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868 /915 MHz Radio Module

868 /915 MHz Radio Module. Generic Low Power DC-200 kbps radio. VCXO MODULATION Reference crystal oscillator modulation: DC-200 kbps data rate Gaussian pulse shaping of FSK data 65 dB ACPR Transients greatly reduced. MOTIVATION

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868 /915 MHz Radio Module

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  1. 868/915 MHz Radio Module Generic Low Power DC-200 kbps radio • VCXO MODULATION • Reference crystal oscillator modulation: • DC-200 kbps data rate • Gaussian pulse shaping of FSK data • 65 dB ACPR • Transients greatly reduced • MOTIVATION • Move to less crowded 868MHz (Europe) and 915MHz (US) bands • Battery efficiency • Radio interference issues • Image rejection • Frequency stability • Bandwidth efficiency • “Listen before transmit” • Awareness of radio activity • Power level control • Data rate/coding overhead limitation • LOW POWER ARCHITECTURE • 50% reduction in power consumption • Fivefold increase in data rate • DC balancing of data not required • PLL based superheterodyne architecture • Received Signal Strength Indicator (70 dB range) • Output power level control • REALISATION • Bench top prototypes successfully tested • 3-5 m line of sight links with zero BER • TR868 prototype dimensions: 48 mm x 34 mm • Total unit cost: ~$40 • SIMULATION • ADS Circuit Envelope simulations at system and component level

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