Method for low-current oscillatory circuit with wide operation voltage and temperature compensation

A method for a low-current oscillatory circuit with wide operation voltage and temperature compensation,

• wherein said oscillatory circuitry uses the method and said oscillatory circuitry comprises an oscillator, a memory, a temperature sensor, and a microcontroller unit (MCU);
• said MCU connects to said oscillator, said memory, and said temperature sensor;
• said oscillator further comprises a proportional-to-absolute-temperature (PTAT) circuit and connects to a low-voltage regulator;
• said low-voltage regulator connects to a PMOS diode array;
• said PMOS diode array comprises a plurality of parallel connected PMOS diodes;
• said PMOS diode array connects to said MCU;
• a delay unit circuit is connected after said low-voltage regulator;
• and said delay unit circuit connects to said MCU and a voltage converter, separately;
• and
• wherein the method comprises a smart learning algorithm of ultra-high temperature compensation, comprising steps of:
• (a1) starting said temperature sensor to sense a temperature;
• (b1) when said temperature is higher than a threshold, using said MCU to check whether said timebase clock is conformed to calibration specifications;
• if yes, ending calibration;
• and, if not, processing the next step (c1),
• wherein said threshold is a temperature of 85·180° C.;
• (c1) finding relationship between said timebase clock and an assigned clock by said MCU to adjust parameters,
• wherein a present bit of said PMOS diode array is set to be 1;
• when said timebase clock is smaller than said assigned clock, said present bit is confirmed to be set as 1;
• and, when said timebase clock is greater than said assigned clock, said present bit is confirmed to be set as 0;
• and
• wherein said MCU checks and adjusts said PMOS diode array to obtain varied leakage currents to compensate clock variations,
• wherein said PTAT circuit is used to generate currents having positive correlation to temperature to be injected into an internal circuit of said low-voltage regulator;
• said low-voltage regulator changes by following process variations and generates varied low stable voltages to said delay unit circuit;
• and, at last, said delay unit circuit generates assigned clock outputs;
• and
• (d1) checking whether said PMOS diode array is adjusted till a last bit;
• if not, processing step (b1);
• and, if yes, storing data of said PMOS diodes into said memory under an editing mode and building a look-up table to end calibration,
• wherein said look-up table is applied to process next compensation.