Abstract
This paper presents an ultra-low power frequency modulated ultra-wideband (FM-UWB) transmitter implemented in standard 130nm CMOS technology. The transmitter operates in the range of 3.5–4.5GHz with 4GHz RF carrier frequency. The transmitter can accept input data rates up to 250kbps. A relaxation oscillator is used to generate the subcarrier signal and a VCO for RF carrier generation. The center frequency of the VCO is periodically calibrated to avoid out of band operation. An integer-N phase-locked loop (PLL) is used for both subcarrier generation and RF VCO calibration, which needs only 500ns to complete the calibration. A class-AB power amplifier is used to output the power under the FCC mask. The proposed FM-UWB transmitter consumes 750μW from a 1.2V supply.
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