Detecting the peak value
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From: john1987 on 29 Jul 2010 15:03 I think that I am doing what are suggesting to use the differeniator. But is there another analog way to do it meant without using the RC circuit.
From: Jim Thompson on 29 Jul 2010 15:38 On Thu, 29 Jul 2010 12:03:46 -0700 (PDT), john1987 <conphiloso(a)hotmail.com> wrote: >I think that I am doing what are suggesting to use the differeniator. >But is there another analog way to do it meant without using the RC >circuit. You have an integrator (of sorts). I don't know of any way to find a sinusoid's peak without using a capacitor or a tracking A-to-D. This seems to work pretty well... http://analog-innovations.com/SED/PeakFinder_2.pdf "U1" is a comparator. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Spice is like a sports car... Performance only as good as the person behind the wheel.
From: john1987 on 29 Jul 2010 15:48 Hi, Can you give some advice about how to use tracking A/D option to do this? Thanks John
From: Phil Hobbs on 29 Jul 2010 15:51 john1987 wrote: > > Hi, > Thanks for your response. I need analog or digital solution to > implement it. I have doe search on peak detector on the internet and > found many circuits. But I need something that can do what I mentioned > in the diagram. Ideally with out those capacitor and resistor. If you > can direct me in correct way than I wil be thankful. > > John One method is to use a track/hold and a comparator--you put the T/H in track mode when its output is less than its input, and in hold mode otherwise. Of course that's also an RC in disguise, but it does have the advantage of storing the peak value for you to use elsewhere. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: Jim Thompson on 29 Jul 2010 16:03
On Thu, 29 Jul 2010 12:48:50 -0700 (PDT), john1987 <conphiloso(a)hotmail.com> wrote: >Hi, > >Can you give some advice about how to use tracking A/D option to do >this? > >Thanks > >John That's Fields area of expertise. He uses such off-the-shelf devices. I don't, I design microchips, so I don't keep up with what's available. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Spice is like a sports car... Performance only as good as the person behind the wheel. |