Toshiba has been able to reduce current consumption, system on a chip that supports Bluetooth LE 4.2 50%
Toshiba announced the development of Bluetooth 4.2 LE system on a chip, power consumption of which is reduced by 50% compared to similar existing products for IoT devices. In transmission mode current is 3.5 mA in receiving mode and 3.2 mA. This allows to considerably increase the operation time without replacement of the power supply. SoC integration in RF circuits has allowed to reduce the number of external components and the size of the IoT devices.
According to the manufacturer, reducing energy consumption was the result of action in three directions.
First, the architecture of the receiver is optimized according to the criterion of energy consumption. The frequency synthesizer operates at half-rate. The resulting reduction in noise immunity kompensiruet choice of operating frequencies.
Second, the power blocks of the SoC controls the high efficiency power controller. Buck converters have been removed from the SoC, and to deal with noise is used accurate recording of frequency conversion, using PLL on value, not causing interference in the band of the Bluetooth LE.
Thirdly, the SoC uses radio frequency circuit with reduced power consumption. In particular, the receiver and transmitter have separate varistors with a smaller range of frequency change than necessary in the scheme with a common varistor.