Arb WaveForm gen with +-15v output? - Page 1
Forum section: electronics / testgear

author: max_torque
author_rank: Super Contributor
timestamp: November 13, 2017, 09:55:25 am
content: Does anyone know if anyone does an Arbitrary Waveform generator with a +-15v output? Need to drive ~1k load, at up to 10Mhz (sine)I could easily make a little amplifier to add to a std unit that does +-10v output, but if i could get a unit that did it all in one that would be handy!

author: tszaboo
author_rank: Super Contributor
timestamp: November 13, 2017, 10:16:06 am
content: Well these are usually built with 50Ohm outputs. 30VPP into 50 Ohm is: 10.6V RMS, 2.25W. The thing is, getting 10VPP (typical for AWGs) is easy, and you can do it with a single opamp. Getting 30VPP is slightly more difficult, and usually it doesnt get designed in.Also, if you make a few MHz signal, connect it to an antenna, it could violate laws in many places.That being sad, I faintly remember, that the BK 4000 series has higher voltage output.

author: Hydron
author_rank: Super Contributor
timestamp: November 13, 2017, 10:23:43 am
content: Does the output need to be wideband capable? If low frequency output is unnecessary you may be able to simply use a small pulse transformer for step-up of a lower voltage output.

author: tautech
author_rank: Super Contributor
timestamp: November 13, 2017, 10:25:01 am
content: The power amp accessory for the Siglent AWG's comes close to your needs at 25.4 Vp-p.However it's intended to deliver higher currents, not voltages.http://www.siglentamerica.com/prodcut-fjxx.aspx?fjid=1289&id=1364&tid=16&T=2

author: simone.pignatti
author_rank: Frequent Contributor
timestamp: November 13, 2017, 10:29:36 am
content: The upcoming Siglent SDG6000X has 20Vpp up to 40MHz on HiZ loadI checked some external amplifier but they often offer a limited bandwidth

author: Hydron
author_rank: Super Contributor
timestamp: November 13, 2017, 11:01:43 am
content: Also along the same lines as the Siglent amp (it's designed for heavy loading, but does offer increased voltage output too - up to 36Vpp):https://cleverscope.com/products/CS1070(note that it can be used as a stand-alone unit, does not need to work with a specific scope/sig-gen)There may be other similar options, I just happen to know the guy who produces/sells these, so I knew of the existence of this particular product.It's also possible to DIY a power amp, but would be a bit of work.

author: jpb
author_rank: Super Contributor
timestamp: November 13, 2017, 11:45:14 am
content: You don't mention anything about budget!1kohm in series with 50 ohm presumably means that the HiZ output needs to be 21/20 * 30Vpp = 31.5VppTabor do some (expensive) units that do 16Vpp into 50 ohms and 32Vpp into hiZ but even at refurbished 65% discount the cost is $2000 (The WS8102)http://www.taborelec.com/ex-demoThis would be overkill for simply producing a sin wave though. (Tabor Electronics produce good units though - did have, or still have, an OEM deal with Keysight I think.)

author: HighVoltage
author_rank: Super Contributor
timestamp: November 13, 2017, 11:50:23 am
content: Keysight has the 33502A amplifierhttp://www.keysight.com/en/pd-1735261-pn-33502A/isolated-amplifier-2-channel-50-vpp?cc=US&lc=eng

author: capt bullshot
author_rank: Super Contributor
timestamp: November 13, 2017, 11:54:02 am
content: Quote from: max_torque on November 13, 2017, 09:55:25 amTha't pretty uncommon with these things. Usually they have +/-10V into high impedance, don't know an off the shelf model with higher amplitude. Some older analog function generators can do +/-15V or even +/-20V.

author: bd139
author_rank: Super Contributor
timestamp: November 13, 2017, 01:03:58 pm
content: Some of the older analogue ones will do that. HP3312A will for example.I'd build an amp myself. 1K isn't hard to drive at 10MHZ.

author: jpb
author_rank: Super Contributor
timestamp: November 13, 2017, 02:04:28 pm
content: Quote from: HighVoltage on November 13, 2017, 11:50:23 amThat looks to be low frequency though - 100kHz bandwidth at the full 50Vpp, it doesn't say what amplitude at 10MHz but presumably a lot less.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: November 13, 2017, 07:49:17 pm
content: I sent an e-mail over to my function generator guy, I'll let you know what I find out!

author: nfmax
author_rank: Super Contributor
timestamp: November 13, 2017, 10:41:30 pm
content: Quote from: bd139 on November 13, 2017, 01:03:58 pm3312A is 20V pk-pk maximum into an open circuit. You may be thinking of the 3325A, which had a high voltage output option.

author: bd139
author_rank: Super Contributor
timestamp: November 13, 2017, 10:42:16 pm
content: Actually my bad I read 15v p-p in the title.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: November 14, 2017, 01:07:56 am
content: You are only telling us one parameter pair when you mention driving 10MHz into 1kOhm. On the other side, you specifically ask for an ARBITRARY generator, whose purpose is generally to drive anything but sine! So I suspect that you have some other requirements as well. A output amplifier or booster for a arbitrary waveform generator should be specified for DC as well as for step functions, otherwise it's a output modifier (filter)!Even if it was a erroneous designation and you do not need and ArbGen, it would be helpful to know more.As mentioned above, there is the HP 3325A with option 002, which gives you 40Vpp, but triangle is limited to 11kHz (Sin to 21MHz, Square to 10MHz).Also the nice little HP3314, which goes to 19.99MHz with option 001 would give you 30Vpp. (not sure about limitations, but this one does ARB)I looked at my Analogic's and they do only 10Vpp into 50Ohms, same for the Prema ARB1000 and the SRS DS345. And those are fairly high-end. So you would need to go either for one of the devices with special options or use a booster. If you really need only the 10MHz SINE with 30Vpp into 1k, then somithing might be cobbled together using a modern power OPA and/or buffer IC.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: November 14, 2017, 01:59:24 am
content: Addendum:the HV output on the HP3314 AND the HP3325 is specified only to 1MHz Sin/Sq, I don't know if it is active at all above that. I also darkly remember a Arb generator from Wavetek with a 100Vpp output (option?), but no designation.