2.4 GHZ HETERODYNE RECEIVER FOR HEALTHCARE APPLICATION
Keywords:LNA, healthcare, VCO, mixer, Heterodyne receiver
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 receiver
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