Loading patent…
OwnerJohn P. Lesso, John L. Pennock +1inventors
InventorsJohn P. Lesso, John L. Pennock, Peter J. Frith
Estimating the term…
A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage.
1-40. (canceled)
An audio amplifier circuit for providing an output signal to an audio transducer, said audio amplifier circuit comprising:
A method of improving efficiency of an amplifier for providing a power output to an audio transducer, said method comprising:
Dependencies are inferred from the claim text.