Chapter 6 Differential and Multistage Amplifiers3

# Quiescent analysis if the circuit is perfectly

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Quiescent analysis: if the circuit Is perfectly matched, no output Current flows through the output Terminal. m d g v 2 m d g v 2 m d g v 2

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Determine the Transconductance T m m V I g G 2 = = 2 ) 2 / ( case for the 2 / // 4 2 4 2 o m d o d o d m o o o o o o o o r g v v A r v g v r r r R r r R = = = = = =
Differential Gain The differential gain is determined as G mRo When Input differential resistance 4 2 // ( o o m o m d r r g R G A = = 2 0 2 1 A r g A o m d = = o o o r r r = = 4 2 π r R id 2 =

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Common-Mode Gain and CMRR Ø Common-mode gain: Ø CMRR EE o EE o cm R r R r A 3 4 3 4 2 2 β β - 2245 - = ) )( // ( 4 3 4 02 o EE o m r R r r g CMRR β =
Differential-to-Single-Ended Conversio n A simple but inefficient approach for differential to single-ended conversion. Drawback: Lose a factor of 2(or 6 dB)

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The Active-Loaded MOS Differential Pair The circuit with a differential input signal applied, neglecting the ro of all transistors.
Differential Gain of the Active-Loaded MOS Pair The output resistance ro plays a significa nt role in the operation of active-loaded a mplifier. Asymmetric circuit. Half-circuit is not available. The gain will be determined as GmRo

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Short-Circuit Transconductance Determining the short-circuit transconductance Gm = io / vid
Short-Circuit Transconductance m m g G =

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Output Resistance Circuit for determining Ro . The circled numbers indicate the order of the analysis steps.
Output Resistance

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• Fall '10
• ChengJianping
• Transistor, Bipolar junction transistor, RO, Electronic amplifier, Widlar current source

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