A 2MHZ GFSK integrated modulator
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tapchikhgkdt@hcmute.edu.vnKeywords:
Gaussian Frequency-Shift Keying demodulator, zero-crossing detector, shape keeping one shot, Sallen-Key Butterworth low pass filter, two-stage op-ampAbstract
An efficient mixed-mode Gaussian Frequency-Shift Keying demodulator is presented. The demodulator was designed for 433-MHz receiver in which the RF signal was down converted to 2-MHz single-ended IF signal before being put in Gaussian Frequency-Shift Keying demodulator’s input. Single-channel demodulation with zero-crossing detection structure was chosen for low power demodulation. The circuit was designed in 130 nm CMOS process of GLOBALFOUNDRIES.
The demodulator is able to recover 120Kbps input data from a 2MHz GFSK signal with frequency deviation of ±100 KHz. It consumes a 4.5mA current from 3.3V power supply and occupies a silicon area of 0.687 mm2 (1239 um x 555 um).
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