The Next Generation GHz TTL / CMOS Technology

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.

Posted by potatosemi at 01:55 PM | Permalink | Comments (0)

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.

Posted by potatosemi at 08:54 AM | Permalink | Comments (0)

First one is adding shielding materials.

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.

Posted by potatosemi at 02:44 PM | Permalink | Comments (0)

CMOS technology has been widely used for more then 40 years. It delivers the low cost with high yield. However, because of the unbalanced CMOS structure, it will generate high noise into Power & ground.

Continue reading "High frequency low noise CMOS output driver" »

Posted by potatosemi at 02:22 PM | Permalink | Comments (0)