CHW1010/20 AoA/AoD Differential RF Switch

CoreHW's CHW1010 is a single chip phase-matched SP16T antenna switch array, and the CHW1020 is a single chip phase-matched SP8T differential antenna switch array. Both are suitable for Bluetooth AoA and AoD direction-finding devices. Low phase-mismatch between switch paths minimizes residual error in computed angles of beam direction and subsequently improves estimated location accuracy.

A single CHW1010 switch can support an antenna array up to 16 single-ended 50 Ω antennae, and a single CHW1020 switch can support an antenna array up to 8 differential 100 Ω antennae. Larger antenna count arrays can be supported by combining multiple devices. The unused and inactive antenna ports are internally terminated to 50 Ω or 100 Ω. Open or short termination variants are available on request.

To enable high-performance AoD operation, CHW1010 includes a soft antenna switching function (AoDTX-mode) that reduces unwanted spectral emissions and helps compliance with Bluetooth 5.1 standard and FCC/ETSI regulatory requirements. The CHW1010 and CHW1020 can be controlled using a simple 6-pin GPIO interface. Reduced GPIO count configurations are possible. CHW1010’s and CHW1020’s low power consumption and fast start-up time with only a few external components make them ideal for small, low-cost battery-powered devices.