Low‐power contactless LC‐tank based respiratory sensor

2019 ◽  
Vol 55 (6) ◽  
pp. 304-306 ◽  
Author(s):  
B. Scheiner ◽  
S. Schellenberger ◽  
K. Shi ◽  
E. Heusinger ◽  
F. Michler ◽  
...  
Keyword(s):  
2009 ◽  
Vol 51 (8) ◽  
pp. 1970-1973 ◽  
Author(s):  
Sheng-Lyang Jang ◽  
Jyun-Yan Wun ◽  
Cheng-Chen Liu ◽  
Miin-Horng Juang

Author(s):  
Wei Cai ◽  
Frank Shi

<p class="lead">The objective of this research was to design a basic 2.4 GHz heterodyne receiver for healthcare on a 130um CMOS process. The ultimate goal for the wireless industry is to minimize the trade-offs between performance and cost, and between performance and low power consumption design. In the first part, a low noise amplifier (LNA), which is commonly used as the first stage of a receiver, is introduced and simulated. LNA performance greatly affects the overall receiver performance. The LNA was designed at the 2.4 GHz ISM band, using the cascode with an inductive degeneration topology. The second part of this thesis presents a low power 2.4 GHz down conversion Gilbert Cell mixer. In the third part, a high-performance LC-tank CMOS VCO was designed at 2.4 GHz. The design uses using PMOS cross-coupled topology with the varactor for wider tuning range topology. In the first part, a low noise amplifier (LNA) design reaches the NF of 2 dB, has a power consumption of 2.2 mW, and has a gain of 20dB. The second part of this proposal presents a low power 2.4 GHz down conversion Gilbert Cell mixer. The obtained result shows a conversion gain of 14.6 dB and power consumption of 8.2 mW at a 1.3V supply voltage. In the third part, a high-performance LC-tank CMOS VCO was designed at 2.4 GHz. The final simulation of the phase noise is-128 dBc/Hz, and the tuning range is 2.3 GHz-2.5 GHz while the total power consumption is 3.25 mW.<strong> </strong>The performance of the receiver meets the specification requirements of the desired standard.</p>


2007 ◽  
Vol 17 (3) ◽  
pp. 220-222 ◽  
Author(s):  
Shao-Hua Lee ◽  
Sheng-Lyang Jang ◽  
Yun-Hsueh Chuang ◽  
Juan-Jie Chao ◽  
Jian-Feng Lee ◽  
...  
Keyword(s):  

2007 ◽  
Vol 50 (1) ◽  
pp. 259-263 ◽  
Author(s):  
Sheng-Lyang Jang ◽  
Wei Hsung Yeh ◽  
Chien-Feng Lee ◽  
M.-H. Juang

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1336
Author(s):  
Zixuan Wang ◽  
Hongyang Wu ◽  
Xin Wang ◽  
Mingmin Shi ◽  
Shanwen Hu ◽  
...  

This paper presents a 2.4 GHz LC digitally controlled oscillator (DCO) at near-threshold supplies (0.5~0.7 V). It was a challenge to achieve a low voltage, low power, and high resolution simultaneously. DCOs with metal oxide semiconductor (MOS) varactors consume low power, but their resolution is limited. ΔΣ-DCOs can achieve a high resolution at the cost of high power consumption. A multi-stage capacitance shrinking technique was proposed in this paper to address the tradeoff mentioned above. The unit variable capacitance of the LC tank was largely reduced by the bridging capacitors and the number of stages. A current-reuse technique was used to further lower the power. Based on the above techniques, the prototype was fabricated using a 130-nm complementary MOS (CMOS) technology with multiple supplies (0.5~0.7 V for the DCO core, 1.2 V for the buffer). The measurement results showed that the phase noise at a 0.6-V supply was −126.27 dBc/Hz at 1 MHz and −125.9480 dBc/Hz at 1 MHz at the carriers of 2.4 GHz and 2.5 GHz, respectively. The best figure of merit (FoM) of 195.68 was obtained when VDD = 0.6 V. The DCO core consumed 1.1 mA at a 0.6-V supply.


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