Method and arrangement for a sigma delta converter for bandpass signals
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United States of America Patent
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Aug 15, 1989
Grant Date -
N/A
app pub date -
Jan 28, 1988
filing date -
Jan 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 occures earlier in a receiver chain and a dynamic range of about 95-98 dB is achieved.
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