Low power CMOS system with wireless capability are attracting more and more attentions because of their vast applications in wireless sensor network, implantable devices and the future internet of thing (IoT). To reduce the power consumption, the low power systems are often put into sleep mode when no task is assigned. Most power consuming blocks of the system, e.g. RF transceiver, are turned off during the sleep mode to extend the battery life.
High performance low power wake-up receiver which avoids SNR degradation and adjust detection threshold adaptively
The inventor discloses a low power wake-up receiver, which consumes extremely low power to keep monitoring the channel. Upon detecting the wake-up signal, it wakes-up the main receiver for data reception. Two techniques are introduced to improve baseband processing performance for ultra low-power wake-up receiver. One is based on summation of consecutive pseudo-random codes used to correlate the received signal such that SNR degradation due to sampling time offset can be mitigated. Another technique is to estimate noise power in baseband such that detection threshold and gain of the baseband can be set adaptively.
- Internet of Things
- Lower power
- Smaller area
- Benefits from semiconductor technology advances
- More robust against interference
- More robust against sampling time uncertainty