Based On Gsm/wcdma/tds - Cdma Standards Of Bandpass ∑ Delta Modulator Research And Design

With the development of wireless communication and the coexistence of2G,3G and4G standards, the wireless transmitters and receivers adapting to multi-standards have been hotspots these years.The digital-IF receiver moves the channel-selection,IQ demodulation operation from analog domain to digital domain. It takes advantage of the flexibility of digital circuits and can be reconfigurable to different standards more conveniently. It relieves the design complexity of analog filters as well so that all the receiver can be integrated in a single-chip more easily. The research in this paper focuses on the bandpass EA modulator which is a critical block in digital-IF receivers.This paper proposes a new discrete-time bandpass EA modulator architecture based on feedforward, noise-coupling, double-sampling and tunable-resonator techniques. It is applied in a digital-IF receiver for GSM, WCDMA and TDS-CDMA standards with25MHz center-frequency. With top-down design methodology, this paper completes the behavioral modeling, non-idealities analysis, circuit design and has been taped out and tested.With0.13μm CMOS mixed-signal process,1.2V power supply and100MHz sampling rate, post-layout simulation shows that the SNDR under GSM/WCMDA TDS-CDMA modes achieves84.73/59.89/65.24dB, respectively and DR are93/75/84dB, the power consumption is16.1mW. The FOM value can be calculated as2.9/2.0/3.4pJ/Conversion which is more power efficient compared to the publications with similar architecture and specifications.