On-chip clock generating circuit with lower power consumption

Abstract

The invention discloses an on-chip clock generating circuit with lower power consumption. The on-chip clock generating circuit with the lower power consumption comprises a reference current source circuit, a frequency selection circuit, a controlled oscillating circuit and a wave-shaping circuit. The wave-shaping circuit is composed of a comparator, two cascade amplitude limiting circuits and an inverter chain and is used for carrying out amplitude limitation and shaping on the wave shape of output oscillating signals, lowers power consumption and outputs clock signals. The reference current source circuit generates reference current not varying along with the voltage of a power source and temperature, supplies multiple ways of image current sources to the frequency selection circuit, supplies controlled summarize current to a numerical control circuit, inputs the current to the controlled oscillating circuit, changes the frequency of a relaxation oscillator controlled by input current and realizes the functions configurable to the output clock signal frequency. The on-chip clock generating circuit with lower power consumption can be applied to a wake-up circuit and a sensor interface circuit in a wireless transmission radio frequency chip and an on-chip clock generating circuit in a data conversion circuit, and is particularly suitable for the occasions with wide variation range of temperature and voltage of the power source and with high low-power-consumption requirement.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and relates to a clock generating circuit, in particular to a low-power on-chip clock generating circuit, which can be applied to wake-up circuits requiring low-power operation in wireless radio frequency transceiver chips, and can also be applied to sensors , as the ADC sampling clock circuit for the sensor interface. Background technique [0002] In recent years, with the continuous improvement of the manufacturing level of integrated circuits, the chip size has been continuously reduced, and various portable devices have emerged, and these portable devices are basically powered by batteries. Power consumption imposes stringent requirements. Clock generating circuit is an important part of integrated circuit design, so designing a low-power clock generating circuit becomes particularly important in chips with low power consumption requirements. [0003] There are generally two kinds o...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the existing traditional technology, to provide a low-power on-chip clock generation circuit, which can improve the problem that the clock frequency varies greatly with the power supply voltage and temperature, and the power consumption of the circuit is also extremely low. Small, power consumption current is less than 1 uA

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