In Reply to: I would say all three posted by John Escallier on December 10, 2002 at 14:45:29:
Parallel termination is typically low-impedance driver driving Zo cable to Zo load. There are no reflections from the load back to the driver. I have designed plenty of these types of systems. Point-to-point is the simplest.As I said, a driver impedance of Zo will half the voltage at the load. Very few systems use this technique because it reduces the signal to noise ratio and changes the voltage swing at the load.
In microprocessor buses, such as the front-side-bus in Pentium systems (GTL+), the bus is multi-master, so each driver must have a terminator as well. The drivers are always 7-10 ohms, the bus and the terminators are 50-70 ohms Zo. About 10X difference.
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Follow Ups
- nope, trust me - audioengr 19:43:05 12/10/02 (22)
- eerr.... WHAT frequency, dudes and dudettes? - jj 01:27:21 12/13/02 (5)
- 15 nsec rise-times, ~333nsec period. - audioengr 16:47:18 12/14/02 (0)
- Re: eerr.... WHAT frequency, dudes and dudettes? - john curl 10:04:56 12/13/02 (3)
- Happy Holidays - John Escallier 11:31:38 12/13/02 (2)
- Sure, I've done it. - audioengr 16:50:26 12/14/02 (0)
- Re: Happy Holidays - john curl 11:28:35 12/14/02 (0)
- Re: nope, trust me - John Escallier 11:41:45 12/11/02 (5)
- Re: nope, trust me - audioengr 19:59:13 12/11/02 (0)
- Re: nope, trust me - Tom N. 12:30:57 12/11/02 (3)
- diodes - audioengr 20:05:41 12/11/02 (0)
- Re: nope, trust me - Dan Banquer 17:49:52 12/11/02 (0)
- Re: nope, trust me - John Escallier 12:40:08 12/11/02 (0)
- Re: nope, trust me - Dan Banquer 05:24:17 12/11/02 (9)
- huh? - audioengr 10:17:59 12/11/02 (8)
- Re: huh? - Dan Banquer 12:33:16 12/11/02 (7)
- Re: huh? - Monstrous Mike 20:08:34 12/11/02 (5)
- Transmission-line theory - audioengr 19:35:42 12/12/02 (0)
- Re: huh? - Dan Banquer 05:34:11 12/12/02 (3)
- 44.1 kHz - audioengr 19:37:33 12/12/02 (2)
- Re: 44.1 kHz - Monstrous Mike 11:13:32 12/13/02 (1)
- That is the data rate for one channel. - Penguin 13:06:22 12/14/02 (0)
- SP/DIF - audioengr 19:49:45 12/11/02 (0)