACs Analog Design

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DAC Current DAC: quickest converters Basic guideline Different structures Analog Design

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DAC Full execution: 4-bit current DAC Analog Design

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ADC Speed of transformation, number of bits ( ¹ ENOBs) Easy ADC: Successive Approximation Analog Design

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ADC Flash ADC: most elevated execution Analog Design

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ADC Crucial segments: comparator, encoder Analog Design

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ADC Pipeline ADC Amounts to a dispersed progressive approx ADC Trades streak speed and low inactivity for longer inertness and somewhat bring down speed Much less power Analog Design

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ADC Sigma-delta converter Suitable for procedures where advanced is shabby CD players: sound frequencies, 20 bit exactness RF (10MHz): 8-10 bit accuracy Analog Design

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Outline Overview Small flag display, biasing Amplifiers Common source, CMOS inverter Current mirrors, Differential sets Operational enhancer Data converters DAC, ADC RF LNA, blenders Analog Design

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RF Low in gadget include, high exertion Sizing, segment choice extremely included Analog Design

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Mixers Analog multiplier, ordinarily used to change over one recurrence to another Various approaches to actualize multipliers Quad FET switch Gilbert cell Analog Design

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Noise Thermal commotion v^2 = 4kTR (Volt^2/Hz) Shot commotion i^2 = 2qI (Amp^2/Hz) 1/f clamor Very intricate wonder Proportional to 1/f Makes RF plan exceptionally troublesome Analog Design

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