Low Power Oscillator

Abstract

The invention relates to a low-consumption oscillator. The low-consumption oscillator comprises a clock generating unit and a frequency feedback control unit; the clock generating unit comprises an adjustable oscillator that generates a clock signal, and a clock generator that generates a first control signal, a second control signal and a third control signal according to the clock signal; the frequency feedback control unit comprises an integrator, a comparator and a digital processor; the integrator is triggered through a received first control signal to integrate band-gap reference current and convert the output frequency of the adjustable oscillator into output voltage to be output to one input end of the comparator, the band-gap reference voltage is connected to the other input end of the comparator, and an output comparing signal is triggered and locked through the third control signal; the digital processor generates frequency modulation bite according to the comparing signals, and accordingly the oscillator can change the capacitance or resistance according to the frequency modulation bite, and as a result, the oscillating frequency of the low-consumption oscillator can be changed.

Description

technical field [0001] The invention relates to the communication field, in particular to a low power consumption oscillator. Background technique [0002] A low power oscillator (LPO) is widely used in wireless communication systems. Since the data interaction between wireless sensor nodes is rare and can be completed in a short period of time, the purpose of reducing power consumption can be achieved by periodically waking up the sensor nodes and letting the nodes enter a sleep state at other times. . LPO usually provides a system clock to control critical timing in sleep or other power-saving modes, such as keeping the system synchronized or used to wake up the system. Therefore, LPO needs to have a more accurate oscillation frequency. [0003] Although active off-chip crystal oscillators, such as temperature-compensated quartz crystal oscillators, can achieve high precision, in order to save cost and power consumption, LPO circuits rarely use off-chip crystal oscillat...

AI Technical Summary

Problems solved by technology

However, the oscillation frequency of LPO realized by RC constant or bias control will fluctuate with changes in process, power supply voltage, temperature (Process, Voltage and Temperature, PVT), bias and other circuit parameters, resulting in the time or frequency of LPO is less accurate

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