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Author Topic: Fixed frequency synthesizer IC  (Read 2864 times)
K8AI
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Posts: 58




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« on: October 29, 2010, 01:59:15 PM »

Anyone know of a simple IC out there that can be used for generating a single frequency in the VHF or UHF range? I'd like to find something suitable for a transverter LO. Thanks.

Curt, K8AI
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WB6BYU
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Posts: 13284




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« Reply #1 on: October 29, 2010, 03:05:41 PM »

The ICS525 programmable clock oscillator is often used as a fixed-freqeuncy transmitter in the 2m band.
The frequency is set by a set of control pins in conjunction with a (non-critical) crystal in the HF range.
The phase noise may be excessive for your application unless the crystal frequency and divide ratio are
chosen with care.

The earlier ICS505(?) was PLL that operated as a x8 multiplier.

There are a number of synthesizer chips that are designed for the LO in a TV, for example, where the steps
between output frequencies are rather large (6 MHz), but I don't remember any specific part numbers of
the ones I've looked at.
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K8AI
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« Reply #2 on: October 30, 2010, 07:54:11 AM »

Thanks for the info. Yep, I'd have to look for a low phase noise circuit for use in a transverter. I'm looking at a VSAT converter in front of me that uses a PLL circuit with a MB506 prescaler and VCO-in-a can type VCOs. I do have a couple of wide-band VCO modules in my junk box that I would think I could use in such a circuit. Now, I guess I'd have to come up with a loop filter design. I think I need a PLLs for dummies book or something.
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NI3S
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Posts: 67




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« Reply #3 on: November 01, 2010, 09:39:53 PM »

http://www.cbcintl.com/pllbook.htm

Perhaps this has your info? 

(I'm not affiliated in any way with anyone that's even read this book)
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