PLL Breadboard Issues
in [Design]
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From: Chris on 18 Mar 2010 22:00 On Mar 2, 4:02 pm, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My-Web- Site.com> wrote: > On Sun, 28 Feb 2010 07:25:56 -0800 (PST), Chris > > <christopher.man...(a)gmail.com> wrote: > >I bread boarded my PLL yesterday. I was able to get it to lock just > >fine on a multivibrator running at 33Hz. I was able to solve the > >jitter problem by using a very large value for C1 (1000u). However, > >when I attached my cameras to the loop, (one running at 22.2fps and > >the other running at 25fps) the loop would lock at a frequency > >slightly above the camera speed ~39Hz. The camera has a contact that > >closes ~5ms every frame advance. I tried using the contact to pull to > >ground, and to pull to rail. I got the same result either way. Any > >suggestions? > > >Thanks, > >ChrisManess > > Take a look at the following solutions to severely bouncing inputs... > > http://analog-innovations.com/SED/AlternatingEdge.pdf > > http://analog-innovations.com/SED/AlternatingEdge-Unobtanium.pdf > > ...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 athttp://www.analog-innovations.com| 1962 | > > I love to cook with wine. Sometimes I even put it in the food. My parts came today. I tried my design, and it locks solid on the right frequency finally. The new loop filter is awesome. Kudos to Helmut for his damped loop filter. Also, my NE555 debounce circuit fixed the frequency error problem. Yaaaah! @Jan I will be trying your design next and see how it compares to mine in lock time. Thanks All Chris Maness |