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| Title: | A 400-MHZ 4TH-order CT bandpass ∑Δ modulator with automatic frequency tuning | Authors: | Loke, W.F. Oh, C.F. Xu, Y.P. |
Issue Date: | 2005 | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/83325 | ISBN: | 0780390067 |
| Appears in Collections: | Staff Publications |
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