NB-IoT wake-up receiver
AssigneeThe Regents of the University of Michigan
InventorsTrevor Odelberg, David Wentzloff
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Abstract
A low-power standard-compliant NB-IoT wake-up receiver (WRX) is presented. The WRX is designed as a companion radio to a full NB-IoT receiver, only operating during discontinuous RX modes (DRX and eDRX), which allows the full high-power radio to turn off while the wake-up receiver efficiently receives NB-IoTWake-Up Signals (WUS). The fabricated receiver achieves 2.1 mW power at −109 dBm sensitivity with 180 kHz bandwidth over the 750-960 MHz bands. The WRX is fabricated in 28 nm CMOS and consumes 5× less power than the best previously published traditional NB-IoT receivers. This disclosure is the first designed dedicated wake-up receiver for the NB-IoT protocol and demonstrates the benefits of utilizing a WRX to reduce power consumption of NB-IoT radios.
Claims14
A narrowband wake-up receiver, comprising;
- an antenna configured to receive an RF signal;
- a low noise amplifier interfaced with the antenna;
- a local oscillator;
- a mixer circuit configured to receive the RF signal from the low noise amplifier and a mixing signal from the local oscillator, where the mixer circuit downconverts frequency of the RF signal to an intermediate frequency;
- and
- a fractional n phased-locked loop circuit interfaced with the local oscillator, wherein the wake-up receiver is powered down during period intervals.
A narrowband receiver system, comprising;
- a wake-up receiver;
- and
- a main receiver configured to operate in a high power state and a low power state, where the main receiver operates in a high power state in response to a wake-up signal received from the wake-up receiver and the main receiver consumes more power in the high power state than in the low power state, wherein the wake-up receiver includes:
- an antenna configured to receive an RF signal;
- a low noise transconductance amplifier interfaced with the antenna;
- a local oscillator;
- a mixer circuit configured to receive the RF signal from the low noise transconductance amplifier and a mixing signal from the local oscillator, where the mixer circuit downconverts frequency of the RF signal to an intermediate frequency;
- a frequency locked loop circuit interfaced with the local oscillator;
- and
- a fractional n phased-locked loop circuit interfaced with the local oscillator.
Dependencies are inferred from the claim text.