The design of a low cost, low power multifunction phase-locked loop (PLL) for HomeRF application is presented. This PLL is used in reception mode, as frequency synthesizer and in a direct conversion transmitter as a frequency shift keying (FSK) modulator in the transmit mode. Experimental results showing the circuit performances are presented. All the circuits, including the loop filter capacitance, have been fully integrated on chip using 0.13µm CMOS technology.
A 2.45 GHz Multi-Controlled Oscillator (MCO) has been designed using a CMOS 0.28 µm STMicroelectronics technology for use in frequency synthesizer and open loop FSK modulation circuit in multi-band IEEE 802.15 Wireless Personal Area Network (PAN) applications. Simple structure allowing multiple frequency control has been adopted so that the VCO maintains its center frequency and tuning range throughout − 40 • C to 120 • C by the way of a Proportional To Absolute Temperature (PTAT) biasing scheme. Simulations and measurements show the sensitivity of the VCO center frequency has been reduced from 1300 ppm/ • C to 73 ppm/ • C, while a phase noise of − 96 dBc/Hz @ 1 MHz offset with a power consumption of 18 mW have been achieved.
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