i need a micro controller for signal processing - Electronic Circuits Projects Diagrams Free

kasser · 26th February 2007, 10:08 AM

pls:
i am beginner with signal processing micro controller .
i need a micro controller for signal processing, what kind can i use .
frequency signal above 100Mhz

**Nigel Goodwin** · 26th February 2007, 10:38 AM

MicroChip make a range of DSP's, but 100MHz if far too high for such devices - perhaps you'd better tell us what you're trying to do?.

kasser · 27th February 2007, 09:52 AM

i want to work with IF frequency ,am-fm radio signals.

**Nigel Goodwin** · 27th February 2007, 09:58 AM

Quote:

Originally Posted by kasser

i want to work with IF frequency ,am-fm radio signals.

Very different frequencies, FM is normally 10.7MHz, and AM 455KHz - but what do you want to do with it?.

tanmaysathe · 27th February 2007, 10:05 AM

Are you planning to build digital filters at IF?

kasser · 27th February 2007, 10:09 AM

first:i want to replace low frequency analog part with digital part.

kasser · 27th February 2007, 10:12 AM

yes ,that denote low pass digital filters

kasser · 27th February 2007, 10:17 AM

therefore i want high speed microcontroller

**Nigel Goodwin** · 27th February 2007, 10:18 AM

The signals from the mixer are tiny, so you need to amplify them considerably anyway, and you would normally band-pass filter them during this amplification, using ceramic filters (or historically IF transformers). Attempting to use just a wideband amplifer is going to reduce performance considerably, probably to the extent it wouldn't work?.

Once you've got the amplified IF signals you could presumably then use a DSP to demodulate them? - but you're replacing a simple cheap part of the circuit with a much more complicated and expensive part.

kasser · 27th February 2007, 10:44 AM

thank you NIGEL:
that all right ,but the size becoms littler and changing its content is easir.
so i want to work with DSP.
therefore i want high speed microcontroller

**Nigel Goodwin** · 27th February 2007, 11:39 AM

Quote:

Originally Posted by kasser

thank you NIGEL:
that all right ,but the size becoms littler and changing its content is easir.
so i want to work with DSP.
therefore i want high speed microcontroller

Like I said above, check the dsPIC from MicroChip - now you've dropped your original requirement from 100MHz things become a lot more possible!.

Sceadwian · 27th February 2007, 03:40 PM

FPGA's are useful for digital 'software defined' radios. Wikipedia's entry has tons of information about it, including several active projects. They're basically high speed ADC's and DAC's hooked directly to an FPGA.

http://en.wikipedia.org/wiki/Software-defined_radio

kasser · 28th February 2007, 07:51 AM

thank you for all

kasser · 28th February 2007, 07:58 AM

Quote:

Originally Posted by tanmaysathe

Are you planning to build digital filters at IF?

yes i want to build digital filters at LF,IF.

mcs51mc · 2nd March 2007, 10:18 AM

Filters you said?

Check this one http://www.latticesemi.com/products/...isppac8081.cfm

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Latest
Good Beginner Micro Controller	psecody	Micro Controllers	54	29th January 2007 01:58 PM
PC---> Micro Controller ---> Devices HELP	firekiller51	Micro Controllers	1	25th October 2006 06:19 PM
micro controller	Emeka	Chit-Chat	1	9th December 2005 04:13 AM
micro controller projects	melodzky	Micro Controllers	3	4th July 2005 07:41 AM
Micro Controller Switcher Help	Fuad	General Electronics Chat	3	25th May 2003 07:47 AM

26th February 2007, 10:08 AM	(permalink)
kasser	i need a micro controller for signal processing pls: i am beginner with signal processing micro controller . i need a micro controller for signal processing, what kind can i use . frequency signal above 100Mhz

26th February 2007, 10:38 AM	(permalink)
Nigel Goodwin	MicroChip make a range of DSP's, but 100MHz if far too high for such devices - perhaps you'd better tell us what you're trying to do?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

27th February 2007, 09:52 AM	(permalink)
kasser	i want to work with IF frequency ,am-fm radio signals.

27th February 2007, 10:05 AM	(permalink)
tanmaysathe	Are you planning to build digital filters at IF?

27th February 2007, 10:09 AM	(permalink)
kasser	first:i want to replace low frequency analog part with digital part.

27th February 2007, 10:12 AM	(permalink)
kasser	yes ,that denote low pass digital filters

27th February 2007, 10:17 AM	(permalink)
kasser	therefore i want high speed microcontroller

27th February 2007, 10:18 AM	(permalink)
Nigel Goodwin	The signals from the mixer are tiny, so you need to amplify them considerably anyway, and you would normally band-pass filter them during this amplification, using ceramic filters (or historically IF transformers). Attempting to use just a wideband amplifer is going to reduce performance considerably, probably to the extent it wouldn't work?. Once you've got the amplified IF signals you could presumably then use a DSP to demodulate them? - but you're replacing a simple cheap part of the circuit with a much more complicated and expensive part. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

27th February 2007, 10:44 AM	(permalink)
kasser	thank you NIGEL: that all right ,but the size becoms littler and changing its content is easir. so i want to work with DSP. therefore i want high speed microcontroller Last edited by kasser; 27th February 2007 at 11:03 AM.

27th February 2007, 03:40 PM	(permalink)
Sceadwian	FPGA's are useful for digital 'software defined' radios. Wikipedia's entry has tons of information about it, including several active projects. They're basically high speed ADC's and DAC's hooked directly to an FPGA. http://en.wikipedia.org/wiki/Software-defined_radio __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

28th February 2007, 07:51 AM	(permalink)
kasser	thank you for all

2nd March 2007, 10:18 AM	(permalink)
mcs51mc	Filters you said? Check this one http://www.latticesemi.com/products/...isppac8081.cfm