Driver circuit for charge coupled device

A control circuit for a charge coupled device (CCD) comprising:

• CMOS inverter means including first and second complementary MOS transistor means connected so as to respond complementarily to an input switching signal;
• means connecting said CCD to be driven by said CMOS inverter means such that said CMOS inverter provides a charge control path, including said first MOS transistor means, for the equivalent load capacitance of said CCD, said charge control path being switchable under control of said input switching signal;
• and
• control means including variable capacitance means connected in parallel with said first MOS transistor means for controlling the capacitance and the time constant of said charge control path.

A control circuit for a charge coupled device (CCD) comprising:

• CMOS inverter means including first and second complementary MOS transistor means connected so as to respond complementarily to an input switching signal;
• means connecting said CCD to be driven by said CMOS inverter means such that said CMOS inverter provides a charge control path, including said first MOS transistor means, for the equivalent load capacitance of said CCD, said control path being switchable under control of said input switching signal;
• and
• control means including a plurality of parallel-connected MOS transistors connected in parallel with said first MOS transistor means and further including gate control circuits for selectively biasing one or more of said parallel-connected MOS transistors into conduction to adjust the time constant of said charge control path.

A control circuit for a charge coupled device (CCD) comprising:

• CMOS inverter means including first and second complementary MOS transistor means connected so as to respond complementarily to an input switching signal;
• means connecting said CCD to be driven by said CMOS inverter means such that said CMOS inverter provides a charge control path, including said first MOS transistor means, for the equivalent load capacitance of said CCD, said charge control path being switchable under control of said input switching signal;
• and
• control means including a current path separate from the signal path of said input switching signal, said control means connected to said charge control path for changing the time constant of said charge control path in accordance with a continuous curve function in order to adjust the waveform by which the charge level of said load capacitance is varied.