Analog-to-digital converting circuit

Details Analog-to-digital converting circuit Analog-to-digital converting circuit

H - Electricity

04

N

354/70

H04N 5/92 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1171966

38/SO 1514 S81P241 ANALOG-TO-DIGITAL CONVERTING CIRCUIT ABSTRACT OF THE DISCLOSURE An analog-to-digital converting circuit comprises an input, a clock signal circuit providing first and second clock signals having the same frequency but having a half- cycle phase difference therebetween; first and second analog-to-digital converting stages each having an input coupled to the converting circuit input for receiving an input analog signal, a control terminal for receiving a respective one of the first and second control clock signals, and an output providing an N-bit binary-coded digital signal representing the level of the input analog signal, each having a voltage quantizing interval of .DELTA. V; an output terminal; and a multiplexing circuit, such as a parallel-to-serial converter, for alternately applying to the output terminal the binary coded digital signals of the first and the second analog-to-digital converting stages. In order to achieve greater accuracy, an offset circuit is included to provide to one of the first and the second analog-to-digital converting stages an offset voltage, relative to the other of such stages, of 1/2 .DELTA. V. -i-

391117

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