SLIDE 1
Introduction to ECL
INEL4207 Digital Electronics
Tuesday, September 27, 11
R Q1 Q2 IEE
- VEE
vIN VREF vC1
Current Switch
Tuesday, September 27, 11
Introduction to ECL INEL4207 Digital Electronics Tuesday, September - - PowerPoint PPT Presentation
Introduction to ECL INEL4207 Digital Electronics Tuesday, September - - PowerPoint PPT Presentation
Introduction to ECL INEL4207 Digital Electronics Tuesday, September 27, 11 Current Switch R v C1 v IN Q 1 Q 2 V REF I EE -V EE Tuesday, September 27, 11 ECL Inverter R v C1 Q 3 v IN Q 1 Q 2 V REF v O I E3 I EE -V EE Tuesday, September 27, 11
SLIDE 2
SLIDE 3
R Q1 Q2 IEE
- VEE
vIN VREF vC1 Q3 IE3 vO
ECL Inverter
Tuesday, September 27, 11
SLIDE 4
R Q1 Q2
- VEE
vIN VREF vC1 Q3 vO Q4 Q5 Q6 RCS A4 A5 A6 IEE
Current Source
Tuesday, September 27, 11
SLIDE 5
Reference Voltage
VEE=-5.2V D1 D2 R1 Q5 R3 R2
VREF
Tuesday, September 27, 11
SLIDE 6
R Q1 Q2
- VEE
vIN VREF vC1 Q3 IE3 vO REE IREE R3
- VEE2
ECL with Resistor
Tuesday, September 27, 11
SLIDE 7
R Q1 Q2
- VEE
vIN VREF vC1 Q3 IE3 vO REE IREE R3 R4
Example: Use the above circuit design an ECL gate for which VH = −1.7V and VL = −2.3V . The average power dissipation should be less that 2mW. The supply voltage is −5.2V . Neglect the base currents.
Tuesday, September 27, 11
SLIDE 8
RC1 Q1A Q2 IEE
- VEE
VREF vC1 Q3 A+B A B
- VEE2
- VEE2
A+B Q4 RE RE Q1B RC2 vC2
ECL-NOR Gate
Tuesday, September 27, 11
SLIDE 9
- 1. For the ECL inverter shown in the following sketch, the high voltage level is VH = −1.7V and
the average power dissipated when the input is high 50 % of the time is P = 5mW. Determine the source’s current IEE, the low voltage level VL, the reference voltage level VREF and the value of resistance R3.
- 5.2V
- 3.3V
VREF vin 2k 2k IEE Q1 Q2 Q3 vout R3
Tuesday, September 27, 11
SLIDE 10
- 2. Find VL, VH and VREF for the following circuit. Neglect base currents and assume
VBE = 0.7V if a transistor is ON. (25 points)
- 2V
- 5V
1k! 1k! VREF vIN vOUT 4k! Q1 Q2
Tuesday, September 27, 11