Title:
ANALOG SIGNAL PROCESSING DEVICE, AND CORRELATION ARITHMETIC UNIT USING THE SAME
Document Type and Number:
Japanese Patent JP3519242
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize adaptive control operation keeping the DC level of output signal Vout at a desired level against the fluctuation of a low frequent background signal component in input signal Vin and the discrepancy of an input reference level without interrupting signal processing, and reducing a spare circuit for refreshment, in a capacity combining type analog signal processing device provided with an amplifier, an input capacitor and a feedback circuit.
SOLUTION: In a comparator 22, the output signal Vout and a reference level Vth are compared with each other, and the comparison result is filtered by a low-pass filter 23 so that adaptive control signal corresponding to the background signal component is generated and fed back in negative to a signal processor 21. Thus, the background signal component is compensated by the adaptive control signal which is sufficiently alienated in frequency band from an objective signal component to be processed in the input signal Vin, so that the DC level of the output signal Vout stabilizes at the reference level Vth.
Inventors:
Iizuka, Kunihiko
Application Number:
JP14823197A
Publication Date:
April 12, 2004
Filing Date:
June 05, 1997
Export Citation:
Assignee:
SHARP CORP
International Classes:
G06G7/16; G06G7/19; H03F1/30; H03F3/70; (IPC1-7): G06G7/16; H03F3/70
Attorney, Agent or Firm:
原 謙三