Low-distortion bandpass Sigma-Delta modulator for wireless radio receivers
2005 (English)In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 41, no 19, 1044-1046 p.Article in journal (Refereed) Published
A low-distortion bandpass sigma-delta modulator is proposed. It was found that the key to improving linearity is to add a feedforward signal path in a double-delay resonator bandpass structure. The proposed technique improves the tonal behaviour even at low oversampling ratio and can be applied for any order of modulator. Based on the proposed architecture, a fourth-order single-bit sigma-delta modulator can achieve a dynamic range of 84 dB and a spurious free dynamic range of 98 dB at 10.71 MHz with a signal bandwidth of 200 kHz, making it ideal for a narrowband IF-sampled wireless receiver designed for compliance with GSM/GPRS standards.
Place, publisher, year, edition, pages
2005. Vol. 41, no 19, 1044-1046 p.
IdentifiersURN: urn:nbn:se:kth:diva-15097DOI: 10.1049/el:20052167ISI: 000232469300005ScopusID: 2-s2.0-25444514033OAI: oai:DiVA.org:kth-15097DiVA: diva2:333138
QC 201005252010-08-052010-08-05Bibliographically approved