Television vertical ramp generator

A ramp generator comprising:

• first and second serially coupled charging capacitance means including a juncture therebetween;
• a source of potential defined between a point of supply potential and a point of reference potential;
• means, including a first source of charging current coupled between a first end of said first and second charging capacitance means and said point of supply potential and a connection between a second end of said charging capacitance means and said point of reference potential, for forming a ramp voltage across said first and second capacitance means;
• voltage division means comprising first and second end terminals and having a tap therebetween, said first end terminal connected to said point of supply potential;
• first coupling means coupled between said first end of said first and second charging capacitance means and said second end terminal of said voltage division means, for coupling said voltage division means in parallel with said first source of charging current;
• and
• second coupling means for coupling said tap to said juncture of said first and second serially coupled capacitance means for applying a second charging current to said juncture in response to the voltage at said tap;
• voltage sensing means coupled to said first end of said capacitance means for generating a control signal when said ramp voltage reaches a predetermined level;
• and
• constant current discharge means coupled between said first end of said capacitance means and said point of reference potential and responsive to said control signal for providing a constant current discharge path for said capacitance means.