While looking at a single sideband receiver project that may be coming up I checked the usual suspects for quadrature demodulators. Many won't (technically ...) go much below 100MHz. Some do and I need to be more in the 5-10MHz region. But they are massive guzzlers when it comes to draining the battery. Like this one which slurps a whole watt (!): http://cds.linear.com/docs/Datasheet/5584f.pdf Isn't there anything better out there that hasn't been discontinued? Or do I have to roll my own again? -- Regards, Joerg http://www.analogconsultants.com/
Any low power low frequency quadrature receivers?
Started by ●May 3, 2012
Reply by ●May 3, 20122012-05-03
On 4 Maj, 02:53, Joerg <inva...@invalid.invalid> wrote:> While looking at a single sideband receiver project that may be coming > up I checked the usual suspects for quadrature demodulators. Many won't > (technically ...) go much below 100MHz. Some do and I need to be more in > the 5-10MHz region. But they are massive guzzlers when it comes to > draining the battery. Like this one which slurps a whole watt (!): > > http://cds.linear.com/docs/Datasheet/5584f.pdf > > Isn't there anything better out there that hasn't been discontinued? Or > do I have to roll my own again? >something like this?: http://www.analog.com/en/rfif-components/modulatorsdemodulators/ad8333/products/product.html -Lasse
Reply by ●May 3, 20122012-05-03
Hell... these days, it's more like... ADC, Hilbert transform, lowpass filter. And it'd probably come out way less than a watt. That's kind of sad. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "Joerg" <invalid@invalid.invalid> wrote in message news:a0gnkdFm0qU1@mid.individual.net...> While looking at a single sideband receiver project that may be coming > up I checked the usual suspects for quadrature demodulators. Many won't > (technically ...) go much below 100MHz. Some do and I need to be more in > the 5-10MHz region. But they are massive guzzlers when it comes to > draining the battery. Like this one which slurps a whole watt (!): > > http://cds.linear.com/docs/Datasheet/5584f.pdf > > Isn't there anything better out there that hasn't been discontinued? Or > do I have to roll my own again? > > -- > Regards, Joerg > > http://www.analogconsultants.com/
Reply by ●May 4, 20122012-05-04
On Thu, 03 May 2012 18:25:40 -0700, langwadt@fonz.dk wrote:> On 4 Maj, 02:53, Joerg <inva...@invalid.invalid> wrote: >> While looking at a single sideband receiver project that may be coming >> up I checked the usual suspects for quadrature demodulators. Many won't >> (technically ...) go much below 100MHz. Some do and I need to be more >> in the 5-10MHz region. But they are massive guzzlers when it comes to >> draining the battery. Like this one which slurps a whole watt (!): >> >> http://cds.linear.com/docs/Datasheet/5584f.pdf >> >> Isn't there anything better out there that hasn't been discontinued? Or >> do I have to roll my own again? >> > something like this?: > http://www.analog.com/en/rfif-components/modulatorsdemodulators/ad8333/products/product.html> > -Lasse190mW still isn't super low -- but it's an impressive part. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com
Reply by ●May 4, 20122012-05-04
On 5/3/2012 7:38 PM, Tim Williams wrote:> Hell... these days, it's more like... ADC, Hilbert transform, lowpass > filter. And it'd probably come out way less than a watt. That's kind of > sad. > > Tim >If you have access to the clock, actually 4x the clock, the demod can be quite simple. Split the sample stream in half, then with those two streams, alternately multiply by -1. Then you have I and Q channels.
Reply by ●May 4, 20122012-05-04
On Thu, 03 May 2012 21:38:25 -0500, Tim Williams wrote:> Hell... these days, it's more like... ADC, Hilbert transform, lowpass > filter. And it'd probably come out way less than a watt. That's kind > of sad.Perhaps, but the following FPGA and/or high-performance DSP will probably suck down plenty-o-power (and space). It'd be interesting to check, though. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
Reply by ●May 4, 20122012-05-04
On May 3, 10:56=A0pm, miso <m...@sushi.com> wrote:> On 5/3/2012 7:38 PM, Tim Williams wrote: > > > Hell... these days, it's more like... ADC, Hilbert transform, lowpass > > filter. And it'd probably come out way less than a watt. That's kind of > > sad. > > > Tim > > If you have access to the clock, actually 4x the clock, the demod can be > quite simple. Split the sample stream in half, then with those two > streams, alternately multiply by -1. Then you have I and Q channels.or, Q and I? ...nevermind.
Reply by ●May 4, 20122012-05-04
langwadt@fonz.dk wrote:> On 4 Maj, 02:53, Joerg <inva...@invalid.invalid> wrote: >> While looking at a single sideband receiver project that may be coming >> up I checked the usual suspects for quadrature demodulators. Many won't >> (technically ...) go much below 100MHz. Some do and I need to be more in >> the 5-10MHz region. But they are massive guzzlers when it comes to >> draining the battery. Like this one which slurps a whole watt (!): >> >> http://cds.linear.com/docs/Datasheet/5584f.pdf >> >> Isn't there anything better out there that hasn't been discontinued? Or >> do I have to roll my own again? >> > something like this?: http://www.analog.com/en/rfif-components/modulatorsdemodulators/ad8333/products/product.html >Yes, something like but just not at so much power consumption. This one is especially archaic. Needs a negative supply which nowadays hardly any device has (ok, I can make that) and then almost 200mW. They state it "per channel", probably so it looks better :-) -- Regards, Joerg http://www.analogconsultants.com/
Reply by ●May 4, 20122012-05-04
Tim Williams wrote:> Hell... these days, it's more like... ADC, Hilbert transform, lowpass > filter. And it'd probably come out way less than a watt. That's kind > of sad. >That's going to consume lots of real estate and power. I have a spectrum analyzer that works in a similar way but still needs 2W (which, of course, is much less then the 200-300W of a big boat anchor). The PC digs all the signals back out but after a few minutes the fans come on and stay on ... -- Regards, Joerg http://www.analogconsultants.com/
Reply by ●May 4, 20122012-05-04
miso wrote:> On 5/3/2012 7:38 PM, Tim Williams wrote: >> Hell... these days, it's more like... ADC, Hilbert transform, lowpass >> filter. And it'd probably come out way less than a watt. That's kind of >> sad. >> >> Tim >> > > If you have access to the clock, actually 4x the clock, the demod can be > quite simple. Split the sample stream in half, then with those two > streams, alternately multiply by -1. Then you have I and Q channels. >I know, I've done it many times that way using discrete parts. Since the late 80's, pretty much. But that consumes lots of real estate and power. This time I don't have either. -- Regards, Joerg http://www.analogconsultants.com/
