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DC shifting AC 0-150MHz?

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Astrid

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Hello,
I have very precise sine source 0-150MHz with 14bit DDS (driving from 0,5GHz clock) and several AD8021,
amplitude is 3mV - 3V (source is low noise, low distorsion and precise).
I need add DC level shifter 0-3V.
Can recomended tried circuit ?
 

The easiest way is to use a capacitor from your signal generator to the output, and use a potentiometer connected from ground to +5 VDC source to set the DC offset at the output (after the capacitor).
Capacitor value should be selected to pass the lowest frequency to the output; capacitive reactance should be < 1/10 of the source/load impedance.

If you must start from 0 Hz, then use a fast operational amplifier instead of the capacitor, and feed the DC offset voltage to the other opamp input.
 

You tell, that the design already involves wide band amplifiers (AD8021). I can't imagine a DC shift problem in this case. It's just about designing an appropriate OP circuit, basically an adder.
 

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