An analog GFSK modulator in 0.35-/spl mu/m CMOS |
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Authors: | Darabi H. Ibrahim B. Rofougaran A. |
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Affiliation: | Broadcom Corp., Irvine, CA, USA; |
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Abstract: | An analog Gaussian frequency shift keying (GFSK) modulator designed in 0.35-/spl mu/m CMOS consumes 600 /spl mu/A 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 /spl plusmn/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%. |
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