JPS5583324A - Charge transfer type transversal filter and its driving method - Google Patents

Abstract

PURPOSE:To improve non-linearity of an output signal to an input signal by arranging a metal electrode, which is in parallel to a channel or correction channel and extending to the outside and inside of the channel, via an insulating film on channels. CONSTITUTION:The transfer part of main channel 33, formed at a part surrounded with dotted line 32 and n-type diffusion layers 27 and 31, provides the transfer and detection of signal charge and bias charge. Correction channel 37 is formed being surrounded with dotted line 36 and n-type diffusion layers 34 and 35. Transfer states of the main channel is formed of metal transfer electrodes 21-25 for single transfer. Then, metal balanced electrode 70 is arranged which is in parallel channel 33 or 37 and extending to both the inside and outside of a channel stop and then applied with direct-current voltage Vc. As a result, the area of accumulated charge becomes constant without reference to the quantity of injected charge, and consequently the accumulated charge is fixed without reference to input signal level Vi. Therefore, non-linear ion charge can completely be erased, so that non-linearity of an output signal to an input signal can be improved.