Aperture correction signal processing circuit

H - Electricity – 04 – N

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350/56

H04N 5/14 (2006.01) H04N 5/208 (2006.01)

Patent

CA 1124844

ABSTRACT OF THE DISCLOSURE An aperture correction signal processing circuit includes first and second differential amplifiers, each consisting of first and second transistors. The respective first transistors of the first and second differential amplifiers are applied at respective base electrodes thereof with first and second aperture correction signals, which are opposite in phase to each other, while the base elec- trodes of the respective second transistors of the first and second differential amplifiers are connected to each other and fed with a variable bias voltage. The common electrodes of the first and second transistors of the first differential amplifier are connected to each other and further to a variable constant-current source, while the common electrodes of the first and second transistors of the second differential amplifier are connected to each other and further to a variable constant-current source, both of the above sources being simultaneously controllable. Thus, output signals from the first and second differential amplifiers are fed to the base electrode of a transistor for being added together to obtain an aperture correction signal free from noise at its emitter electrode.

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