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In this paper, two integrated low-power broadband 90 nm-CMOS analog solutions are demonstrated to demodulate the multi-gigabit BPSK/ASK signal up to 3 Gbps. In the coherent BPSK mode, a transmission speed over 2.5 Gbps is achievable with a carrier frequency range of 8.5-9.5 GHz for a total DC power consumption of 73 mW with more than 20 dB conversion gain. A minimum sensitivity of -35 dBm is demonstrated for this demodulator with 33 dB dynamic range. In the non-coherent ASK mode, a transmission speed over 3 Gbps is achieved for a carrier frequency range of 6-9 GHz at DC power consumption of 32 mW. A minimum sensitivity of -26 dBm is demonstrated for the demodulator with 21 dB dynamic range. This is the best trade-off in terms of data rate and power consumption of CMOS demodulators reported at around 10 GHz carrier frequencies.