Dual wideband mixer targets 5G

February 02, 2017 // By Jean-Pierre Joosting
Linear Technology has introduced the LTC5566, a wideband, high dynamic range dual channel mixer with integrated programmable variable gain IF amplifiers.

This dual mixer has a very wide, 300 MHz to 6 GHz input frequency range, specifically optimized and with extensive characterization at the emerging 3.6 GHz and 4.5 GHz 5G bands, as well as the established 4G bands. Moreover, the device supports bandwidths up to 400 MHz to meet the needs of the growing sub-6-GHz 5G wireless access equipment. This dual mixer has outstanding dynamic range, with Input P1dB of +11.5 dBm and Input IP3 of +25.5 dBm at 3.6 GHz. At higher frequencies, up to 5.8 GHz, its IIP3 sustains more than +24 dBm.

The mixer’s integrated IF amplifier boosts the overall power conversion gain to a maximum of 12 dB. The gain of each channel is independently programmed in precise 0.5 dB steps via the on-chip SPI bus. So, with each channel driving an A/D converter, the fine gain control provides a simple means to balance the gain of the two channels and calibrate to the optimum level with minimal external components.

The LTC5566 is ideal for use in 5G wireless multichannel RRH (remote radio head) wireless access equipment that requires better performance and wider bandwidths at higher frequencies. Moreover, the device’s high level of integration enables high channel counts to be packed into a small enclosure. Other suitable applications include 4G LTE-Advanced, diversity receivers, distributed antenna systems and software-defined radio.