Scanning type image sensor

Details Scanning type image sensor Scanning type image sensor

1989-11-16

1992-03-17

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821331, H04N 314, H04N 5335

Patent

active

050973380

ABSTRACT:
An image sensor includes a photodiode array having a number of photodiodes arranged in a linear line. Each of the photodiodes is connected to each of analog switches which are sequentially turned-on by a drive pulse. Each analog switch includes a parallel connection of a P-channel MOS-FET and an N-channel MOS-FET having the same gate capacitance. The drive pulse is applied to a gate of the P-channel MOS-FET through one inverter and to a gate of the N-channel MOS-FET through two inverters being connected in a cascade fashion. A delay time of the one inverter and a total delay time of the two inverters are set to be equal to each other, and therefore, the two MOS-FETs are simultaneously turned-on or -off in response to the same drive pulse. A dummy switch composed of a complementary MOS-FET circuit which acts in a completely reversed phase with respect to the analog switch is provided, and a switching noise occurring in the analog switch and a switching noise occurring in the dummy switch are canceled with each other at an output terminal.

REFERENCES:
patent: 4145721 (1979-03-01), Beaudouin et al.
patent: 4301477 (1981-11-01), Takemoto et al.
patent: 4652767 (1987-03-01), Tajiri et al.
patent: 4733097 (1988-03-01), Iwabuchi et al.
patent: 4994877 (1991-02-01), Ino et al.

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