H - Electricity – 03 – M
Patent
H - Electricity
03
M
325/110, 354/97
H03M 3/00 (2006.01) H03M 3/04 (2006.01) H04B 14/06 (2006.01)
Patent
CA 1292519
ABSTRACT OF THE DISCLOSURE An improved apparatus and method for a sigma delta converter for bandpass signals is disclosed, suitable for use in mobile radio applications, between the front end and digital signal processing stages, that includes at least one bandpass filter, an n-level quantizer, an n- level digital-to-analog (D/A) converter, and a direct current (DC) feedback network. The sigma delta converter for bandpass signals may be configured in a second order or a fourth order embodiment and achieves analog-to- digital conversion of a signal having a non-zero frequency carrier or suppressed carrier with improved signal-to-noise ratio performance and with minimal quantization error. As a result, the sigma delta conversion occurs earlier in a receiver chain and a dynamic range of about 95-98 dB is achieved.
585306
Gailus Paul Howe
Turney William Joseph
Yester Francis R. Jr.
Gowling Lafleur Henderson Llp
Motorola Inc.
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