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US 6,686,781 B2Granted
Timing control circuit
AssigneeITT Manufacturing Enterprises, Inc.
InventorRichard A. Kominsky
Life of this patent
Estimating the term…
Abstract
A timing circuit having a controllable current source and a capacitor coupled to the current source. A resistor and a second capacitor are connected in series. The series resistor and second capacitor are connected in parallel with the capacitor. A trigger circuit has a first terminal coupled to the capacitor. The trigger circuit changes states when a voltage at the first terminal exceeds a reference voltage.
Claims16
A timing circuit comprising:
- a current source;
- a first capacitor coupled to said current source;
- a first resistor and a second capacitor connected in series, the series first resistor and second capacitor being connected in parallel with said first capacitor;
- a trigger circuit having a first terminal coupled to said first capacitor, said trigger circuit changing states of a trigger circuit output when a voltage at said first terminal exceeds a reference voltage;
- said first capacitor and said second capacitor both configured to provide said voltage at said first terminal dependent upon current magnitude of said current source.
2 more elements
A timing circuit comprising:
- a current source;
- a first capacitor coupled to said current source;
- a first resistor and a second capacitor connected in series, the series first resistor and second capacitor being connected in parallel with said first capacitor, wherein a capacitance of said first capacitor is less than a capacitance of said second capacitor;
- an operational amplifier having a first terminal coupled to said first capacitor and a second terminal coupled to a reference voltage, said operational amplifier changing states of an operational amplifier output when a voltage at said first terminal exceeds the reference voltage;
- a first diode interconnecting a junction between said current source and said first capacitor and a reset terminal, said reset terminal being coupled to ground to discharge said capacitor;
- a second diode interconnecting a junction between said resistor and said second capacitor and said first reset terminal, said first reset terminal being coupled to ground to discharge said second capacitor.
3 more elements
A timing circuit comprising:
- a current source;
- a first capacitor coupled to said current source;
- a first resistor and a second capacitor connected in series, the series first resistor and second capacitor being connected in parallel with said first capacitor, wherein a capacitance of said first capacitor is less than a capacitance of said second capacitor;
- a logic gate having a first terminal coupled to said first capacitor and a second terminal coupled to a voltage establishing a logic level, said logic gate changing states of a logic gate output when a voltage at said first terminal exceeds a reference voltage dictated by characteristics of said logic gate;
- a first diode interconnecting a junction between said current source and said first capacitor and a first reset terminal, said first reset terminal being coupled to ground to discharge said first capacitor;
- a second diode interconnecting a junction between said first resistor and said second capacitor and said first reset terminal, said first reset terminal being coupled to ground to discharge said second capacitor.
3 more elements
Dependencies are inferred from the claim text.