A 150 µW −57.5 dBm-Sensitivity Bluetooth Low-Energy Back-Channel Receiver with LO Frequency Hopping

A low power backchannel BLE wake-up receiver is presented. The receiver monitors the BLE advertising channels for a pre-programmed pattern. As in the BLE standard, frequency shift modulation (FSK) is chosen to be the modulation scheme of the signal that will be received. This makes the wake-up algorithm compatible with the standard, and hence, it can be generated by a commercial off-the-shelf device. The proposed receiver uses a dual-mixer to down-convert the RF input to reduce the LO power consumption by operating it at half the RF frequency. The receiver has a -57.5 dBm sensitivity while consuming 150 μW.