2.4 GHZ HETERODYNE RECEIVER FOR HEALTHCARE APPLICATION
Keywords:
LNA, healthcare, VCO, mixer, Heterodyne receiverAbstract
Objective: The objective of this research was to design a basic 2.4 GHz heterodyne receiver for healthcare on a 130 um 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.
Methods: 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 proposal 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.
Results: In the first part, a low noise amplifier (LNA) design reached the NF of 2 dB, had power consumption of 2.2 mW, and had a gain of 20dB. The second part of this proposal presented a low power 2.4 GHz down conversion Gilbert Cell mixer. The obtained result showed 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 was-128 dBc/Hz, and the tuning range was 2.3 GHz-2.5 GHz while the total power consumption was 3.25 mW.
Conclusion: The performance of the receiver meets the specification requirements of the desired standard.
Keywords: LNA, healthcare, VCO, mixer, Heterodyne receiverDownloads
References
Stults BM. Preventive health care for the elderly. Western J Med 1984;141:832-45.
Trabelsi Hatem. A 3–5 GHz FSK-UWB transmitter for wireless personal healthcare applications. Int J Electronics Communication 2015;4:262-73.
Hong JH. A wireless ECG acquisition and classification system for body sensor networks. IEEE EMBS 2013;35:5183-6.
Razavi Behzad. RF Microelectronics. 2nd ed. Prentic e-Hall; 1998.
Hong EP, Hwang YS, Yoo HJ. A low power folded rf front-end with low flicker noise for direct conversion receiver. Int Solid-State Circuits Conference 2007;3:453-6.
Razavi Behzad. A study of phase noise in CMOS oscillators. IEEE J Solid State Circuits 1996;31:2-9.
Wei Cai. 2.4 GHZ hetrodyne receiver for healthcare application. Int Conf Biomed Pharm Eng 2016;8:1-8.