Level shifter
AssigneeKoninklijke Phillips Electronics N.V.
InventorMarco Berkhout
Life of this patent
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Abstract
The invention relates to a push-pull amplifier having a level shift circuit to generate different control signals to a driver of a switch. The amplifier has to cope with the voltage limitations of the device. To reduce standby power the level shifter is used. The solution of the invention has as one of the great advantages that only during transitions a current will flow.
Claims4
Push-pull amplifier having an input for receiving an input signal and an output for supplying an output signal, which push-pull amplifier comprises a pulse width modulator comprising at least two integrators, a comparator and a feed back element, switching unit having at least two switches coupled to the output of the pulse width modulator and a demodulator filter coupled to the output of the switching unit characterized in that a switching unit comprises a four phase level shift circuit for generating four different control signals to at least one driver of at least one switch.
Method of level shifting comprising the steps of generating different control signals to a driver of a switch.
Dependencies are inferred from the claim text.