A charge transfer rc relaxation oscillator

Abstract

The invention relates to a charge transfer RC relaxation oscillator applied to low power consumption equipment. Compared with a relaxation oscillator circuit structure in the background technology, the charge transfer RC relaxation oscillator uses a pseudo inverter chain to replace a comparator so as to avoid the influence of imbalance and time-delay of the comparator on the clock frequency, following changes of technology, voltage and temperature. At the same time, the frequency of the oscillator is irrelevant to the charge and discharge current and the threshold of the pseudo inverter chain. In the charge transfer RC relaxation oscillator, traditional capacitor cathode grounding is changed as connection with two reference voltages alternately, the charge transfer RC relaxation oscillator utilizes the charge transfer mode to generate a triangular wave signal with a step voltage on the anode of the capacitor so as to be able to use a pseudo inverter to determine the magnitude of the level of the signal. The charge transfer RC relaxation oscillator provides a pseudo inverter chain structure which has no short circuit current, wherein the time delay does not change following power voltage, and the time delay of the inverter chain can be realized through adjustment of resistance value.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, in particular to an RC relaxation oscillator circuit. Background technique [0002] Oscillators are widely used in low-power on-chip integrated systems such as energy harvesting systems, microcontrollers, and high-speed interface circuits. In these applications, area and power consumption are two key considerations. For example, in low-power energy harvesting systems, the energy harvested by the system is very limited, and there are strict constraints on the power consumption of the clock circuit. The RC relaxation oscillator has the characteristics of low power consumption and easy on-chip integration, and is very suitable for application in these low-power electronic devices. [0003] refer to Figure 5 . The document "S.L.J.Gierkink and E.van Tuij, A coupled sawtoothoscillator combining low jitter with high control linearity[J], IEEE Journal of Solid-State Circuits, vol.37, no.6...

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Problems solved by technology

The RC relaxation oscillator has the following disadvantages: the offset and delay time of the comparator change with changes in temperature, voltage, and process, resulting in unstable frequency of the oscillator

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