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This paper presents a 2.2 GHz receiver front-end capable of an extreme current reuse, where the low-noise amplifier, the quadrature mixers and VCOs only draw 1.3 mA from a 1V supply. A careful time-variant analysis is carried out, resulting in a very accurate expression of the conversion gain and bandwidth of the downconverter. A prototype, implemented in a 90 nm CMOS technology, shows 27 dB gain...
This paper presents an energy-efficient transmitter for UWB impulse-radio. The proposed circuit uses a novel combined mixer and power amplifier to generate a Gaussian pulse with 1.25GHz bandwidth and center frequency of 7.87GHz. The combined MXR-PA includes a monolithic transformer to reach a maximum output voltage swing of 3.2Vpp. The transformer has been designed so as to maximize the transmitter...
A thorough analysis of the tank quality factor in LC oscillators using switched capacitor banks has been carry out taking into account the contribution of the switched capacitances in the off state. Analysis results, confirmed by circuit level simulations, clearly show that the contribution of the switched capacitances in off state strongly affects the quality factor of the capacitor bank, and thus...
Sub-harmonic injection locking is employed to generate the fast-hopping carriers required in UWB systems for WiMedia . A very small area 90-nm CMOS prototype synthesizes the frequencies of band group #6 with a hop time shorter than 4 ns . It occupies 0.074 mm2 and draws 30 mA from a 1.2 V supply. Phase noise at 8.71 GHz is -112 dBc/Hz at 1 MHz offset. The design is supported by a thorough analysis...
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