Transcription of II – Bias circuit II. Bias circuit - SIUE
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II – Bias circuit II. Bias circuit - SIUE
II. bias circuitOutlineCMOS current mirrors Definitions Basic stage for current mirrors Simple current mirror Wilson current mirror Improved Wilson current mirror Cascode current mirror Modified cascode current mirror High-compliance current mirrors (I - II) Regulated cascode current mirror Low-voltage current mirrorsCurrent references Introduction Simple current reference Current references based on a built-in voltage Current references based on a reference voltageVoltage references Introduction Supply dividers Voltage references based on a built-in voltage Voltage references based on the band-gap voltage Voltage references based on MOS VTH differenceII bias circuitA. Baschirotto - bias circuitII 2II. bias circuitIntroduction Active devices (transistors) have to be properly biased toprocess the signal In an analog signal processing circuit there are twofundamental parts:Processing partBias circuit The processing part is devoted to elaborate the signalDynamic requirement The bias circuit is devoted to supply currents and/orvoltages to the processing one in order to allow it toproperly operateStatic requirement (Low-frequency, immunity to VDD noise,temperature, and technology spread)II bias circuitA.
II – Bias circuit A. Baschirotto - Bias circuit II – 9 Simple Current Mirror Factors affecting the mirror accuracy • Channel length modulation (λ)
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