Design

CMOS analogues switch capacitance
Hi All, I am measuring capacitance in the pF range and I need to switch monitoring inputs. We can calibrate out any constant capacitance.. However The 64,000 dollar question is would you expect the input capacitances of the CMOS switch to be constant over tempreature? The devices I have looked at are t... 19 Oct 2006 13:54

FA: Motorola communications system Analyzer operator manual
Ebay Item number: 290035587177 ... 1 Oct 2006 21:53

Components Datasheets
Hey everyone, I'm trying to analyze a certain circuit but it contains two components which I was unable to find any data about, the first on is labeled "AUK R315A", I suspect this one is a SAW resonator but I'm not sure yet. And the other says "RF 64", I think this one is an ASK modulator but I'm also not sure abou... 30 Sep 2006 11:56

Jihad needs scientists
Jihad needs competent scientists in the fields of nuclear physics, chemistry and biology. Qualified scientists and engineers at the Master/Ph.D. level and above are encouraged to apply. Readiness to travel and to pass a preliminary examination is required. Anyone interested should send his anonymous CV to the ad... 30 Mar 2007 13:09

How to fix LTspice schematic
I do not understand the error message and have no clue to fix it. The inverter may be the problem; would like it to "emulate" a TPS2818 but do not know how. ... 2 Oct 2006 12:35

another semi web site shot to hell?
Can someone verify whether the National web site is truly broken? It sure looks that way to me. In addition to all sorts of snarled links and stuff, there's no obvious way I can find, say, the datasheet of an LM7824... had to go to Fairchild's site! I'm running Firefox under XP. John ... 11 Oct 2006 10:37

Motorola AN-410 wanted
Has anybody got, or know where I can get, a copy of an old Motorola App note, 410? The title is "A Unified Approach to Optimum FET Mixer Design" by Kwok. I have been Googling and searching for some time, but without success. TIA, Barry Lennox ... 11 Oct 2006 22:43

Cell phone ccd ID
I have a cell phone that stopped working and I took it apart and recovered the CCD and was wondering if it would be possible to use. I think the cell phone as a motorola RAZR or something like that. The only markings on the CCD are 8488310Y, 0339751-111, and tw0518 Q X. It has a 20 pin connector that is like ta... 18 Aug 2006 11:14

supercapacitors
Does anyone have experience with supercapacitors? What's the best way to learn more about them and what they're useful for? Any good web links with design examples? We have a 1 kW transmitter for ultrasound that uses 12 electrolytic capacitors (2200uF each) in a bank, for 26.4 mF total capacitance. The ESR is... 18 Aug 2006 11:14

divide by 25/16
Hi, I need a circuit to divide a <50mhz digital signal by 25/16. ie. i need to lose 9 out of every 25 pulses. Is there a simple/standard way to do this ? Ive come up with a few ideas that use quite a lot of logic, such as a divide the input by 25 with 1-25 decoder wich then swallows a pulse at the apropriate co... 19 Aug 2006 21:44