IQ demodulator specifications

Started by jmariano in sci.electronics.design7 years ago 3 replies

Hi All, What is the meaning of "operation LO power 10 +/- 0.5 dBm" on the data sheet of a minicircuits I&Q demodulator (MIQC-60WD)? What...

Hi All, What is the meaning of "operation LO power 10 +/- 0.5 dBm" on the data sheet of a minicircuits I&Q demodulator (MIQC-60WD)? What would be the result of using a LO power 1dB off, say 11 dBm? Tanks


Precision synchronous demodulator

Started by Spehro Pefhany in sci.electronics.design4 years ago 49 replies

What's a good approach for use at 1MHz, give or take 2:1? Things like the AD630 are slow, and my usualy go-to approach (Gilbert Cell balanced...

What's a good approach for use at 1MHz, give or take 2:1? Things like the AD630 are slow, and my usualy go-to approach (Gilbert Cell balanced demodulator with LO > > Vt) has input referred drift and offset typically in the ~1uV/K and a couple mV. I'd like both to be better by at least an order of magnitude, and preferably with some gain like the Gilbert cell things, which have 15-20dB of ga


HD Video Specs.?

Started by Jim Thompson in sci.electronics.design3 years ago 23 replies

Can someone direct me to some specifications for HD video? I've had an inquiry regarding an HD video demodulator (FM), I'm zeroing out with...

Can someone direct me to some specifications for HD video? I've had an inquiry regarding an HD video demodulator (FM), I'm zeroing out with Google (probably not the right search buzz words). Thanks! ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et...


Re: IR Receiver/Demodulator

Started by Hammy in sci.electronics.design7 years ago 4 replies

On Thu, 18 Mar 2010 22:30:24 -0000, "markp" wrote: > > > It does, but maybe you'd rather not do it. The RFM12B is available at...

On Thu, 18 Mar 2010 22:30:24 -0000, "markp" wrote: > > > It does, but maybe you'd rather not do it. The RFM12B is available at about > $2.10 in 1000off and has already been compliance tested, it lowers risk that > the final product is compliant. You'd still need the BOM parts with the > MRF49X in addition to the chip and get them placed on the PCB. In larger


Re: IR Receiver/Demodulator

Started by Hammy in sci.electronics.design7 years ago 7 replies

On Thu, 18 Mar 2010 16:54:38 -0700, Joerg wrote: > > He needs 80ft. Then he is going to have to collimate the IR emitter and use...

On Thu, 18 Mar 2010 16:54:38 -0700, Joerg wrote: > > He needs 80ft. Then he is going to have to collimate the IR emitter and use an optical filter optimized for his wavelength on the detector. It would also be very directional. > > They use IR for laser tag. I don't know what the military uses I'm > > guessing IR as well for their war games. These are used du


Demod PC Generated ELF

Started by Robert Davis in sci.electronics.design8 years ago 10 replies

I would like to use commercial software to generate complex sub-audio waveforms. Obviously, these cannot be output directly from the soundcard....

I would like to use commercial software to generate complex sub-audio waveforms. Obviously, these cannot be output directly from the soundcard. So I am planning to have them amplitude modulate an audio sinewave and then apply the composite signal to a demodulator external to the PC to recover the sub-audio waveform. Can anyone please provide advice regarding the best design practice for th...


Need U.S. domestic source for MC145447 Caller ID chip

Started by George in sci.electronics.design6 years ago 2 replies

I need to replace an MC145447P Caller ID demodulator chip that has lost it's smoke. The part is long out of production, and neither Digikey...

I need to replace an MC145447P Caller ID demodulator chip that has lost it's smoke. The part is long out of production, and neither Digikey nor Mouser have any. Can anyone suggest where I could find this chip? Or does anyone remember a particular phone or Caller ID box that used it? Maybe I could scanvenge one.


DPSK oscillator quality

Started by Henry Kiefer in sci.electronics.design10 years ago 11 replies

Hi folks! At the moment I'm designing a DPSK transmission system. The question is how much bit-error-rate I get dependent on the actual...

Hi folks! At the moment I'm designing a DPSK transmission system. The question is how much bit-error-rate I get dependent on the actual difference of oscillator frequency =f(transmitter)-f(receiver). I'm using a costas-loop demodulator. I think this is one of the best algorithms/strategies. Does somebody know a good practical oriented paper/link on this theme? I googled without luc...


Detector question on lock-in circuits

Started by Anonymous in sci.electronics.design3 years ago 1 reply

I see demodulator circuits that to me look like a full wave rectifier, they take an AC signal and flip its negative part above the line. This is...

I see demodulator circuits that to me look like a full wave rectifier, they take an AC signal and flip its negative part above the line. This is the last stage of a lock-in before the integration-cleanup phase. In situations where you control the light source, I have thought of using square wave pulses, with measurements taken during 'on' and 'off' periods. It makes sense to me to subtract...


Diode Array

Started by Anonymous in sci.electronics.design3 days ago 9 replies

I'm looking for a replacement for the CA3039 diode array, which has been successfully used in a precision demodulator circuit operating up to 1...

I'm looking for a replacement for the CA3039 diode array, which has been successfully used in a precision demodulator circuit operating up to 1 MHz. The part has been obsoleted by Intersil. The important characteristics are low leakage current (less than 0.1 nA at 25C with 1 V reverse bias) and close matching of forward voltage drops. Also, the forward voltage drop with 1 nA or le


RF Audio/Video modules

Started by jozamm in sci.electronics.design6 years ago 2 replies

Hi all, I have a pair of RF video modules and need some help to identify the model and maybe get the datasheet. There were given to me by a...

Hi all, I have a pair of RF video modules and need some help to identify the model and maybe get the datasheet. There were given to me by a friend of mine. They have no identification number except for the following - The frequency is selected by 4 DIP switches at both ends - The receiver has a LMX2331 2GHz PLL and an SL1461SA PLL FM demodulator - The receiver demodulates the audio as well...


QPSK carrier frequency ??

Started by Daku in sci.electronics.design7 years ago 21 replies

Maybe this is not a good forum to ask this question, but some electronics guru please provide some suggestions to my problem ? I...

Maybe this is not a good forum to ask this question, but some electronics guru please provide some suggestions to my problem ? I am experimenting with a QPSK modulator - demodulator system, and my question is: if the data bits are arriving at 1 MHz, what would be an ideal carrier frequency ? I think the Nyquist criteria should hold, but somewhat confused. Any hints, suggestions would be of...


Re: IR Receiver/Demodulator

Started by Jim Thompson in sci.electronics.design7 years ago 2 replies

On Fri, 19 Mar 2010 08:50:01 -0700, Joerg wrote: > markp wrote: [snip] > > > > Other possibilites for the receiver might be to use a...

On Fri, 19 Mar 2010 08:50:01 -0700, Joerg wrote: > markp wrote: [snip] > > > > Other possibilites for the receiver might be to use a tube, cone or even a > > parabolic reflector made from IR reflective material. If you use the > > reflector you'd place the receiver pointing inwards at the focal point. This > > effectively produces gain as it captures power from a


IR Receiver/Demodulator

Started by eeboy in sci.electronics.design7 years ago 81 replies

I need to design an IR receiver which will demodulate IR input at a given carrier frequency (~32kHz) over distances of 60-80 feet. I am...

I need to design an IR receiver which will demodulate IR input at a given carrier frequency (~32kHz) over distances of 60-80 feet. I am not transmitting data, simply pulses of varying length (20ms-80ms). These pulses occur at the rate of approximately 1Hz. It is important that the pulse length is preserved from transmitter to receiver. In other words, if I send a 20ms pulse I expect it to be withi...


Re: IR Receiver/Demodulator

Started by Jon Kirwan in sci.electronics.design7 years ago 4 replies

On Sun, 21 Mar 2010 14:24:52 -0700, Joerg wrote: > Jon Kirwan wrote: > > On Sun, 21 Mar 2010 14:06:38 -0700, Joerg > > wrote: > > ...

On Sun, 21 Mar 2010 14:24:52 -0700, Joerg wrote: > Jon Kirwan wrote: > > On Sun, 21 Mar 2010 14:06:38 -0700, Joerg > > wrote: > > > > > > > > > But the big problem is nearly always noise--shot noise of sunlight or > > > > differentiated amplifier voltage noise. > > > Ok, true, but we'd have to quantify that. I have seen IR comms (with > > >


Re: IR Receiver/Demodulator

Started by krw...@att.bizzzzzzzzzzzz in sci.electronics.design7 years ago

On Mon, 22 Mar 2010 08:29:03 +1100, Grant wrote: > On Sun, 21 Mar 2010 14:06:38 -0700, Joerg wrote: > > > Phil Hobbs wrote: > > > On...

On Mon, 22 Mar 2010 08:29:03 +1100, Grant wrote: > On Sun, 21 Mar 2010 14:06:38 -0700, Joerg wrote: > > > Phil Hobbs wrote: > > > On 3/19/2010 11:50 AM, Joerg wrote: > > > > markp wrote: > > > > > "markp" wrote in message > > > > > news:80h62eF4g7U1@mid.individual.net... > > > > > > "Grant" wrote in message > > > > > > news:2an6q5le


Re: IR Receiver/Demodulator

Started by krw...@att.bizzzzzzzzzzzz in sci.electronics.design7 years ago

On Mon, 22 Mar 2010 06:48:17 -0700, Joerg wrote: > krw@att.bizzzzzzzzzzzz wrote: > > On Sun, 21 Mar 2010 16:48:02 -0700, Joerg ...

On Mon, 22 Mar 2010 06:48:17 -0700, Joerg wrote: > krw@att.bizzzzzzzzzzzz wrote: > > On Sun, 21 Mar 2010 16:48:02 -0700, Joerg wrote: > > > > > Grant wrote: > > > > On Sun, 21 Mar 2010 14:06:38 -0700, Joerg wrote: > > > > > > > > > Phil Hobbs wrote: > > > > > > On 3/19/2010 11:50 AM, Joerg wrote: > > > > > > > markp wrote: > > > > > > > > "


Re: IR Receiver/Demodulator

Started by JosephKK in sci.electronics.design7 years ago

On Mon, 22 Mar 2010 17:37:50 -0500, "krw@att.bizzzzzzzzzzzz" = wrote: > On Mon, 22 Mar 2010 06:48:17 -0700, Joerg = wrote: > > >...

On Mon, 22 Mar 2010 17:37:50 -0500, "krw@att.bizzzzzzzzzzzz" = wrote: > On Mon, 22 Mar 2010 06:48:17 -0700, Joerg = wrote: > > > krw@att.bizzzzzzzzzzzz wrote: > > > On Sun, 21 Mar 2010 16:48:02 -0700, Joerg = wrote: > > > =20 > > > =20 > > > Um, after you "vaporize the water content", what are you proposing to= r


Re: IR Receiver/Demodulator

Started by krw...@att.bizzzzzzzzzzzz in sci.electronics.design7 years ago

On Mon, 22 Mar 2010 21:59:58 -0700, "JosephKK" wrote: > On Mon, 22 Mar 2010 17:37:50 -0500, "krw@att.bizzzzzzzzzzzz" wrote: > > > On...

On Mon, 22 Mar 2010 21:59:58 -0700, "JosephKK" wrote: > On Mon, 22 Mar 2010 17:37:50 -0500, "krw@att.bizzzzzzzzzzzz" wrote: > > > On Mon, 22 Mar 2010 06:48:17 -0700, Joerg wrote: > > > > > krw@att.bizzzzzzzzzzzz wrote: > > > > On Sun, 21 Mar 2010 16:48:02 -0700, Joerg wrote: > > > > > > > > >