Oscillator circuit having frequency jitter characteristic

A frequency jittering and oscillator technology, applied in output power conversion devices, converting continuous pulse trains into pulse train devices with required modes, electrical components, etc., can solve the problems of increasing chip area, high cost, and saving The effect of chip area and simple structure

Active Publication Date: 2009-08-05
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to generate a sawtooth voltage with low frequency variation, the C Δu Δt = I , For the magnitude of Δu is V, the magnitude of Δt is S, if the magnitude of I is uA, the magnitude of

Method used

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  • Oscillator circuit having frequency jitter characteristic
  • Oscillator circuit having frequency jitter characteristic
  • Oscillator circuit having frequency jitter characteristic

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Embodiment Construction

[0022] figure 2 It is a specific realization diagram of the reference current modulation circuit in the present invention. Wherein PMOS transistor 211, PMOS transistor 212 and PMOS transistor 213 form the first group of current mirror 21, NMOS transistor 201, NMOS transistor 202 and NMOS transistor 203 form the second group of current mirror 22, PMOS transistor 231 and PMOS transistor 232 form the third group current mirror 23. The input end of the second set of current mirrors 22 is connected to a reference current Iref. The output end of the third group of current mirrors 23 is the current Iosc, which is output to the oscillator main circuit ( Figure 750) of the current. The NMOS transistor 221 , the NMOS transistor 222 , the NMOS transistor 223 , the resistor 224 , the compensation capacitor 260 and the variable resistor network 250 form a negative feedback control loop. Wherein, the NMOS transistor 240 is to ensure that the NMOS transistor 203 works in a saturation r...

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Abstract

The invention provides an oscillator circuit with the characteristic of frequency jitter, comprising a reference current modulating circuit and an oscillator main body circuit; wherein, the reference current modulating circuit mainly comprises a fixed resistor, a variable resistance network, a compensation capacitor and a negative feedback control loop consisting of four NMOS transistors. The oscillator main body circuit comprises two transmission gates, two capacitors, a comparator, a D trigger, two current mirror, five NMOS control transistors and two inverters. By adjusting the equivalent resistance value of the variable resistance network in a control loop periodically, the reference current is modulated into current which changes periodically and is used as charging current of the oscillator, thus generating oscillating impulse, the frequency of which changes periodically. The invention has simple implementing structure and can save the area of a chip.

Description

technical field [0001] The present application relates to an oscillator circuit with a frequency dithering characteristic. Background technique [0002] In the switching power supply, the size of peripheral devices is reduced by increasing the switching frequency. However, the increase of the switching frequency has brought some disadvantages, one of which is to increase the electromagnetic interference EMI (ELECTRO-MAGNETICInterference) of the switching power supply. If the electromagnetic interference of the switching power supply is large, it will directly affect the normal operation of the load circuit connected behind and even the entire system. Therefore, the magnitude of the electromagnetic interference noise of the switching power supply has become an important reference index to measure the performance of the switching power supply. [0003] There are large di / dt and dv / dt during the fast switching process of the switching power supply, and its switching noise ene...

Claims

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Application Information

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IPC IPC(8): H03K3/0233H03K3/037H03K5/156H02M1/00H02M1/08H03H7/25
Inventor 关彦青屈艾文何朝辉
Owner CRM ICBG (WUXI) CO LTD
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