Concurrent, reconfigurable, low power harmonic wake-up and main radio receiver

摘要

A wireless receiver includes a receiver front-end where the input of the LNA and the mixer have separate main radio and wake-up modes, where same DC voltage is used at the input of the LNA, and the input of the baseband filter. When the receiver switches between the wake-up and main radio mode, wake-up current usage is reduced due to near zero latency in programming bias voltages from the power management unit. The receiving circuitry can one or both of selectively change a signal processing path for the receiving circuitry or selectively configure signal processing circuits of the receiving circuitry when switching between the wake-up mode configuration and the main radio mode configuration. The programming and configurations are dependent on the dynamic range and modulation techniques and requires near zero area overhead compared with the main radio receiver.

主权项

1. An apparatus for a radio receiver, the apparatus comprising:
an input configured to receive signals from an antenna; receiving circuitry connected to the input, wherein the receiving circuitry has at least a wake-up mode configuration and a main radio mode configuration; and a controller connected to the receiving circuitry and configured to switch the receiving circuitry between from the wake-up mode configuration to the main radio mode configuration based on signals received from the antenna; wherein the receiving circuitry is configured to use a same DC bias point in both the wake-up mode configuration and the main radio mode configuration and to one or both of: selectively change a signal processing path for the receiving circuitry, and selectively configure signal processing circuits of the receiving circuitry,when switching between the wake-up mode configuration and the main radio mode configuration;wherein in the main radio mode configuration, the signal processing path comprises:
a front end circuit connected to the input to receive the signals from the antenna and output a front end output, a main downconversion mixer circuit to convert the front end output from an RF carrier to baseband frequency to output a downconverted signal; a main baseband amplifier circuit connected to receive the downconverted signal and output a main baseband output;wherein in the wake-up mode configuration, the signal processing path comprises:
a second downconversion mixer circuit to convert information from an RF carrier frequency to a wake-up baseband frequency, the second downconversion mixer circuit different from the main downconversion mixer circuit; and the main baseband amplifier circuit connected to receive the signals from the antenna without passing through the front end circuit.