A Review of On-Chip Adjustable RF Bandpass Filters: Adjustable On-Chip Filters

Nowadays, with the increasing performance requirements of wireless applications, the RF front end needs enough dynamic range to work properly in multiband. The traditional multichannel parallel structure provides outstanding performance, but repeated components consume a large board area and add complexity to the circuit [1] . To solve this problem, tunable architectures have been proposed [2] , [3] . At the same time, wireless telecommunication equipment is pushing toward low-cost system-on-chip technology, which integrates the RF front-end module with the back end onto a single chip.