Abstract
This paper presents a new pulse shaping technique to achieve an improved and optimized power spectral density for wireless body area network applications. A half sine-offset quadrature phase shift keying modulation is chosen to approach the standard demands on a direct modulation transmitter. Proposed technique is based on the direct multiplexing architecture and is implemented with nearly passive elements. A switched-resistor based structure which works with cooperating of digital pulse generator (DPG), acts as a semi-digital filter for half-sine pulse shaping. Besides, this technique has the capability of being implemented in any data rates up to 50 Mbps by applying a phase locked loop in DPG block. For the first side lobes of power spectral density − 26 dBc is achievable by using this technique; while the proposed modulator consumes just 200 uA current from power supply. Post layout simulation results show the adjacent channel power ratio of − 30 dBc for OQPSK modulation at 50 Mbps and maximum output power is − 9 dBm. The transmitter consumes the power of 5.7 mW from 1.5 V power supply.
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