H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 3/02 (2006.01) H04B 14/04 (2006.01)
Patent
CA 2067635
P/8621/Special - 30 - ABSTRACT (Figure 1,2) Analogue-to-Digital converters. Digital-to-Analogue Converters and Digital Modulators In order to improve the signal-to-noise ratio of a known sigma-delta analogue-to-digital converter A, the input to the loop filter means 3, 4 (which can be regarded as an error signal between the analogue input and, ignoring imperfections in the digital-to-analogue converter 8, the analogue equivalent of the digital output), is filtered, amplified and converted to a digital signal in a second sigma-delta converter B. This digital signal is combined with the digital output of the analogue-to-digital converter A to produce an output of the two stage converter with improved signal-to-noise ratio. Phase and amplitude errors introduced before the signals are recombined are corrected for by an equalisation network which is calibrated at regular intervals by means of a test generator 18. The same technique can be employed to produce a digital-to-analogue converter, and a digital modulator, with improved signal-to-noise ratio.
Gec-Marconi Limited
Kirby Eades Gale Baker
LandOfFree
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