Analog front end circuit

Details Analog front end circuit Analog front end circuit

2007-02-06

2007-02-06

Kim, Kevin (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

C375S297000, C455S127200, C455S127500, C455S232100, C455S240100, C348S725000, C348S735000

Reexamination Certificate

active

10181079

ABSTRACT:
The present invention relates to an analog front end circuit which is preferably used for taking out an image signal from a charge coupled device, that is used as image pickup means in an electronic camera such as an electronic still camera, a video camera and the like. In the present invention, an image analog signal which is produced by, for example, the charge coupled device (CCD: not shown) is supplied to a correlated double sampling circuit (CDS)2through an input terminal1. The image analog signal is taken out through the CDS2, and the signal taken out from the CDS2is supplied to an analog type programmable gain control amplifier (PGA)4through a changeover switch3. Either the gain controlled signal by the analog PGA4or the signal sent from the changeover switch3is selected by a changeover switch5. The selected signal is further supplied to, for example, a 12-bit analog digital converter (ADC)6. The converted digital signal is supplied to a digital type programmable gain control amplifier (PGA)7comprised of, for example, a multiplier and is then taken out from an output terminal8. In this manner, the noise generation and power consumption under occasional use conditions can be minimized.

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