Signal combining circuit having two A/D converters

Details Signal combining circuit having two A/D converters Signal combining circuit having two A/D converters

2005-05-03

2005-05-03

Pham, Chi (Department: 2663)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

Reexamination Certificate

active

06888852

ABSTRACT:
To provide a digital signal combining circuit having a function to combine two digital signals converted from two analog signals and a function to compensate for nonlinearity of two A/D converters upon input of one analog input signal and to convert the analog input signal to a digital signal with S/N ratio improved by about 3 dB.The digital signal combining circuit has a first inversion circuit (3), a second inversion circuit (4), an A/D converter (ADC1), a third inversion circuit (6), a fourth inversion circuit (7), another A/D converter (ADC2), a digital inversion circuit (11) and a digital mixer circuit (10). When only one analog input signal is converted to a digital output signal, the analog input signal is inputted into a positive input of the A/D converter (ADC1), an inverted analog input signal is inputted into a negative input of the A/D converter (ADC1), the inverted analog input signal is inputted into a positive input of the other A/D converter (ADC2), the analog input signal is inputted into a negative input of the other A/D converter (ADC2), and the digital inversion circuit (11) inverts a digital output from the other A/D converter (ADC2).

REFERENCES:
patent: 6172635 (2001-01-01), Nakamura et al.

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