Image pickup apparatus with gain controlled output amplifier

Details Image pickup apparatus with gain controlled output amplifier Image pickup apparatus with gain controlled output amplifier

H - Electricity

04

N

350/54

H04N 5/38 (2006.01) H03G 1/00 (2006.01) H04N 5/243 (2006.01) H04N 5/335 (2006.01)

Patent

CA 1185006

ABSTRACT OF THE DISCLOSURE Solid-state image pickup apparatus, such as an MOS imager, has a two-dimensional array of picture element units each formed of a photo sensitive element and a gating element. The picture unit elements discharge a signal charge onto vertical and horizontal transmitting lines in response to vertical and horizontal scanning pulses. Then, a resulting signal current is used to develop an output video signal. In order to give the output video signal a good S/N ratio, a gain-controlled current amplifier is employed. In several embodiments, the gain-controlled amplifier includes first through fourth transistors with the base-emitter junctions of the first and second transistors and of the third and fourth transistors connected in series, with a constant current source coupled to the first transistor, controlled current sources connected to the second and third transistors, and a load device coupled to the fourth transistor. In other embodiments, the gain controlled amplifier is formed of first, second, and third current mirror circuits connected in a balanced-current arrangement. Electrically variable resistances, e.g., MOS transistors, are coupled to the output transistors of the first and second current mirror circuits to control the current gain. -1-

403337

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