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analyze voltage transfer characteristic (VTC) of the ECL inverter step by step with equations


analyze voltage transfer characteristic (VTC) of the ECL inverter step by step with equations

 
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Answer #1

YCC I ik lk Viny V niny Vin YBB Q2N2222 lk -YEE

  • With Vin < VBB, Qi is off and Qr is in the forward active region of operation; then

                    Vinv = VCC = VOH

                    Vninv = VCC –IE *Rcr = VOL

  • With Vin = VBB, Qi and Qr are both active

                          Vinv = Vninv = VCC –[(VBB –VBE(ECL) +VEE)/(2*RE)]*Rc.

  • As Vin increased beyond VIL, Qi begins to conduct

                          Vinv = VCC –(Rci/Rcr)*[VIH –VBE(ECL) + VEE] = VOL

  • When Vin is increased beyond VIH

                           Vinv= VCC –(Rci/Rcr)*[Vin –VBE(ECL) + VEE].

  • Qi will eventually saturate with further increases of the input.

          VCC + VBC(sat) +RCI (VBE(sat) - VEE] RE Vs= 1+RCI RE

  • And

                   Vin = Vs , Vinv = Vs –VBC(sat)

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