Abstract-A 9 mW FM-UWB receiver front-end for low data rate ( 50 kbps), short range ( 10 m) applications operating in the ultra-wideband (UWB) band centered at 7.45 GHz is described in this paper. A single-ended-to-differential preamplifier with 30 dB voltage gain, a 1 GHz bandwidth FM demodulator, and a combined (preamp/demodulator) receiver front-end were fabricated in 0.25 m SiGe:C BiCMOS and characterized. Measured receiver sensitivity is 85.8 dBm while consuming 9 mW from a 1.8 V supply, and 83 dBm consuming 6 mW at 1.5 V. 15-20 m range line-of-sight in an indoor environment is realized, justifying FM-UWB as a robust radio technology for short range, low data rate applications. Multi-user and interference capabilities are also evaluated.Index Terms-FM-UWB, frequency modulation (FM), IEEE standardization, multi-user capacity, ultra-wideband (UWB) RF receiver front-end, voltage RF preamplifier, wideband FM demodulator.