| ??? 10/07/05 11:01 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#102072 - Interference due to sitting in same p. Responding to: ???'s previous message |
Robert said:
I'll give it a try and let you know how it works. When working with PLL 74HC4046 there's a nice trick to improve jitter, which comes from interference due to the fact, that comparator and VCO are sitting in the same package and are unsanely coupled because of hanging on the same noisy VCC pin: Take two such chips, while using the comparator from the one and using the VCO from the other. Use also independent RLC filtering for both supply pins, then working with these PLL chips is a joy. Kai |
| Topic | Author | Date |
| MCU based VCO ?? | 01/01/70 00:00 | |
| VCO | 01/01/70 00:00 | |
| Right. | 01/01/70 00:00 | |
| There you go again | 01/01/70 00:00 | |
| Continous Current.... | 01/01/70 00:00 | |
| Acronyms away ! | 01/01/70 00:00 | |
| Thanks.... | 01/01/70 00:00 | |
| I can answer that | 01/01/70 00:00 | |
| CC ?? yes yes | 01/01/70 00:00 | |
| Of course.... | 01/01/70 00:00 | |
| maths | 01/01/70 00:00 | |
| More details needed | 01/01/70 00:00 | |
| Answers... | 01/01/70 00:00 | |
| 74HC4046 at Vcc=6V | 01/01/70 00:00 | |
| Sounds nice... | 01/01/70 00:00 | |
Interference due to sitting in same p. | 01/01/70 00:00 |