SIGNAL PROCESSING CIRCUIT AND SOLID−STATE IMAGE PICKUP DEVICE
摘要
A VI converting circuit (40<sb>n</sb>) receives a voltage outputted from a holding circuit (30<sb>n</sb>), converts the received voltage into a current according to the resistance of a resistor (R<sb>40</sb>), and outputs the current from the source terminal of a MOS transistor (T<sb>40</sb>). An amplifier (A<sb>40</sb>) has a sufficient open−loop gain, and the MOS transistor (T<sb>40</sb>) operates in a saturated region. The current I outputted from the VI converting circuit (40<sb>n</sb>) is proportional to the voltage V inputted into the VI converting circuit (40<sb>n</sb>), and their relation is expressed by [I = V/R] where R is the resistance of the resistor (R<sb>40</sb>).
