I'm just dipping my toes into an HF design and could do with some gain, the ADL5530 got my eye,
A quick calc (please check, I'm slightly out of my comfort zone):
- The ADL5530 is specified to have a 1dB compression point of 21.7dBm = 148mW.
- P = V*V/R so in a 50R system this yields V = 2.72V rms.
Hmm, now here's how I know I've gone wrong,
- 2.72V rms for a sinusoid equates to 3.85v pk and so 7.7v pk-pk, how with just a 5v supply?
- Working backwards, if it could swing to the rails, thats only 5Vp-p, 2.5Vpk, 1.77Vrms, 62.5mW so 17.9dBm
Any pointers in the right direction would be most welcome.
I'm designing a test pulse generator for 15ns wide, fast rise/fall pulses with variable amplitude from mV to +/-2.8v pk
The 2.8v pk pulse would I thought need a gain stage capable of 2Vrms hence 80mW rms hence 19dBm rms output.
I've +/-300mV to +/-500mV pulses from an ADCMP606 as a starting signal, a digital step attenuator for level control.
Allowing for DSA insertion, RF switch, connectors, some coax and PCB losses I need about 22dB of gain.
I was thinking of an ADL5530 before and another after the DSA.
I rulled out a conventional opamp as I'd be looking for 1500v/us and large signal GBP > 2.3GHz