differential pairs

differential pairs - ECEN 326 Electronic Circuits...

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Unformatted text preview: ECEN 326 Electronic Circuits Differential Pairs Dr. Aydn Ilker Kar slayan Texas A&M University Department of Electrical and Computer Engineering Emitter-Coupled Pair Emitter-Coupled Pair DC transfer V CC R T I T-V EE V i1 R C I c1 V i2 R C I c2 o2 V V o1 Q 1 Q 2 V i1- V be1 + V be2- V i2 = 0 V be1 = V T ln I c1 I S1 , V be2 = V T ln I c2 I S2 ECEN 326 Electronic Circuits - Aydn I. Kar slayan - Differential Pairs 1 Emitter-Coupled Pair Emitter-Coupled Pair DC transfer I c1 I c2 = exp V be1- V be2 V T = exp V i1- V i2 V T = exp V id V T I c1 + I c2 = I T I c1 = I T 1 + exp - V id V T , I c2 = I T 1 + exp V id V T V o1 = V CC- I c1 R C V o2 = V CC- I c2 R C V od = V o1- V o2 = I T R C tanh - V id 2V T ECEN 326 Electronic Circuits - Aydn I. Kar slayan - Differential Pairs 2 Emitter-Coupled Pair Emitter-Coupled Pair DC transfer I T I T 0.5 I c1 I c2 I c1 ,I c2-V T-4V T-3V T-2V T V T 2V T 3V T 4V T V id -V T-4V T-3V T-2V T V T 2V T 3V T 4V T I T R C I T R C- V id V od ECEN 326 Electronic Circuits - Aydn I. Kar slayan - Differential Pairs 3 Emitter-Coupled Pair Emitter-Coupled Pair Emitter degeneration CC V i1 R C I c1 V i2 R C I c2 V T-V V o2 V o1 Q 1 Q 2 EE R T I E R E R ECEN 326 Electronic Circuits - Aydn I. Kar slayan - Differential Pairs 4 Emitter-Coupled Pair Emitter-Coupled Pair Emitter degeneration I T R C I T R C- V id V od 20V T 10V T-10V T-20V T I T R E =0 I T R E =10V T I T R E =20V T ECEN 326 Electronic Circuits - Aydn I. Kar slayan - Differential Pairs 5 Source-Coupled Pair Source-Coupled Pair DC transfer V DD V i1 R D d1 I V i2 R D I d2 M V o2 V o1 1 M 2 R T I T-V SS V i1- V gs1 + V gs2- V i2 = 0 V gs1 = V t + v u u u u u u u u u t I d1 k 2 W L , V gs2 = V t + v u u u u u u u u u t I d2 k 2 W L ECEN 326 Electronic Circuits - Aydn I. Kar slayan - Differential Pairs 6 Source-Coupled Pair Source-Coupled Pair...
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differential pairs - ECEN 326 Electronic Circuits...

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