Title :
An analog GFSK modulator in 0.35-μm CMOS
Author :
Darabi, Hooman ; Ibrahim, Brima ; Rofougaran, Ahmadreza
Author_Institution :
Broadcom Corp., Irvine, CA, USA
Abstract :
An analog Gaussian frequency shift keying (GFSK) modulator designed in 0.35-μm CMOS consumes 600 μA from a 3-V supply and realizes an analog implementation of the FM differential equation. The modulator operates at baseband and is intended for use in a direct-conversion Bluetooth transmitter. It achieves a frequency deviation of 160 kHz with better than ±3% accuracy. The modulator implements an amplitude control loop to achieve a well-defined output swing. The total output harmonic distortion is less than 1%.
Keywords :
Bluetooth; CMOS integrated circuits; frequency shift keying; modulators; transmitters; 0.35 micron; 3 V; 600 muA; Bluetooth; CMOS; FM differential equation; Gaussian frequency shift keying; amplitude control loop; digital modulation; direct conversion; frequency modulation; modulator; output swing; total output harmonic distortion; transmitter; Amplitude modulation; Analog computers; Bandwidth; Capacitors; Circuits; Clocks; Differential equations; Filters; Frequency modulation; Integral equations; 65; Bluetooth; CMOS; GFSK; Gaussian frequency shift keying; digital modulation; direct conversion; frequency modulation; modulator; transmitter;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2004.836341
