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|Title:||A 400-MHZ 4TH-order CT bandpass ∑Δ modulator with automatic frequency tuning|
|Citation:||Loke, W.F.,Oh, C.F.,Xu, Y.P. (2005). A 400-MHZ 4TH-order CT bandpass ∑Δ modulator with automatic frequency tuning. Proceedings of the 2005 IEEE International Workshop on VLSI Design and Video Technology, IWVDVT 2005 : 83-86. ScholarBank@NUS Repository.|
|Abstract:||This paper presents the design and implementation of a high-speed Continuous-time (CT) bandpass sigma-delta modulator targeted for an Intermediate Frequency (IF) receiver with an IF of 400MHz for GSM/WCDMA application. The loop filters in the modulator is implemented with Gm-C Opamp integrators in biquad configuration. An automatic frequency tuning circuit is employed to reduce the effects of process and temperature variations on the centre frequency. Based on a commercial 0.35-μm SiGe BiCMOS process, the 4 th-order bandpass modulator is able to obtain maximum SNRs of 77dB and 62dB for the signal bands of 200 kHz and 3.84 MHz, respectively, when sampled at 1.6GHZ. © 2005 IEEE.|
|Source Title:||Proceedings of the 2005 IEEE International Workshop on VLSI Design and Video Technology, IWVDVT 2005|
|Appears in Collections:||Staff Publications|
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