Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1997-05-12
1999-09-07
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341126, H03M 302
Patent
active
059493615
ABSTRACT:
A wide-band sigma-delta modulator is disclosed having a cascade of two moators or stages, the first stage being of third or greater order and the second being of second or greater order. Both stages utilize simple ternary quantizers to avoid linearity problems associated with the digital to analog converters in the feedback paths of the modulators and to maintain stable operation. Additional zeros are placed in the noise transfer functions of third or higher order stages by means of additional feedback loops between the output of the third integrator and the second summing junction to maximize the dynamic range. The new topology significantly enhances the dynamic range of the system while hardly affecting the circuit's sensitivity with regard to some non-idealities such as finite amplifier open-loop gains or capacitor ratio mismatches. The excess dynamic range gained by these additional zeros is substantial and independent of OSR, hence, the present invention is particularly useful in wide-band applications where the OSR is inherently low. By employing only two cascaded stages, amplifier gain and capacitor ratio matching requirements are kept reasonably low.
REFERENCES:
patent: 5061928 (1991-10-01), Karema et al.
patent: 5442354 (1995-08-01), Cabler
patent: 5648779 (1997-07-01), Cabler
patent: 5760722 (1998-06-01), Harris et al.
Davis Alan J.
Fischer Godi
Gauthier Robert W.
Hoff Marc S.
Lall Prithvi C.
McGowan Michael J.
The United States of America represented by the Secretary of the
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