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Variable frequency multi-phase oscillator

A multi-phase oscillation and frequency technology, which is applied in the direction of instruments, DC power input conversion to DC power output, and adjustment of electrical variables, etc., can solve the problems of difficult frequency adjustment, circuit design that cannot be scaled, and large power dissipation.

Inactive Publication Date: 2009-10-21
O2 MICRO INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using a high frequency oscillator means high power dissipation and difficult frequency adjustment
At the same time, the use of a high-frequency oscillator also complicates the phase adjustment, making it impossible to achieve a single duty cycle design, and also makes the circuit design unable to scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 300

[0055] Embodiment 300 is only used to illustrate the functionality of the current-threshold correlator. A current-threshold correlator generates a threshold voltage. The adjustment of the threshold voltage is realized by adjusting the parameters of the analog signal, the PMOS transistor 310, the current mirror 320 and the resistor 330, and the reference voltage.

Embodiment 400

[0056] Embodiment 400 is only used to illustrate the delay unit. The PMOS transistor 410 in the delay unit 400 converts an analog signal or one of multiple control signals into a charging current, and the charging current is used to charge the capacitor 432 when the switch 434 is turned off. Capacitor 432 discharges when switch 434 is closed. The charging and discharging of capacitor 432 can generate a sawtooth wave and send it to comparator 420 . The comparator 420 compares the sawtooth waveform with the reference voltage and generates a digital signal to the RS flip-flop 440 . The RS flip-flop 440 is controlled by the above digital signal and the input signal of the input port 403 and generates a phase signal.

[0057] In the variable frequency multiphase oscillator 100 , the current-threshold correlator 110 can generate threshold voltages for synchronously controlling the delay units 120 , 122 , 124 , 126 and 128 . In this way, the duty cycles of the multi-phase signals ...

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PUM

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Abstract

The present invention provides a variable frequency multiphase oscillator for providing multiphase signals. The variable frequency multiphase oscillator includes a correlator, a plurality of delay units and a NOR circuit. Each delay unit includes a current supply, a capacitor, a comparator, a switch and a logic unit. A plurality of delay units can generate a plurality of multi-phase signals in a larger frequency range, and the phases of the multi-phase signals are correlated. The frequency and duty cycle of the multiphase signal are adjustable.

Description

technical field [0001] The present invention relates to power management, in particular to a multiphase oscillator for power management. Background technique [0002] Currently, with the continuous expansion of its functions and applications, variable frequency multiphase oscillators are becoming more and more popular. Variable frequency multiphase oscillators are widely used in various power management units (PMUs) to generate complex clock signals to drive other components. In other words, the variable frequency multiphase oscillator can provide signals of various phases (polyphase) to various components, such as a DC / DC converter. In practice, a variable frequency multiphase oscillator needs to provide a multiphase signal to synchronize multiple components connected to it. Oscillators usually determine their own frequency based on a combination of one or more of internal inductance, resistance, capacitance, or other necessary components. [0003] For example, a variabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02M3/155
Inventor 克劳帝斯·旦
Owner O2 MICRO INT LTD