The PE128300 is dual-channel TDD up-down converter designed for 5G FR2 n257, n258 and n261 frequency bands.
In transmit mode, the input to a channel is applied to IF_I and IF_Q 50 Ohm impedance ports. The signal passes through circuits which adjust the relative amplitude and phase of the I/Q signals. T/R switches route the IF signal to the transmit image reject mixer. Next, the up-converted signal is either directly connected to an RF amplifier, or, in the packaged case, is routed through a bandpass filter inside the package and amplified afterward. The RF amplifier outputs route through T/R switches to IC bump contacts.
In receive mode, the input arrives at the RF 50 Ohm port and is then routed to the RX image reject mixer by a T/R switch. After the down-conversion, the signal passes through the I/Q quadrature correction circuits. The I/Q correction digital control is multiplexed between TX and RX stored coefficients depending upon the active mode.
