Patent ID: 7423565
Filing Date: 2008-09-09
Classification: H03M

Abstract:
1. Apparatus for comparing a digitized analog signal with a digital signal, the comparison of the digitized analog signal and the digital signal being applied to a processing unit, the apparatus comprising: a sequential control unit, the sequential control unit supplying control signals; a multiplexer having a plurality of analog signals applied to input terminals thereof, the control signals selecting the analog signal to be digitized; an analog-to-digital converter, the analog-to-digital converter digitizing the selected analog signal; a plurality of buffer register pairs; a switch unit responsive to the control unit for selecting one of the buffer register pairs; a first buffer register of a selected buffer register pair coupled to the switch unit, the first buffer register storing the digitized signal; a second buffer register of the selected buffer register pair being coupled to an output of the switch unit storing the digital signal that has been digitized by the analog-to-digital converter; and a comparator having first input terminal coupled to the first buffer register, the comparator having a second input terminal coupled to the second buffer register, the output terminal of the comparator providing a comparison between the digitized and digital signals to the processing unit in response to the control signals.