BUF802RGTEVM: Pass 150 MHz Digital Signal with DC Offset Adjustment down to negative region.

Hi Khoa,

The way you could use the BUF802 with DC offset adjustment would be with a circuit like the one shown in the front end of Figure 9-6. You would inject the DC offset where "Offset Control DAC" is shown in the figure. I was wondering if there was a reason you couldn't potentially use a faster amplifier in a non-inverting gain configuration and set the output offset by injecting the DC signal at Rg.

Best Regards,

Ignacio

In general, I would recommend to handle digital signals with comparators. That is, use something like the TLV3601 with a reference voltage of 0.5 V to detect whether the input signal is low or high, and then use a buffer like the SN74AUC1G17 with V_CC = 0 V, GND = −1 V to shift the output signal. (The SN74AUC1G17 has an overvoltage-tolerant input for up to 3.6 V, so the comparator's supply must not be higher than 2.6 V.)