| Popis: |
1.2 V 0.2-to-6.3 GHz transceiver for a multimode radio is fabricated in a 0.13 mum CMOS technology is proposed. The transmitter achieves EVM of less than -29.5 dB at -3 dBm output from 0.2 to 7.2 GHz while consuming 69 mW, where the modulation scheme used is equivalent to 802.11a, 54Mb/s mode. Without any explicit matching components, S22 and S11 are kept less than -9.5 dB and -9.2 dB, respectively, over the frequency range from 0.1 to 6.3 GHz. To achieve wideband output matching, a parallel combination of a common-source amplifier and a source-follower buffer is used. This structure copes with both 50 Omega output resistance, and small output capacitance. The choke in the pre-power-amplifier (PPA) is also eliminated by adopting a push-pull amplifier and by using a modified envelope signal injection biasing scheme. The PPA achieves OP 1dB of 6 dBm, which corresponds to almost the rail-to- rail swing for 1.2 V power supply. |
