Analog-to-digital converter with multi-level dither current inpu

Details Analog-to-digital converter with multi-level dither current inpu Analog-to-digital converter with multi-level dither current inpu

1993-09-24

1995-05-16

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

341143, H03M 120

Patent

active

054164818

ABSTRACT:
An improved sigma-delta analog-to-digital converter (ADC) is disclosed herein. The digital converter includes a dither circuit fabricated within the package of the ADC. The circuit is configured to apply a dither current to the analog input of the ADC. The frequency of the dither current is selected based upon the bandwidth of the analog signals for which the ADC is designed to sample and convert to digital signals. Application of the dither current to the input of the ADC reduces quantization noises produced as a result of certain ranges of DC offset voltages found within analog signals applied to the ADC.

REFERENCES:
patent: 4354176 (1982-10-01), Aihara
patent: 5073777 (1991-12-01), Fukuhara et al.
patent: 5305005 (1994-04-01), Nakagawa et al.

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