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US 7,741,827 B2Granted
Parameter control circuit including charging and discharging current mirrors and method therefor
AssigneeSemiconductor Components Industries, LLC
InventorsTerry Allinder, George H. Barbehenn
Life of this patent
Estimating the term…
Abstract
In one embodiment, a single input terminal of a parameter control circuit is utilized to form two different parameters of the parameter control circuit. In another embodiment, the parameter control circuit can include charging and discharging current mirrors.
Claims14
A parameter control circuit comprising:
- a first input;
- a first current mirror having an input path and a mirror path, the input path coupled to the first input;
- a switch configured to enable or disable a first current through the mirror path of the first current mirror, wherein the first current mirror clamps the first input to a first voltage value responsively to the switch enabling the first current;
- a capacitor coupled to receive the first current;
- and
- a second current mirror having an input path and a mirror path wherein the input path is coupled to the first input, the second current mirror coupled to form a second current through the mirror path to discharge the capacitor responsively to the switch disabling the first current wherein the second current mirror is configured to form the second current with a second value that is different from a first value of the first current.
3 more elements
A method of forming a parameter control circuit comprising:
- coupling a first circuit to a first input of the parameter control circuit;
- configuring the first circuit to cause a first input current to flow through the first input and through a resistor divider and form a first current through the first circuit responsively to a control signal, wherein the first circuit clamps the first input to a first voltage value responsively to the first circuit causing the first input current to flow;
- coupling the first circuit to use the first current to form one of a first time interval or a first voltage or a first current parameter;
- coupling a second circuit to the first input;
- configuring the second circuit to cause a second input current to flow through the first input and through the resistor divider and form a second current through the second circuit responsively to the control signal disabling the first current through the first circuit;
- and
- coupling the second circuit to use the second current to form one of a second time interval or a second voltage or a second current parameter.
4 more elements
A method of forming a parameter control circuit comprising:
- configuring a switch to enable a first current control circuit to form a first input current through a first input of the parameter control circuit and through a resistor divider by clamping the first input to a first voltage value responsively to a control signal enabling the switch;
- configuring the parameter control circuit to use the first input current to form one of a first time interval or a first voltage or a first current parameter;
- configuring a second current control circuit to form a second input current through the first input and through the resistor divider responsively to the control signal causing the first current control circuit to disable the first input current;
- and
- configuring the parameter control circuit to use the second input current to form one of a second time interval or a second voltage or a second current parameter.
2 more elements
Dependencies are inferred from the claim text.