# Circuit Simulator - ECL NOR/OR

## Where can I get ECL NOR/OR Circuit Diagram with Explanation?

IndiaBIX provides you lots of fully solved ECL NOR/OR circuit diagram with detailed explanation and working principles.

## How to design a ECL NOR/OR (electronic circuit)?

You can easily design the ECL NOR/OR circuit by practicing the exercises given below. Here you can design and simulate your own electronic circuits with this Online Circuit Designer and Simulator.

### Circuit Description:

This is a NOR/OR gate using emitter-coupled logic, a high-speed type of logic using transistors. The two inputs are shown at left. If either one of them is high (-700 mV), then the OR output is high, and the NOR output is low. If they are both low (-1.4V), then the OR is low, and NOR is high.

Q3's base voltage is fixed at a level where there is enough base current to get Q3 to conduct. This brings Q3's collector down to about 740 mV, which brings the OR output low (through a follower attached to Q3's collector). Q3's emitter is high enough relative to Q2's base that Q2 can't conduct, so Q2's collector stays at ground. This keeps the NOR output high (through a follower).

If either of the two inputs is high, then the corresponding transistor conducts. This brings Q1/Q2's collector low, which brings the NOR output low. It also brings Q1/Q2's emitter high enough so that Q3 can't conduct, which brings the OR output high.

The advantage of ECL is speed, because the transistors are never in saturation. They are either in cutoff or forward-active mode; transistors can switch between these two states quickly. The disadvantage is that there is always a lot of current, and therefore power consumption. -- Credits: Mr. Paul Falstad.

 Abraham Cruz said: (Oct 29, 2013) ECL OR/NOR 10k Start Simulation -> Right Click in black background -> File -> Import Paste the next code: \$ 1 5.0E-6 0.15814360605671443 57 1.5 58 t 48 240 96 240 0 1 -1.3996969255223835 0.3937782725122714 100.0 t 128 240 176 240 0 1 -1.3996969255223835 0.3937782725122714 100.0 w 96 224 96 192 0 w 96 192 176 192 0 w 176 192 176 224 0 w 96 256 96 288 0 w 96 288 176 288 0 w 176 288 176 256 0 r 208 288 208 384 0 779.0 w 176 288 208 288 0 w 208 288 240 288 0 t 288 240 240 240 0 1 -0.12092380884506992 0.6125220310745478 100.0 w 240 256 240 288 0 w 240 224 240 144 0 w 176 192 176 112 0 r 176 112 176 48 0 220.0 r 240 48 240 112 0 245.0 w 240 112 240 144 0 t 336 192 288 192 0 1 -0.6144523388444751 0.5668039025932483 100.0 w 288 208 288 240 0 w 288 176 288 48 0 w 336 192 336 112 0 r 336 48 336 112 0 907.0 w 336 48 288 48 0 w 288 48 240 48 0 w 240 48 176 48 0 d 336 192 336 240 1 0.805904783 d 336 240 336 288 1 0.805904783 r 336 288 336 384 0 4980.0 w 240 144 384 144 0 w 176 112 448 112 0 t 384 144 416 144 0 1 -1.0603324325926535 -2.9666170580089357E-5 100.0 w 416 160 416 240 0 w 416 128 416 48 0 t 448 112 480 112 0 1 -3.030744776164572E-4 -3.5722768018886736E-7 100.0 w 416 48 480 48 0 w 480 48 480 96 0 w 480 128 480 208 0 r 288 288 288 384 0 6100.0 w 208 384 288 384 0 w 288 384 336 384 0 w 176 48 128 48 0 g 128 48 128 80 0 L 48 240 48 144 0 0 false -0.7 -1.4 L 128 240 128 144 0 0 false -0.7 -1.4 M 480 208 528 208 0 -1.0 M 416 272 528 272 0 -1.0 x 515 191 542 194 0 12 NOR x 518 255 536 258 0 12 OR w 416 240 416 272 0 w 288 288 288 240 0 x 59 278 80 282 0 16 Q1 x 146 278 167 282 0 16 Q2 x 212 246 233 250 0 16 Q3 r 48 240 48 384 0 50000.0 r 128 240 128 384 0 50000.0 w 208 384 128 384 0 w 128 384 48 384 0 R 480 48 528 48 0 0 40.0 0.0 0.0 0.0 0.5 R 336 384 384 384 0 0 40.0 -5.2 0.0 0.0 0.5