Clock generator with ultralow power consumption

Abstract

The invention discloses a clock generator with ultralow power consumption. The clock generator comprises a broadband annular oscillator, a self-correction unit, a frequency detection unit and a frequency divider, wherein the broadband annular oscillator which consists of a phase inverter unit and a decoding and biasing circuit supplies a linearly changed clock signal with a wide range; the self-correction unit which consists of a rising edge detector, a rising edge counter, a reference frequency divider, a state machine, a reference counter, a comparator and a parameter configuration unit is used for correcting change of an output clock of the broadband annular oscillator, which is caused by a process, temperature and voltage; the frequency detection unit which consists of a frequency detection enabling door, a frequency doubler, a detection counter, a parameter configuration unit and a comparator is used for detecting the output clock; and when the frequency offset of the output clock is greater than a preset value, the self-correction unit is started. The clock generator can adjust the frequency of the output clock according to a requirement, has a simple structure, ultralow power consumption, a small area and high reliability, is easy to integrate, and can be widely applied to communication systems, and the shortcoming of the frequency offset of the clock generator is overcome.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to a low-frequency clock circuit, in particular to an ultra-low power consumption clock generator. Background technique [0002] In the communication system, the clock is a necessary and critical signal. In the front end of the RF transceiver, a local oscillator clock is required to down-convert the received RF input signal to an intermediate frequency or zero frequency, or to mix the data modulation signal to High-frequency carrier waves are emitted. In the analog baseband, a clock is needed to sample the intermediate frequency or zero frequency signal. In the baseband processor, a reference clock is needed to perform related processing on the data, so clock generation is an important and key module. [0003] There are several types of clock generation in the prior art: one is the local oscillator clock used for the radio frequency receiving front end, the clock signal has higher ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the prior art clock generator consumes a lot of power and cannot meet the requirements of low power consumption, and provides an ultra-low power , output a stable clock, while the power consumption of the circuit is less than 2uA, the circuit is fully integrated in the chip

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