Manufactured on ADI’s proprietary XFCB bipolar process, the AD8138 has a −3 dB bandwidth of 320 MHz and delivers a differential signal with the lowest harmonic distortion available in a differential amplifier. The AD8138 has a unique internal feedback feature that provides balanced output gain and phase matching, suppressing even order harmonics. The internal feed-back circuit also minimizes any gain error that would be associated with the mismatches in the external gain setting resistors.