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|Title:||Electromechanical resonator based bandpass sigma-delta modulator for wireless transceivers|
|Authors:||Xu, Y.P. |
|Citation:||Xu, Y.P.,Yu, R. (2005). Electromechanical resonator based bandpass sigma-delta modulator for wireless transceivers. Proceedings - 2005 IEEE International Workshop on Radio-Frequency Integration Technology: Integrated Circuits for Wideband Communication and Wireless Sensor Networks, RFIT 2005 2005 : 101-104. ScholarBank@NUS Repository. https://doi.org/10.1109/RFIT.2005.1598884|
|Abstract:||Bandpass Sigma-delta modulators commonly employ switch-capacitor (SC) or continuous-time (CT) loop filters. SC sigma-delta modulator can provide robust performance, but at low center frequencies. Its CT counterpart is able to operate at much high frequency, but its performance is often impaired by low-Q CT loop filters and the need of frequency tuning. In this paper, an alternative approach is introduced. Bandpass sigma-delta modulators employing electromechanical resonators as loop filter are described. As a proof-of-concept, a second- and fourth-order bandpass sigma-delta modulator are demonstrated in a 0.35-μm CMOS process using off-chip SAW resonators with a resonant frequency of 47.3MHz. The dynamic ranges, measured in a 200-kHz signal bandwidth when sampled at 189.2 MHz, are 57dB and 69dB for the second- and fouth-order modulator, respectively. The chips operate under a 3.3-V single supply with a power dissipation of 30 and 45mW, respectively.|
|Source Title:||Proceedings - 2005 IEEE International Workshop on Radio-Frequency Integration Technology: Integrated Circuits for Wideband Communication and Wireless Sensor Networks, RFIT 2005|
|Appears in Collections:||Staff Publications|
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