Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1998-10-27
2000-12-26
Phan, Trong
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
H03M 112
Patent
active
061666769
ABSTRACT:
In a correlating device, two switched-capacitor-type analog signal integrators are connected in cascade. The analog signal integrator in the first stage samples an analog input voltage at a predetermined cycle, determines the sign of the sampled value according to a binary-code sequence, integrates the sampled value, and outputs the resultant value. The analog signal integrator in the next stage samples an input voltage at a reset cycle of the analog signal integrator in the first stage, integrates the sampled value, and outputs the resultant value. This structure can prevent saturation of the correlating device without decreasing the gain of each analog signal integrator to a greet degree even when the sequence length becomes longer. Therefore, even if a high operation speed is required and if the sequence length of the binary-code sequence becomes longer, it is possible to provide a correlating device capable of achieving both an improvement of the operation accuracy and a reduction in the power consumption at a time.
REFERENCES:
patent: 5392043 (1995-02-01), Ribner
Conlin David G.
Phan Trong
Sharp Kabushiki Kaisha
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