This may come under the heading of 'power amp', but... 50 ohm system, input/output VSWR < 1.1 VSWR fixed with low TC GAIN gain of 5, up to maybe 10? fixed with low TC OUTPUT RANGE 0 dBm < output < +14 dBm, prefer up to +20 dBm FREQUENCY [input/output AC coupled] 0.5MHz to 100MHz prefer 0.1 MHz, but can live with 500 kHz [is this difficult to meet?] noise floor measured at output noise density function < 10nVrms/rtHz [the difficult part!] single tone measurement: 2nd Harmonic distortion < 90dBfc 3rd distortion < 80dBfc 4th etc < 95dBfc Manufacturer? Part Number? If not meet, anything close?

Ha, sounds like you need to rip the vertical amp board out of an old Tektronix acope.

Who makes the best highly linear RF amplfier that meets this spec?

May 05, 2014 45 Replies

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Kevin Aylward 12 years ago

Data sheets are designed as lies. The always quote specs in such a way as to give a misleading impression as to what the device can do.

Its always this accuracy, that bandwidth at there power, but none of it is simultaneous.

In this case, the small signal bandwidths plots out to 100 Mhz are pretty much useless.

As a matter of course, all data sheets need to be inspected very closely to beat the marketing obfuscations. In fact INL and DNL were invented for that purpose. If a "16 bit" converter was actually truly 16 bit, only one spec on its accuracy would be required.

Kevin Aylward B.Sc.

formatting link

- SuperSpice.

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upsidedown 12 years ago

This is of course true for the first page of any data sheet these days.

For the rest of the pages, you have to be the Devil's advocate to find out if the parameters used relevant to you.

In audio business, companies promote ADC/DACs at 48/96/192 kHz sampling rate, but always measure SNR at 3 Hz to 20 kHz :-).

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Tim Williams 12 years ago

And as a real-world example, consider gigabit Ethernet: the baud rate is in the 100s meg range, not much beyond 100 meg Ethernet (that is, within an octave or two, but not a decade). The number of levels, on multiple duplexed pairs, is what pushes it out there. Besides active compensation and I don't know what else. Sure, you can do raw binary LVDS (or similar) well into the gigs, but it's not very useful beyond short onboard communications.

Tim

Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com

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krw 12 years ago

Well, in the audio business, that's what's really of interest. Anyone doing 192kHz digital audio is playing the same game. ;-)

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krw 12 years ago

FPDLink-III does 3Gb over 10m of cable.

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josephkk 12 years ago

ADC

Making

transistors.

No argument. 16 bits at 10 MHz (Msamp/s) is hard, going faster gets really hard.

order

Having glances at the arithmetic, i will take your word on that.

issue

than

I may have to think this through a few times, but looks right.

?-)

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