Patent ID: 6587144
Filing Date: 2003-07-01
Classification: H04N

Abstract:
An analog signal processing apparatus for a digital camera, comprising:a correlated double sampling (CDS) circuit adjusting a direct current (DC) level signal from a charge coupled device (CCD) by using a black level as a reference and converting the DC level signal into a typical video signal; an automatic the gain control (AGC) circuit automatically adjusting gain of an output signal of the CDS circuit; an analog-to-digital (A/D) converter converting an analog signal outputted from the AGC circuit into a digital image signal; a black level clamp circuit clamping the black level of a digital image signal outputted from the A/D converter for a predetermined time interval and feeding back the clamped black level to the CDS circuit; and a clock generator generating first and second clock signals and a black level clamping signal so as to control the timing of the black level clamp circuit.