Low Power Voltage Controlled And Temperature Compensated CMOS Ring Oscillator
نویسندگان
چکیده
This paper presents a CMOS voltage controlled ring oscillator (VCO) with temperature compensation circuit suitable for low-cost and low-power MEMS gas sensor. This compensated ring oscillator is dedicated to Chopper Stabilized CMOS Amplifier (CHS-A). To operate at low frequency, a control voltage generated by a CMOS bandgap reference (BGR) is described and the measurement results of the fabricated chips are presented. The output voltage of the reference is set by resistive subdivision. In order to achieve small area and low power consumption, n-well resistors are used. This design features a reference voltage of 1V. The chip is fabricated in AMS 0.35 μm CMOS process with an area of 0.032mm. Operating at 1.25V, the output frequency is within 200±l0kHz over the temperature range of -25°C to 80°C with power consumption of 810μW.
منابع مشابه
Low power, temperature and process compensated CMOS ring oscillator
The modern communication technologies require the use of CMOS monolithic oscillators because of their small manufacturing costs and high integration capabilities. The disadvantages of CMOS ring oscillators can be compensated through the use of a VCO architecture. The control voltage of this VCO should compensate for the frequency drift due to process and temperature.
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