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Integrated RC oscillator with high frequency stability, notably for an integrated switched-mode power supply

A technology of oscillators and integrated circuits, applied in power oscillators, electric pulse generator circuits, electrical components, etc., can solve problems such as insufficient frequency stability

Inactive Publication Date: 2010-06-23
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this improvement is very limited and the resulting frequency stability over the entire temperature range is still insufficient, e.g. from -40°C to +120°C

Method used

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  • Integrated RC oscillator with high frequency stability, notably for an integrated switched-mode power supply
  • Integrated RC oscillator with high frequency stability, notably for an integrated switched-mode power supply
  • Integrated RC oscillator with high frequency stability, notably for an integrated switched-mode power supply

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Embodiment Construction

[0031] As mentioned earlier, the present invention provides a new integrated RC oscillator as part of an integrated circuit.

[0032] In the following description, the integrated RC oscillator according to the invention is considered to be part of a switched-mode power supply (or SMPS), which itself is a device such as a mobile (or cellular) telephone, cordless telephone, digital camera, MP3 player , or part of a battery-powered or portable electronic device (device) such as a Personal Digital Assistant (PDA).

[0033] However, the present invention is not limited to these applications. In fact, integrated oscillators can be used in any integrated circuit that must have high frequency stability and accuracy, such as in devices that are fed a periodic clock signal, stable power efficiency, and defined harmonic interference.

[0034] Such as figure 1 Schematically shown, the small device UE notably includes a battery BAT, an integrated SMPS IS and needs to be powered at a selec...

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Abstract

An integrated oscillator (IO), for an integrated circuit, comprises i) first (CI1) and second (CI2) compensated inverters mounted in series and each comprising first (PI11;PI21) and second (PI12;PI22) plain inverters mounted in parallel and comprising transistors having channel lengths respectively shorter and longer than an optimal channel length, the first compensated inverter (CI1) having input and output terminals respectively connected to first (N1) and second (N2) nodes and the second compensated inverter (CI2) having input and output terminals respectively connected to the second node (N2) and to a third node (N3), ii) a resistor (R) having a chosen resistance value and comprising first and second terminals connected respectively to the first (N1) and second (N2) nodes, and iii) a capacitor (C) comprising first and second terminals connected respectively to the first (N1) and third (N3) nodes, and having a chosen capacitance value to charge and discharge oneself in order to periodically deliver a clock signal at the desired oscillation frequency.

Description

technical field [0001] The present invention relates to the field of integrated circuits, and more particularly, the present invention relates to oscillators that can be used in a variety of integrated circuits. Background technique [0002] As is well known to those skilled in the art, sometimes it is important to have a periodic clock signal with high frequency stability as one arbitrarily processes it. This is especially the case with switched-mode power supplies (SMPS), which are commonly used in "small" electronic devices such as mobile or cellular phones, cordless phones, digital cameras, MP3 players, or personal digital assistants (PDAs) middle. [0003] Today's state-of-the-art small electronic devices offer a large number of functions (or features) that require additional processing power, while at the same time the size of the device, especially the size of the battery, decreases to take up less and less space. For example, some mobile phones can browse the web a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K3/03
CPCH03B5/20
Inventor Z·王
Owner NXP BV
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