Designing a VCO

Oct 24, 2005 12 Replies
J

Buy either an MC1648 VCO (sine wave) or MC1658 VCM (square wave), both designed by yours truly.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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O

Higher then 109 MHZ is international air navigation band ANYWHERE in the world.

109-138 is the air band range. Sorry if your using high side injection.

Steve Roberts

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M

Hello everyone!!



Well, Im doing a project which requires a VCO in my circuits, the problem is im not able to design the one i need (the VCO should oscillate between



85MHz and up to 125MHz only, since these are the allowed free channels) can anyone suggest me a design? ty


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J

It's my MC1648 schematic with a bias modification to match 100K TC, and processed on 100K.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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R
108-117.975 - Navigation 118-136.975 - Communications

So what if he is using high side? The device is still required to meet part

15 spurious which should limit the range safely.

Jim

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J

Yes, I've spread a bit of it around ;-)

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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R

Is the original plain-jane variety still being produced?

Jim

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J

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makes it. They still make quite a few of my '60's designs.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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D

MiniCircuits

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makes a line of VCO modules; their model POS-150 would fit exactly within your range.

Freq Range 75-150 MHz Output level +9.5 dbm Tuning voltage 1-16 VDC

Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Never take a laxative and a sleeping pill at the same time!!
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J

Hello Jim,

Arrow doesn't carry those anymore and ON Semi draws a blank, too.

But the 1648 now comes with a Porsche engine, MC100EL1648. It's a rocket at 1.1GHz and a surprisingly low supply current under 25mA. Did you design that one as well?

Regards, Joerg

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J

Hello Jim,

I guess legally you'd still be the father then because your DNA is in there.

Regards, Joerg

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R

"Mounir" a écrit dans le message de news: ZoKdncuRcofRvMDeRVn snipped-for-privacy@giganews.com...

For these frequencies why not using a DDS and not a VCO/PLL ?

Friendly, RObert

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