Re: what adc to use for digital am receiver

On Apr 21, 2:43 pm, Bob <b...@xxxxxxxxxxxxxx> wrote:
On Apr 21, 10:07 pm, Bhargav <bhargavall...@xxxxxxxxx> wrote:



On Apr 21, 3:06 pm, linnix <m...@xxxxxxxxxxxxxxxxxx> wrote:

On Apr 21, 12:00 pm, Bhargav <bhargavall...@xxxxxxxxx> wrote:

Hi All,

I am thinking of designing a digital am receiver, I dont know what
typical am voltage levels would be and what a/d convertor( i mean what
should be the resolution) to use for it. Can anybody help?

Thanks.

What are you trying to digitize?
Digitized tuner or digitized output?
They drives different requirements.

HI Linnix,

My radio would consist of a antenna and then a Low pass filter
(analog) to select only the AM band. After this lowpass filter I want
to use a a/d converter so that I can carry out the rest of
demodulation( like downconversion etc) digitally.

Thanks.

Peak voltage from the antenna will vary from a few tens of
microvolts to volts depending on your antenna and
how close you are to the nearest AM transmitter.

My guess is that with a 10 bit ADC it would be normal to
not have enough bits to demodulate weak stations with the
input gain at a level where strong local stations are not
clipping.

Bob

That's why you need the tuner to block the strong stations and
AGC (Automatic Gain Control) to normalize the tunned signal.
10 bits should be fine for voice. Don't expect HiFi, digital or not.

.

Relevant Pages

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