Joe Smith
Guest
Sun Jan 31, 2010 9:44 am
My 2 to 10 gigahertz sig gen has an output of 2.2V,RMS,,,,how can I
bring this up to 5 volts NOT rms.
Thanks
Joe in Texas
krw
Guest
Sun Jan 31, 2010 4:22 pm
On Sat, 30 Jan 2010 23:44:38 -0800 (PST), Joe Smith
<johnbrooks.smith_at_gmail.com> wrote:
Quote:
My 2 to 10 gigahertz sig gen has an output of 2.2V,RMS,,,,how can I
bring this up to 5 volts NOT rms.
1. Assume a sine wave.
2. Multiply by 2.8
3. You now have 6.2Vp-p (P-P is NOT RMS).
4. If necessary, add a pad to get to 5V
John Fields
Guest
Sun Jan 31, 2010 4:38 pm
On Sat, 30 Jan 2010 23:44:38 -0800 (PST), Joe Smith
<johnbrooks.smith_at_gmail.com> wrote:
Quote:
My 2 to 10 gigahertz sig gen has an output of 2.2V,RMS,,,,how can I
bring this up to 5 volts NOT rms.
Thanks
Joe in Texas
---
The short answer is: get a 2dB pad.
The "why?" is:
VPP = VRMS * 2 sqrt(2) = 2.2V * 2 * 1.414 = 6.22 volts
E2 5.0V
dB = 20 log 10 ---- = ------ = 20 log 10 (0.804)
E1 6.22V
dB = -1.896
Attenuate the 2.2V signal by 1.896 dB:
JF
