Filter Design Software

Pull down Zverev. ;)

Cheers

Phil Hobbs

-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203 Briarcliff Manor NY 10510

hobbs at electrooptical dot net

On 1/27/2015 11:33 AM, Jim Thompson wrote: > I need a filter with the following specs: > > Center frequency: 2MHz > Nose Bandwidth (-3dB): 20kHz > -60dB Bandwidth: 40kHz > > Cauer/Elliptic type would be fine > > Need: Pole locations, A+jB, Zero locations. > > The free software out there won't do more than third order. > > ...Jim Thompson >

-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203 Briarcliff Manor NY 10510

hobbs at electrooptical dot net

...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

[snip]

My copy is still in a moving box somewhere :-( ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| San Tan Valley, AZ 85142     Skype: skypeanalog  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

Pan (or Giganews) keeps not posting my replies -- here it is again with the "reply-to" list trimmed:

That's asking for some awfully high Q resonators (certainly Q > 100). I think you're outside of what you can do with coils, and into crystal filter territory.

A custom crystal filter is going to be big, heavy, and expensive in engineering time, parts, and alignment time. That's assuming you can find someone who'll make it for you, because these days if you have a task like that it's done with DSP.

You may be able to find an off-the-shelf filter that has the bandwidth and shape factor you need but not at 2MHz carrier frequency, in which case you can build a superheterodyne radio and either take your output at the radio's IF, or have the thing regenerate signal back at 2MHz.

DSP, using today's components, will be smaller, lighter, quicker and cheaper -- the only thing it won't be is less power hungry, and depending on what you need around your filter, the cost of using DSP may not be all that great.

--
www.wescottdesign.com

I find,

get the transfer function yourself. ;)

Tim

-- Seven Transistor Labs Electrical Engineering Consultation Website:

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

Jim, you still need this filter? Tonne Software's Elsie will give you 5 or 6 orders for the freebie version. Julian