I expected the 1:4 might be slightly slower due to the larger fan
out internal to the buffer than for the 1:2. However, I expected
that since the
1:2 package heavily favors the GND return path, that the fall time
would be much faster than the rise time, contrary to the
measurements.

The 1:10 measured at 272ps rise and 264ps fall, slightly slower
still, but very symmetrical edges.

Thank you,

------/ --/ -----/ -----/IBM@IBMUS

Drive 50 Ohm load
Drive 50 Ohm load

Regular TTL logic

Advantage

1. Easy to use.
2. Only need decupling capacitor. No extra component is needed.
3. No static current.

Disadvantage

1. High Noise
2. Low operating frequency
3. High jitter.
4. High Propagation Delay
5. Week output signal
6. Signal is not able to run through cable.

ECL logic

Advantage

1. Run high frequency.
2. Low noise.
3. Low jitter.
4. Output signal can run through cable.

Disadvantage

1. Difficult to use.
2. Need many extra components such as 50 ohm loading resistors.
3. Need two wires to represent one bit.
4. High static current.
5. Burn electricity power when the system is idle. Waste energy.

The Next Generation GHz TTL Logic
(PotatoSemi Technology)

Advantage

1. Strong output signal.
2. Run high frequency.
3. Low noise.
4. Low jitter.
5. Output signal can run through cable.
6. Only one wire for one bit
7. Easy to use.
8. Embedded decupling capacitor.
9. Power up and run. No extra component is needed.
10. No static current. Do not waste power. Power saving. Environment friendly.

Regular Clock Buffer

Advantage
1. Easy to use.
2. Clock source is from crystal oscillator.
3. Only need decupling capacitor. No extra component is needed.
4. No static current.

Disadvantage
1. High Noise.
2. Low operating frequency.
3. Large Propagation Delay.
3. High jitter.
4. Week output signal.
5. Signal is not able to run through cable.

Zero Delay Clock Buffer

Advantage
1. Zero Delay.

Disadvantage
1. Shift clock source from crystal oscillator to PLL local oscillator.
2. High Noise.
3. Low operating frequency.
4. High jitter.
5. Week output signal.
6. Signal is not able to run through cable.

ECL Clock buffer

Advantage
1. Small propagation delay.
2. Clock source is from crystal oscillator.
3. Run high frequency.
4. Low noise.
5. Low jitter.
6. Can run through cable.

Disadvantage
1. Difficult to use.
2. Need many extra components such as 50 ohm loading resistors.
3. Need two wires to represent one bit.
5. Waste PCB space.
5. Current source design. High static current.
6. Burn electricity power when the system is idle. Waste energy.

The Next Generation GHz CMOS Clock Buffer
(PotatoSemi Clock Buffer)

Advantage
1. Small propagation delay.
2. Clock source is from crystal oscillator.
3. Strong output signal.
4. Run high frequency.
5. Low noise.
6. Low jitter.
7. Can run through cable.
8. Only one wire for one bit.
9. Easy to use.
10. Embedded decupling capacitor.
11. Power up and run. No extra component is needed.
12. Voltage source design. No static current.
13. Do not waste power. Power saving. Environment friendly.

I just want to thank your company for making this product. We will
seriously be looking at your other products to see how we can use them
in existing and future products.

Lastly, if you want to send us some literature on how you pulled this
off I would be very interested. I would also appreciate any Spice
models if you have any available. They can be pseudo models as long as
their transmission line properties are retained.

Thanks,

--
Chase Scientific Company

Advantage:
It will seal the radiation inside your system.

Disadvantage:
high cost.

Second one is to use spread spectrum oscillator.

Advantage:
lower down the EMI with low extra cost.

Disadvantage:
Using spread spectrum means adding jitter. It is going to increase your system bit error rate. It may cause the system failure.
We have this kind of experience with one of our customer.

The third one is using high frequency & high performance crystal oscillator or ICs.

Advantage:
This kind of products are low noise inside, so they can run into high frequency & usually generate much less radiation. All of our products are designed with extremely low noise & high frequency. The EMI radiation is from the sum of all the ICs inside your system. By carefully choosing driver ICs such as crystal oscillator, clock buffer, TTL logic etc. can reduce the total EMI radiation from your system.

Disadvantage:
If the high radiation is from the main chip that you are not able to change, you will not be able to fix your EMI problem.

Potato Semiconductor Corporation is a fabless IC design house which locates in San Jose, California. With our powerful leading technology in IO interface, logic cells & unique design rule, we can improve most of existing standard logic chips into higher speed ones. The chips will become much more reliable, with much less noise and much higher operating frequency than the same devices from other Semiconductor companies. Take a look at our products and do the comparison yourself. When you compare them apple to apple, you will find out that our chips can run much faster with much higher frequency then the others.

What We Do
By using our special IO interface, logic cells & design rule, we can convert most of existing Logic chips into much higher frequency than it was before. We will continue to convert existing standard chips to become the chips which are much more reliable, much less noise and much higher running frequency