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An IR-UWB transmitter was designed and fabricated with on-chip UWB antenna in 65 nm CMOS. Gaussian monocycle pulses (GMPs) were produced using up-slope and down slope of digital signal. The transmitter generated bi-phase modulated pulses of GMP and 10 GHz center frequency. 5 Gbps differential GMP was generated by Pseudorandom bit sequence of 27 with a power consumption of 7.56 mW. The energy per bit was 1.51 pJ/bit. GMP transmission was presented by on-chip antenna whose bandwidth was 23.6 GHz.