A 40 mV/4 uW CMOS Colpitts Oscillator with Additional Positive Feedback at 2.12 GHz
نویسندگان
چکیده
In this paper, a different topology for ultra-low voltage oscillators is presented. It is based on a classical common-gate Colpitts Oscillator, but with additional positive feedback provided by an inductive gate degeneration. This increase in the positive feedback decreases the required transconductance in order to start-up the circuit, which is used here to reduce the minimum supply voltage. The capacitor ratio of the circuit is also optimized with the same purpose. The equations for the optimization are presented as well as a step-by-step design. A prototype with the aim of validate the work was developed in a standard 0.13 μm CMOS process using a zero-threshold transistor. The post-layout simulation resulted in a minimum supply voltage of 40 mV at 2.12 GHz, with a power consumption of 4 μW.
منابع مشابه
20 GHz low power QVCO and De-skew techniques in 0.13μm digital CMOS
A novel VCO topology is proposed that combines the low power of –gm oscillators with the inherent buffering of Colpitts oscillators. Using this topology, a quadrature VCO (QVCO) was implemented in 0.13 μm digital CMOS consuming 32 mW at 20 GHz with just over 10% tuning range. The measured phase noise of the QVCO at 20.17 GHz is -102.41 dBc/Hz at 1 MHz offset. Because the load is isolated from t...
متن کاملA Temperature Compensation Voltage Controlled Oscillator Using a Complementary to Absolute Temperature Voltage Reference
This paper presents a temperature compensation voltage controlled oscillator (VCO) based on Cross-Coupled pair and Colpitts structures which is suitable for military fields. Also, two inductors have been used for increasing the negative conductance. By using this method, start-up condition has been improved. Two varactors and a simple capacitor bank are applied for covering a wide tunning range...
متن کاملA CMOS 180-GHz Signal Source with an Integrated Frequency Doubler
A 180-GHz signal source based on a 65-nm CMOS technology has been developed in this study. The 180-GHz signal source consists of a 90-GHz fundamental-mode Colpitts oscillator and a 180-GHz frequency doubler. A coupled-line is employed to couple two oscillator cores for generating a differential signal, which is delivered to the input of the differential-mode doubler. The fabricated signal sourc...
متن کاملQuadrature Vco Formed with Two Colpitts Vco Coupled via an Lc-ring Resonator
This paper presents a new quadrature voltage-controlled oscillator (QVCO), which consists of two p-core Colpitts cross-coupled voltage-controlled oscillators (VCOs) with an LC ring resonator to provide the quadrature outputs. The proposed CMOS QVCO has been implemented with the TSMC 0.18μm CMOS technology and the die area is 0.478×0.82mm2. At the supply voltage of 1.5V, the total power consumpt...
متن کاملA -173 dBc/Hz @ 1 MHz offset Colpitts oscillator using AlN contour-mode MEMS resonator
A differential Colpitts oscillator using AlN MEMS CMR designed in 0.13 um CMOS is presented in this work. The oscillator operates at 1.16 GHz, with a total power consumption of 4.2 mW at 1 V supply. It achieves a phase noise of -143.6 dBc/Hz, 173.3 dBc/Hz at 100 kHz and 1 MHz offset frequency respectively with a figure of merit (FOM) of 228.3 dB. Current-based temperature compensation was emplo...
متن کامل