pSemi PE128300 Dual-Channel Up-Down Converter
pSemi PE128300 Dual-Channel Up-Down Converter is designed for 5G FR2 n258 and n257 frequency bands in the 24.25GHz to 29.50GHz range. In transmit mode, the input to a channel is applied to IF_I and IF_Q 50Ω impedance ports. The signal passes through circuits that 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 50Ω 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.
The PE128300 chip supports both fundamental and sub-harmonic inputs of the internal local oscillator to drive signals to the mixers. This PE128300 features two dedicated inputs. The LO_IN port includes a 4x multiplier chain in its path to create the internal mixer drive signal frequency in support of low-side conversion. The LOX4_IO permits direct drive of the internal mixers at the required switching frequency.
Up to 16 different mode definitions are pre-stored and selectable via a single-byte SPI command. Mode definitions contain seven elements: LO power on/off, V/H RX power on/off, V/H TX power on/off, and V/H T/R switch state. Typical modes are TX, RX, idle, sleep, and loopback.
Features
- Supports bands n258 and n257, 24.25GHz to 29.50GHz
- Compatible with PE188100 and PE188200 8-channel beamforming front ends
- Separate V- and H-channel use a single X4 LO multiplier
- Fast TDD switching of <800ns
- Image reject up and down converters with I/Q balance adjustment
- IF, LO I/Q phase, and IF amplitude adjustment
- Up to 16 pre-stored modes selected by a single byte SPI command
Applications
- 5G base stations
- 5G customer premises equipment (CPE)
- Point-to-point radio
Functional Block Diagram
Additional Resources
Related Front End Modules
pSemi PE188200 8-Channel Beamforming Front-End Module
Designed for 5G applications in the 26.5GHz to 29.5GHz bands, supports 4 dual-polarity antennas.