Technical Program

Paper Detail

Paper:ASP-L26.1
Session:Mixed Signal Circuits
Time:Tuesday, May 25, 16:00 - 16:18
Presentation: Lecture
Topic: Analog Signal Processing: Mixed Signal Circuits and Testing
Title: A TEMPERATURE COMPENSATED DIGITALLY TRIMMABLE ON-CHIP IC OSCILLATOR WITH LOW VOLTAGE INHIBIT CAPABILITY
Authors: Andre Vilas Boas; Motorola - Brazil Semiconductor Technology Center 
 Alfredo Olmos; Motorola - Brazil Semiconductor Technology Center 
Abstract: 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 (11.6MHz or 21.4MHz) 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 3V to 5V 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 0.5mm CMOS technology, occupies an area of 360 x 530mm2 and requires no external reference or components.
 
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