op#amp&internal&circuits¤t&measurement&with&sense#transistor&...
TRANSCRIPT
![Page 1: Op#Amp&internal&circuits&Current&Measurement&with&Sense#Transistor& Sensecell &with&ShuntRes .,&Reference#Current &with&Reference#Resistor &](https://reader033.vdocument.in/reader033/viewer/2022041507/5e2591bebf367d11350ca707/html5/thumbnails/1.jpg)
Op-‐Amp internal circuits
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Bipolar (BJT) or MOSFET ?
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N-‐ or P-‐Input for Op-‐Amp ?
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Comparator, Opamp, OTA ?
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Comparator, Opamp, OTA ?
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Basic use of OpAmps
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Comparator with N-‐device as input
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Simple 1-‐stage CMOS -‐ OTA
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gm – compare BJT / MOSFET
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2-‐stage MOSFET – Comparator
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2-‐stage MOSFET – OTA „Miller OTA“
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Bode diagram of Miller OTA
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AC-‐SimulaMon of a 2-‐stage Miller OTA
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AC-‐analysis: Check Stability with Transient Analysis
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w/l scaling for 2-‐stage MOSFET -‐ comparator
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How to avoid/to minimize offset of a comparator
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Random Offset – Monte Carlo SimulaMon
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Improve the offset with larger devices
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MOSFET -‐ comparator with push-‐pull current output
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MOSFET -‐ comparator (OTA) with cascode output
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MOSFET -‐ OTA: Folded cascode
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Folded cascode OTA – frequency response
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Folded Cascode example with p-‐channel input
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Bipolar (BJT) -‐ comparator
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Comparator with P-‐device as input
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pnp-‐input Comparator: Input voltage range
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Darlington inputs
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pnp darlington comparator: current measurement
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P-‐input MOS comparator: logic input buffer with special input specificaMon range
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npn-‐input comparator: open load voltage measurement
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EmiZer / Source Follower as Output Stage
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Opamp as buffer
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npn-‐input Opamp as buffer (voltage follower)
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Opamp with push-‐pull output
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MOSFET -‐ Push-‐Pull Output Stage
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N-‐input MOSFET comparator with hysteresis
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npn-‐input, otherwise MOSFET comp.: voltage measurement
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Bip/MOSFET Comparator with Hysteresis with clamp voltage (vr3) to avoid bipolar saturaMon
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CalculaMon of hysteresis of bipolar comparator
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Comparator with emiZer-‐input
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pnp with emiZer -‐ input
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P-‐channel source-‐input comparator
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Current measurement with Shunt-‐Resistor
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Current Measurement with Shunt-‐Resistor: emiZer-‐input-‐comparator, uses ΔVBE principle
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Current Measurement with Sense-‐Transistor Shunt-‐resistance in series to sense-‐cell
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Current Measurement with Sense-‐Transistor Sense-‐cell with Shunt-‐Res., Reference-‐Current with Reference-‐Resistor
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Current Comparator
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High Voltage Input -‐ Current Comparator with low voltage devices
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Acknowledgments
Dr. Heinz ZiZa
Infineon Technologies Austria