An analog GFSK modulator in 0.35-/spl mu/m CMOS

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%.

[1]  A. Papoulis,et al.  The Fourier Integral and Its Applications , 1963 .

[2]  Chan-Hong Park,et al.  A low power CMOS Bluetooth transceiver with a digital offset canceling DLL-based GFSK demodulator , 2003, 2003 IEEE International Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC..

[3]  A. Swaminathan,et al.  A 22 mW Bluetooth RF transceiver with direct RF modulation and on-chip IF filtering , 2001, 2001 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC (Cat. No.01CH37177).

[4]  John B. Hughes,et al.  Circuit architectures for high linearity monolithic continuous-time filtering , 1992 .

[5]  K. Yamamoto,et al.  A 2.4 GHz RF transceiver with digital channel-selection filter for Bluetooth , 2002, 2002 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.02CH37315).

[6]  Kenneth C. Smith,et al.  Fast amplitude stabilization of an RC oscillator , 1974 .

[7]  I. Galton,et al.  A direct-conversion single-chip radio-modem for Bluetooth , 2002, 2002 IEEE International Solid-State Circuits Conference. Digest of Technical Papers (Cat. No.02CH37315).

[8]  Duc Minh Nguyen,et al.  A single-chip CMOS Bluetooth transceiver with 1.5MHz IF and direct modulation transmitter , 2003, 2003 IEEE International Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC..

[9]  D. T. Hess.  FM differential equation , 1966 .

[10]  M. Ingels,et al.  A fully-integrated single-chip SOC for Bluetooth , 2001, 2001 IEEE International Solid-State Circuits Conference. Digest of Technical Papers. ISSCC (Cat. No.01CH37177).

[11]  J.C. Leete,et al.  A 2.4 GHz CMOS transceiver for Bluetooth , 2001, 2001 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium (IEEE Cat. No.01CH37173).

[12]  Didier Belot,et al.  A Bluetooth radio in 0.18 μm CMOS , 2002 .