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Kai Klaas
01/12/06 07:20
Modified:
  01/12/06 07:22

Read: 1879 times
Germany


 
#107138 - I would try this
Responding to: Kai Klaas's previous message
Kai said:
If you want to handle a signal range of 0.01V to 5V in 1:2:5 steps, as it is common practice with standard scopes, then you need three separate dampening paths in parallel at input of FET-buffer, which provides a dampening of 1, 10 and 100.

I would try the following scheme:



Kai

List of 87 messages in thread
TopicAuthorDate
20Mhz Analog Input of a DSO      Farshid Jafari Harandi      01/05/06 15:26      
   Link      Kai Klaas      01/06/06 05:43      
      why go for 20MHz      Erik Malund      01/06/06 07:07      
         No 4 layer PCB & faster ADC available      Farshid Jafari Harandi      01/07/06 03:56      
      Initial look ...      Farshid Jafari Harandi      01/07/06 03:51      
         Trigger Circuit      Farshid Jafari Harandi      01/07/06 07:55      
            Try of explaination      Kai Klaas      01/07/06 14:21      
               Badly drawn      Steve M. Taylor      01/07/06 14:47      
               Trigger and Amp      Farshid Jafari Harandi      01/07/06 17:18      
                  Take care...      Kai Klaas      01/07/06 18:26      
                     Speed      Steve M. Taylor      01/08/06 05:32      
                        Like This ?      Farshid Jafari Harandi      01/08/06 07:52      
                           Just wait...      Steve M. Taylor      01/08/06 09:12      
                              so what do they do there ?      Farshid Jafari Harandi      01/08/06 10:29      
                                 Direct Digital synthesis      Steve M. Taylor      01/08/06 10:51      
                                    I just can think about one benefit      Farshid Jafari Harandi      01/08/06 13:09      
                     Searching...      Farshid Jafari Harandi      01/08/06 07:44      
                        Misinterpretation      Kai Klaas      01/09/06 06:20      
                           Proper Op-Amp      Farshid Jafari Harandi      01/09/06 16:49      
                              AD844 has 50 Ohm input resistance on -      Frieder Ferlemann      01/10/06 02:04      
                                 inverting input resistance      Farshid Jafari Harandi      01/10/06 09:05      
                              specifications      Kai Klaas      01/10/06 07:24      
                                 sampling      Farshid Jafari Harandi      01/10/06 09:14      
                                    Of course      Kai Klaas      01/10/06 09:27      
                                       Yes but      Steve M. Taylor      01/10/06 14:53      
                                          Exactly!      Kai Klaas      01/11/06 06:15      
                                 Preamp Initial Schematic      Farshid Jafari Harandi      01/10/06 21:18      
                                    please resubmit the schematic in a forma      Erik Malund      01/11/06 06:24      
                                       Real size button      Kai Klaas      01/11/06 06:39      
                                          not quite good enough      Erik Malund      01/11/06 06:53      
                                             Higher Resolution      Farshid Jafari Harandi      01/11/06 07:17      
                                       Resize      Farshid Jafari Harandi      01/11/06 06:56      
                                          I do not care if it fits, I can move it      Erik Malund      01/11/06 07:21      
                                             readable with gthumb      Frieder Ferlemann      01/11/06 08:17      
                                             They are1N4148s      Farshid Jafari Harandi      01/11/06 08:18      
                                             Problem is at your end      Ian Bell      01/11/06 12:04      
                                                do you refer to the first submit      Erik Malund      01/11/06 12:09      
                                                   Web Browser      Steve M. Taylor      01/11/06 13:28      
                                                   Both      Ian Bell      01/11/06 14:17      
                                    Some changes needed      Kai Klaas      01/11/06 19:05      
                                       have to sleep a little ,will post later      Farshid Jafari Harandi      01/11/06 22:19      
                                       I would try this      Kai Klaas      01/12/06 07:20      
                                          not an analog eagle      Erik Malund      01/12/06 07:34      
                                             Why not      Kai Klaas      01/12/06 07:58      
                                                not objecting, just wondering      Erik Malund      01/12/06 08:31      
                                          Updated Schematic      Farshid Jafari Harandi      01/12/06 13:21      
                                             FETs      Farshid Jafari Harandi      01/12/06 13:39      
                                                I remember going to the races on Thursda      Erik Malund      01/12/06 13:45      
                                                   Yes, Nowadays they're held at friday      Farshid Jafari Harandi      01/12/06 14:13      
                                             Answers      Kai Klaas      01/12/06 19:01      
                                                JFET Input good      Farshid Jafari Harandi      01/12/06 21:30      
                                                   Deviations      Kai Klaas      01/13/06 07:06      
                                             Answers II        Kai Klaas      01/13/06 06:53      
                                                Corrected mistakes      Farshid Jafari Harandi      01/13/06 10:31      
                                                   Answers III      Kai Klaas      01/13/06 17:44      
                                                      RE : Answers III      Farshid Jafari Harandi      01/13/06 19:05      
                                                      new questions about PCB/Supply      Farshid Jafari Harandi      01/13/06 20:48      
                                                         Answers IV        Kai Klaas      01/14/06 07:22      
                                                            RE : Answers IV      Farshid Jafari Harandi      01/14/06 12:29      
                                          How do adjust the cap trimmers?      Kai Klaas      01/15/06 18:06      
                                             Thanks for everything      Farshid Jafari Harandi      01/16/06 02:29      
                     Found these      Farshid Jafari Harandi      01/08/06 13:06      
            inductance      Kai Klaas      01/10/06 09:39      
               Relays      Farshid Jafari Harandi      01/10/06 21:24      
                  Reed-relay        Kai Klaas      01/11/06 07:57      
                     Reed Relays      Farshid Jafari Harandi      01/11/06 08:19      
         Plays no significant role      Kai Klaas      01/07/06 13:59      
            but they are sensitive      Erik Malund      01/09/06 10:36      
               Analog Mux      Farshid Jafari Harandi      01/09/06 16:42      
                  today Philips announced this MUX      Erik Malund      01/10/06 07:21      
                  Strac capacitance make the worse      Kai Klaas      01/10/06 09:22      
                     Sorry, stray not strac      Kai Klaas      01/10/06 09:23      
   a better aproach maybe      Jez Smith      01/12/06 08:27      
      PLD question      Farshid Jafari Harandi      01/12/06 14:15      
         Re PLD questions      Jez Smith      01/12/06 15:57      
            link      Jez Smith      01/12/06 16:05      
            Go for CPLD or not !      Farshid Jafari Harandi      01/12/06 20:28      
               Not in that timescale      Jez Smith      01/13/06 00:22      
                  so about 10K gates are needed ?      Farshid Jafari Harandi      01/13/06 12:46      
                     part numbers      Jez Smith      01/14/06 01:10      
                        Wow pretty expensive !      Farshid Jafari Harandi      01/14/06 02:18      
                  I'll have to wait till tommorow      Farshid Jafari Harandi      01/13/06 13:09      
   is this helpful?      Erik Malund      01/12/06 14:25      
      good link      Farshid Jafari Harandi      01/12/06 20:22      
   Heres a start      Jez Smith      01/13/06 00:59      
   'must read'        Rob Klein      01/14/06 07:25      
      What a great reference !      Farshid Jafari Harandi      01/14/06 12:33      

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