A 0.7-V low-phase-noise multi-mode coupled class-B/class-C voltage-controlled oscillator for millimeter-wave applications

A 400[Formula: see text][Formula: see text]W near-threshold supply class-C voltage controlled oscillator (VCO) with amplitude feedback loop and auto amplitude control (AAC) is proposed in this paper. The amplitude feedback loop and AAC ensure the robust startup of the proposed VCO and automatically adapts it to the class-C mode in steady state. Consequently, ultra-low power can be achieved in AAC mode and low phase noise, high swing can be achieved in AAC off mode. The proposed VCO with AAC gets ultra-low power consumption by limiting the oscillating amplitude and driving the proposed VCO into the deep Class-C mode. Additionally, the peak value detector is employed in this work to boost the controlling voltage of capacitors bank. Thus, a low on resistance of switch transistors is obtained, which increases the Q value of capacitors bank. The simulated phase noise is [Formula: see text]124.5[Formula: see text]dBc/Hz at 1[Formula: see text]MHz offset with the 1.16[Formula: see text]GHz oscillation frequency. In this case, the figure-of-merit including tuning range (FOMT) of proposed VCO is [Formula: see text]195[Formula: see text]dBc/Hz. The proposed VCO is fabricated in SMIC 40[Formula: see text]nm CMOS process and consumes 0.62[Formula: see text]mA from 0.65[Formula: see text]V supply. The measured phase noise is [Formula: see text]109[Formula: see text]dBc/Hz and FOMT is [Formula: see text]179[Formula: see text]dBc/Hz.

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Low Phase Noise and Wide-Range Class-C VCO Using Auto-Adaptive Bias Technique

Electronics ◽

10.3390/electronics9081290 ◽

2020 ◽

Vol 9 (8) ◽

pp. 1290

Author(s):

Jeong-Yun Lee ◽

Gwang Sub Kim ◽

Goo-Han Ko ◽

Kwang-Il Oh ◽

Jae Gyeong Park ◽

...

Keyword(s):

Phase Noise ◽

Tuning Range ◽

Frequency Tuning ◽

Wide Frequency Range ◽

Cmos Process ◽

Voltage Controlled Oscillator ◽

Frequency Range ◽

Wide Range ◽

Class C ◽

Low Phase Noise

This paper proposes a new structure of 24-GHz class-C voltage-controlled oscillator (VCO) using an auto-adaptive bias technique. The VCO in this paper uses a digitally controlled circuit to eliminate the possibility of start-up failure that a class-C structure can have and has low phase noise and a wide frequency range. To expand the frequency tuning range, a 3-bit cap-bank is used and a triple-coupled transformer is used as the core inductor. The proposed class-C VCO implements a 65-nm RF CMOS process. It has a phase noise performance of −105 dBc/Hz or less at 1-MHz offset frequency and the output frequency range is from 22.8 GHz to 27.3 GHz, which consumes 8.3–10.6 mW of power. The figure-of-merit with tuning range (FoMT) of this design reached 191.1 dBc/Hz.

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Power Efficient Implementation of Low Noise CMOS LC VCO using 32nm Technology for RF Applications

International Journal of Emerging Research in Management and Technology ◽

10.23956/ijermt.v6i8.118 ◽

2018 ◽

Vol 6 (8) ◽

pp. 53

Author(s):

Shitesh Tiwari ◽

Sumant Katiyal ◽

Parag Parandkar

Keyword(s):

Power Consumption ◽

Phase Noise ◽

Tuning Range ◽

Low Voltage ◽

Performance Comparison ◽

Low Noise ◽

Center Frequency ◽

Voltage Controlled Oscillator ◽

Low Phase Noise ◽

Lc Vco

Voltage Controlled Oscillator (VCO) is an integral component of most of the receivers such as GSM, GPS etc. As name indicates, oscillation is controlled by varying the voltage at the capacitor of LC tank. By varying the voltage, VCO can generate variable frequency of oscillation. Different VCO Parameters are contrasted on the basis of phase noise, tuning range, power consumption and FOM. Out of these phase noise is dependent on quality factor, power consumption, oscillation frequency and current. So, design of LC VCO at low power, low phase noise can be obtained with low bias current at low voltage. Nanosize transistors are also contributes towards low phase noise. This paper demonstrates the design of low phase noise LC VCO with 4.89 GHz tuning range from 7.33-11.22 GHz with center frequency at 7 GHz. The design uses 32nm technology with tuning voltage of 0-1.2 V. A very effective Phase noise of -114 dBc / Hz is obtained with FOM of -181 dBc/Hz. The proposed work has been compared with five peer LC VCO designs working at higher feature sizes and outcome of this performance comparison dictates that the proposed work working at better 32 nm technology outperformed amongst others in terms of achieving low Tuning voltage and moderate FoM, overshadowed by a little expense of power dissipation.

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