In described examples, a relaxation oscillator (100) reduces temperature sensitivity and phase noise at low offset frequency by periodically swapping a first current (II) and a second current (12), so that after the first current (II) has been input to a first pair of circuits (120, 140) and the second current (12) has been input to a second pair of circuits (130, 140), the second current (12) is input to the first pair of circuits (120, 140), and the first current (II) is input to the second pair of circuits (130, 140).

Relaxation oscillator with current and voltage offset cancellation

A relaxation oscillator improving the linearity of control current-output frequency significantly comprises an oscillating circuit, a delay error detection circuit and a modulating current generation circuit. The delay error detection circuit is used for detecting the peak voltage of charge-discharge capacitors in the oscillating circuit, generates delay error erasure signals according to the peak voltage and enables the oscillator to oscillate at preset frequency. The modulating current generation circuit generates a corresponding additional control current according to the peak voltage of the charge-discharge capacitors, increases the charge rate of the charge-discharge capacitors, eliminates delay influence from the oscillating circuit and improves the linearity of control current-output frequency. Due to the fact that the additional control current output by the modulating current generation circuit enables voltage of the charge-discharge capacitors C1 and C2 to be increased, jittering of the signals output by the relaxation oscillator can be reduced.

Relaxation oscillator improving linearity of control current-output frequency significantly

The invention discloses a ring-shaped oscillation circuit, a ring-shaped oscillator and a realization method thereof, relating to the technical field of telecommunications. A technical problem that the required precision of a ring-shaped oscillation circuit device is high in the prior art is solved. The circuit comprises a current bias generating circuit and a ring-shaped oscillator level circuit. The ring-shaped oscillator level circuit comprises at least one level of first type of inverter and at least one level of second type of inverter. The current bias generating circuit is coupled with the first type of inverter. The output end of the first type of inverter is connected with the input end of the second type of inverter. The output end of the second type of inverter is connected with the input end of the first type of inverter.

Ring-shaped oscillation circuit, ring-shaped oscillator and realization method thereof

The invention discloses a high-precision relaxation oscillator capable of being trimmed and regulated The high-precision relaxation oscillator comprises an oscillation generator, a high-precision current bias generator, a voltage regulator and a driving and output part, wherein the high-precision current bias generator provides the bias for a constant current source in the oscillation generator, the voltage regulator generates two threshold levels for a comparator in the oscillation generator, and the oscillation generator utilizes capacitor charging and discharging to generate oscillation waveform to be provided for the driving and output part The high-precision relaxation oscillator has the positive effects that through the realization of the high-precision bias current and the trimming and regulation of a register of the comparison threshold levels, the process deviation and the oscillator frequency change during the power supply voltage or environment temperature change can be reduced, and the value after the frequency modification can meet the designed precision requirements

High-precision relaxation oscillator capable of being trimmed and regulated

The invention provides a high-precision and self-adapting relaxation oscillator. The high-precision and self-adapting relaxation oscillator offsets time delay produced by a charge-discharge control circuit arranged in an oscillating circuit according to a capacitor precharging principle, and comprises the oscillating circuit, a first capacitor precharging circuit and a second capacitor precharging circuit, wherein the capacitor precharging circuits are used for precharging a charge-discharge capacitor of the oscillator, the oscillating circuit performs charging and discharging on the basis of precharging level of the capacitor precharging circuits, error time delay produced by the capacitor during two times of charging is offset, so that the oscillator works at preset frequency, and frequency-control current linearity is remarkably improved. The time delay is not reduced by directly increasing speed of a comparator or an RS trigger, the time delay produced by the control circuit and influence of imbalance with external environment change are offset through two times of charging processes, the precision of the oscillator is obviously improved, and the oscillator has quite high temperature stability and power supply rejection, namely, adaptability.

High-precision and self-adapting relaxation oscillator

The invention relates to a relaxation oscillator with low power consumption, wherein the relaxation oscillator is invented for solving problems like high power consumption and the like in the prior art. The relaxation oscillator comprises a current source generation circuit, a charge and discharge circuit and a delay circuit. The current source generation circuit utilizes a cross voltage formed by connection of a gate and a drain of a first transistor so as to enable a resistor to generate a bias current; the charge and discharge circuits utilize a mirroring current of the bias current to enable a capacitance to be charged, so that a second transistor that has the same characteristics as the first transistor to be conducted; and with utilization of the delay circuit that is connected between a drain of the second transistor and a gate of a third transistor, the capacitance is able to be charged and discharged periodically, so that an oscillation frequency that is independent of a power source voltage is generated and a low power consumption effect is realized.

Junqi Wang

Papers

Relaxation oscillator with low power consumption