ECE 206 - Write-up Lab 7 - CMOS Transient Analysis...

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CMOS Transient Analysis Experiment 7 Question 1: For both the circuit having the 100pF capacitors and the circuit having the 390pF capacitors, calculate the average propagation delay (( ) 2 / ) PHL PLH t t + , and the maximum switching frequency: r f t t f + = 1 max What effect does the increased capacitance (i.e., replacing the 100pF capacitors with the 390pF capacitors) have on the measurements? Performing calculations for the 100pF capacitors: ns t ns ns t t t APD PHL PLH APD 96 2 ) 0 . 100 0 . 92 ( 2 ) ( = + = + = For out V , MHz f ns ns t t f r f 139 . 5 ) 0 . 95 0 . 93 ( 1 ) ( 1 max max = + = + = For in V , MHz f ns ns t t f r f 291 . 5 ) 100 89 ( 1 ) ( 1 max max = + = + = Performing calculations for the 390pF capacitors ( out V ): ns t ns ns t t t APD PHL PLH APD 258 2 ) 274 242 ( 2 ) ( = + = + = MHz f ns ns t t f r f 5174 . 1 ) 344 315 ( 1 ) ( 1 max max = + = + = As seen by the difference in the values of the APD t increased when the capacitors were replaced from 100pF to 390pF, respectively, physically agreeing because the Question 2: (Part a): Derive a differential equation for in V by applying KCL. Recall that KCL involves summing the currents entering and leaving a given node. Since in V is the only node of unknown voltage you need to define the currents going through the capacitors and resistor as
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ECE 206 - Write-up Lab 7 - CMOS Transient Analysis...

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