ISSCC 2005 / SESSION 11 / ULTRA WIDEBAND SOLUTIONS / 11 . 9 11 . 9 A 0 . 13 μ m CMOS UWB Transceiver
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چکیده
In addition to broadband gain and input matching requirements, the UWB standard also poses a tight specification on the band switching time (9ns), thus precluding the direct synthesis of frequencies by phase locking. An approach suggested for this task incorporates a single phase-locked loop (PLL) and a number of single-sideband (SSB) mixers to generate different frequencies that are present at all times and can be simply selected as the local oscillator (LO) signal [1]. Unfortunately, SSB mixing suffers from several drawbacks: (1) At least one signal applied to each “submixer” in an SSB system must contain a low harmonic distortion, a very difficult issue with respect to waveforms generated by practical gigahertz oscillators. (Reduction of harmonics by means of filtering requires a great deal of power dissipation.) (2) The port of each submixer that senses the low-distortion sinusoid must itself provide high linearity, inevitably creating a high loss and demanding a high power dissipation to amplify each final (I and Q) output and achieve levels suited to the receive and transmit mixers. (3) Even with these precautions, phase and gain mismatches at several gigahertz lead to many spurious components at the output of SSB mixers.
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