TG Amp

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TG Amp

Post by Sam » Wed Mar 02, 2011 11:48 pm

First of all, my last post stated that the LO2 Isolation Amp is impressive. I'm not tooting my own horn here; it was Scotty's idea. Great idea.

Second, the LO2 amp is built on the IF2 amp board which has room for a second amp. That's where I put the amp for the tracking generator. If you're going to do the LO2 amp, there is really no reason not to do the TG amp as well.

Benefits of the TG amp:

1. Higher output level, if you choose. For VNA modes, the MSA can accurately take inputs somewhere in the -5 dBm to 0 dBm range. When you feed a bridge in Reflection mode, the max output of the bridge may be anywhere from 6 to 20 dB below the input signal, so even a 0 dBm TG output could be useful.

2. Excellent output return loss for at least a few hundred MHz. This greatly simplifies many measurements. OK, so you could accuse me of being a member of the return loss police. Guilty.

3. Suppression of reflections of very high frequency signals back into Mixer 2. Discussed in recent postings.

Sam W.

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