This IAMP has been designed for use as a low noise, programmable gain current amplifier for the G.Fast DSL protocol standard.
The IAMP has a gain range of -24dB to +1dB. At the 0dB setting the IAMP provides a nominal power of 4dBm into a 100Ω terminated line via a centre-tapped 1:1.25 transformer (centre tap at 3.3V) with a near-end termination resistance of 73.2Ω. In this case the output voltage swing at each of the differential output pins of the IAMP is between 1.9V and 4.7V
For good linearity the IAMP is biased with a DC standing current to ensure that the IAMP mirror transistors do not turn off at maximum signal excursions. The value of this standing current can be programmed to allow a trade-off of power and linearity.
The IAMP supports a “soft-start” mechanism to eliminate any transients when activating/de-activating it due to the large current drawn by the IAMP.
This block has a narrowband and wideband power mode.