Low power consumption tail current type ring oscillator circuit resistant to process, voltage and temperature changes

Abstract

The invention discloses a low power consumption tail current type ring oscillation circuit which is resistant to changes in technology, voltage and temperature. The oscillating circuit mainly includes a PTAT reference current generating circuit, a current mirror circuit, a tail current type ring oscillator, a strong pull-down and weak pull-up buffer stage and a buffer stage. The PTAT reference current generation circuit uses an external precision resistor to generate an accurate PTAT reference current with a positive temperature coefficient. The oscillation frequency of the tail current type ring oscillator has a linear relationship with the tail current, and the oscillation frequency has a negative temperature coefficient. The current mirror circuit mirrors the PTAT reference current with positive temperature coefficient to power the tail current type ring oscillator to compensate the negative temperature coefficient of the ring oscillator. This tail current type ring oscillator has the function of automatic anti-process dispersion. The PTAT reference current generation circuit and the current mirror circuit adopt the Cascode structure, and the oscillation frequency of the ring oscillation circuit is insensitive to the change of the power supply voltage. This circuit has simple structure and low power consumption.

Description

technical field [0001] The invention relates to the field of integrated ring oscillators, in particular to a low power consumption tail current type ring oscillator circuit resistant to process, voltage and temperature changes. Background technique [0002] Currently, low-power, small-size, and low-cost applications such as biomedical devices and sensors are driving research on on-chip low-power CMOS oscillators. In CMOS technology, there are many ways to generate clock signals, such as RC oscillator, LC oscillator, ring oscillator and so on. [0003] Ring oscillators are used in many integrated circuit chips because of their simple structure, convenient use, and strong adjustable range. However, its oscillation frequency is greatly affected by the drift of temperature and process parameters and the rejection ratio of power supply voltage, which has a great impact on the stability of the circuit. Therefore, the design of the ring oscillation frequency to the supply voltage...

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Problems solved by technology

However, this oscillator does not consider the discreteness brought by the process, so the practicability is poor

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