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A temperature compensated digitally trimmable on-chip IC oscillator with low voltage inhibit capability

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2 Author(s)
Boas, A.V. ; Brazil Semicond. Technol. Center, Jaguariuna, Brazil ; Olmos, A.

The design of a temperature compensated IC on-chip oscillator and a low voltage detection circuitry sharing the bandgap reference is described. The circuit includes a new bandgap isolation strategy to reduce oscillator noise coupled through the current sources. The IC oscillator provides a selectable clock (11.6 MHz or 21.4 MHz) with digital trimming to minimize process variations. After fine-tuning the oscillator to the target frequency, the temperature compensated voltage and current references guarantees less than ±2.5% frequency variation from -40 to 125°C, when operating from 3 V to 5 V of power supply. The low voltage detection circuit monitors the supply voltage applied to the system and generates the appropriate warning or even initiates a system shutdown before the in-circuit SoC presents malfunction. The module was implemented in a 0.5 μm CMOS technology, occupies an area of 360 × 530 μm2 and requires no external reference or components.

Published in:

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on  (Volume:1 )

Date of Conference:

23-26 May 2004