Glitch compensation in electronic circuits
AssigneeFirecomms Limited
InventorsColm Donovan, Ciaran Cahill, Patrick Murphy
Life of this patent
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Abstract
A supply circuit for providing pulses of current has a current source, a reference voltage source for controlling magnitude of the current, and a current switch for controlling whether or not the current passes through a load. Also, there is a switch control signal terminal for controlling the current switch, and glitch compensation elements including at least one capacitance circuit and associated capacitor drive circuit for feeding a variable correcting voltage back to the reference voltage, and a controller to control said variable voltage.
Claims11
A supply circuit for providing pulses of current, said supply circuit comprising:
- a current source,
- a reference voltage source for controlling magnitude of current delivered by said current source,
- a current switch for controlling whether or not said current passes through a load,
- a switch controller for controlling the current switch, and glitch compensation elements comprising:
- a plurality of capacitors configured to apply a correcting charge to the reference voltage source in response to switching on said current switch;
- at least one drive element for delivering correcting charges to said capacitors;
- and
- a glitch compensation controller configured to control said correcting charge in response to one or more parameters of the supply circuit by:
- enabling or disabling said capacitors, or by
- controlling said drive elements to alter maximum and minimum charge applied by the drive elements to the capacitors, said correcting charge being coincident in time, and equal in magnitude, and of opposite polarity to a glitch-causing parasitic charge.
A drive circuit for a communication system, comprising a supply circuit, said supply circuit comprising:
- a current source,
- a reference voltage source for controlling magnitude of current delivered by said current source;
- a current switch for controlling whether or not said current passes through a load,
- a switch controller for controlling the current switch, and
- glitch compensation elements comprising:
- a plurality of capacitors configured to apply a correcting charge to the reference voltage source in response to switching on said current switch;
- at least one drive element for delivering correcting charges to said capacitors;
- and
- a glitch compensation controller configured to control said correcting charge in response to one or more parameters of the supply circuit by:
- enabling or disabling said capacitors, or by controlling said drive elements to alter maximum and minimum charge applied by the drive elements to the capacitors,
- said correcting charge being coincident in time, and equal in magnitude, and of opposite polarity to a glitch-causing parasitic charge.
Dependencies are inferred from the claim text.