Low power current-mode voltage controlled oscillator for 2.4GHz wireless applications

2014 ◽  
Vol 40 (1) ◽  
pp. 92-99 ◽  
Author(s):  
Jie Jin
Keyword(s):  
Low Power ◽  
Current Mode ◽  
Voltage Controlled Oscillator ◽  
Wireless Applications

scholarly journals CMOS active inductors and transformers for wireless applications

2021 ◽  
Author(s):  
Adrian Tang
Keyword(s):  
Phase Noise ◽  
Dynamic Range ◽  
Current Mode ◽  
Voltage Controlled Oscillator ◽  
Large Signal ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Wireless Applications ◽  
Active Inductors ◽  
Active Circuit

This thesis first reviews existing work in CMOS active inductors focusing on two implementations, Wu gyrator-C and differential floating active inductors. It then proposes a new method of quantifying the performance of active inductors by introducing a figure of merit called "mean quality factor" that is better suited to the large signal behavior of active inductors. New CMOS constant-Q active inductors are proposed that are intended specifically for applications where a large signal operation in required. The thesis then proposes CMOS active transformers that are active circuit equivalents of two magnetically coupled coils. Four applications of constant-Q active inductors and active transformers namely a 2.4 GHz voltage-controlled oscillator with -119.5dBc/Hz phase noise at 1 MHz offset, a 2.4 GHz current-mode phase-locked loop with -116dBc/Hz phase noise at 1 MHz offset and 80ns lock time, a 5 MHz 100X oversampled current-mode sigma-delta modulator with 50dB dynamic range and 65dB SNR, and a 1.6 GHz QPSK phase modulator with -101dBc/Hz phase noise at 1 MHz offset are presented.

scholarly journals CMOS active inductors and transformers for wireless applications

2021 ◽  
Author(s):  
Adrian Tang
Keyword(s):  
Phase Noise ◽  
Dynamic Range ◽  
Current Mode ◽  
Voltage Controlled Oscillator ◽  
Large Signal ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Wireless Applications ◽  
Active Inductors ◽  
Active Circuit

This thesis first reviews existing work in CMOS active inductors focusing on two implementations, Wu gyrator-C and differential floating active inductors. It then proposes a new method of quantifying the performance of active inductors by introducing a figure of merit called "mean quality factor" that is better suited to the large signal behavior of active inductors. New CMOS constant-Q active inductors are proposed that are intended specifically for applications where a large signal operation in required. The thesis then proposes CMOS active transformers that are active circuit equivalents of two magnetically coupled coils. Four applications of constant-Q active inductors and active transformers namely a 2.4 GHz voltage-controlled oscillator with -119.5dBc/Hz phase noise at 1 MHz offset, a 2.4 GHz current-mode phase-locked loop with -116dBc/Hz phase noise at 1 MHz offset and 80ns lock time, a 5 MHz 100X oversampled current-mode sigma-delta modulator with 50dB dynamic range and 65dB SNR, and a 1.6 GHz QPSK phase modulator with -101dBc/Hz phase noise at 1 MHz offset are presented.

scholarly journals An Ultra-Low-Power K-Band 22.2 GHz-to-26.9 GHz Current-Reuse VCO Using Dynamic Back-Gate-Biasing Technique

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 889
Author(s):  
Xiaoying Deng ◽  
Peiqi Tan
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Tuning Range ◽  
Frequency Tuning ◽  
Cmos Process ◽  
Voltage Controlled Oscillator ◽  
Back Gate ◽  
Ultra Low Power ◽  
Current Reuse ◽  
K Band

An ultra-low-power K-band LC-VCO (voltage-controlled oscillator) with a wide tuning range is proposed in this paper. Based on the current-reuse topology, a dynamic back-gate-biasing technique is utilized to reduce power consumption and increase tuning range. With this technique, small dimension cross-coupled pairs are allowed, reducing parasitic capacitors and power consumption. Implemented in SMIC 55 nm 1P7M CMOS process, the proposed VCO achieves a frequency tuning range of 19.1% from 22.2 GHz to 26.9 GHz, consuming only 1.9 mW–2.1 mW from 1.2 V supply and occupying a core area of 0.043 mm2. The phase noise ranges from −107.1 dBC/HZ to −101.9 dBc/Hz at 1 MHz offset over the whole tuning range, while the total harmonic distortion (THD) and output power achieve −40.6 dB and −2.9 dBm, respectively.

scholarly journals Characterizing the Impact of Doppler Effects on Body-Centric LoRa Links with SDR

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4049
Author(s):  
Thomas Ameloot ◽  
Marc Moeneclaey ◽  
Patrick Van Van Torre ◽  
Hendrik Rogier
Keyword(s):  
Wireless Communication ◽  
Low Power ◽  
Multipath Fading ◽  
Doppler Spread ◽  
Excellent Performance ◽  
Wireless Applications ◽  
Doppler Shifts ◽  
Doppler Effects ◽  
The Impact ◽  
Measurement Campaigns

Long-range, low-power wireless technologies such as LoRa have been shown to exhibit excellent performance when applied in body-centric wireless applications. However, the robustness of LoRa technology to Doppler spread has recently been called into question by a number of researchers. This paper evaluates the impact of static and dynamic Doppler shifts on a simulated LoRa symbol detector and two types of simulated LoRa receivers. The results are interpreted specifically for body-centric applications and confirm that, in most application environments, pure Doppler effects are unlikely to severely disrupt wireless communication, confirming previous research, which stated that the link deteriorations observed in a number of practical LoRa measurement campaigns would mainly be caused by multipath fading effects. Yet, dynamic Doppler shifts, which occur as a result of the relative acceleration between communicating nodes, are also shown to contribute to link degradation. This is especially so for higher LoRa spreading factors and larger packet sizes.

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