Method and apparatus for powering a listening device
A device, such as a hearing aid, includes a microphone, an amplifier and a receiver (e.g., a speaker). A charge pump and voltage regulator circuit couples to a power source for the listening device. The charge pump and voltage regulator circuit generates a larger, smaller or same voltage output as compared to a nominal voltage of the power source for providing a proper operating voltage to the listening device.
1 . A device comprising:
a microphone having an acoustic input and a microphone output, an amplifier having a signal input coupled to the microphone output and an amplifier output;
a receiver having an input coupled to the amplifier output and an acoustic output;
a power source; and
a charge pump circuit coupling the power source to at least one of the amplifier, the microphone and the receiver.
2 . The device of claim 1 , a voltage regulator coupled to an output of the charge pump.
3 . The device of claim 2 , wherein the charge pump and voltage regulator are integrated on an integrated circuit (IC) chip.
4 . The device of claim 2 , an output of the coupled voltage regulator and charge pump being at least one of greater than the source voltage, less than the source voltage and equal to the source voltage.
5 . The device of claim 1 being incorporated into a hearing aid.
6 . The device of claim 1 , comprising a preamplifier coupled between the microphone and the amplifier, the charge pump circuit coupling the power source to the preamplifier.
7 . The device of claim 1 , comprising circuitry coupled to the charge pump to minimize electrical noise and voltage output fluctuations.
8 . The device of claim 7 , the circuitry comprising a capacitor coupled between an output of the charge pump and ground.
9 . The device of claim 1 , the microphone comprising a microphone housing, the charge pump being disposed within the microphone housing.
10 . A method of powering a device, the device comprising a microphone having an acoustic input and a microphone output; an amplifier having a signal input coupled to the microphone output and an amplifier output; a receiver having an input coupled to the amplifier output and an acoustic output; and a power source, the method comprising: coupling a charge pump circuit between the power source and at least one of the preamplifier, the amplifier, the microphone, and the receiver.
11 . The method of claim 10 , further comprising coupling a voltage regulator to an output of the charge pump.
12 . The method of claim 11 , comprising integrating the charge pump and voltage regulator on an integrated circuit chip.
13 . The method of claim 11 , comprising providing from the coupled charge pump and voltage regulator an output voltage that is greater than, less than or equal to an output voltage of the power source.
14 . The method of claim 10 , comprising disposing the charge pump within a housing for the microphone.
15 . The method of claim 10 , comprising optionally suppressing noise and voltage fluctuations in an output of the charge pump.
16 . The method of claim 10 , wherein a preamplifier is disposed between the microphone and the amplifier, the method comprising coupling the charge pump to the preamplifier.
17 . A hearing aid comprising:
a microphone having an acoustic input and a microphone output, an amplifier having a signal input coupled to the microphone output and an amplifier output;
a receiver having an input coupled to the amplifier output and an acoustic output;
a power source; and
a charge pump circuit coupling the power source to at least one of the amplifier, the microphone and the receiver.
18 . The hearing aid of claim 17 , a voltage regulator coupled to an output of the charge pump.
19 . The hearing aid of claim 18 , an output of the coupled voltage regulator and charge pump being at least one of greater than the source voltage, less than the source voltage and equal to the source voltage.
20 . The hearing aid of claim 18 , comprising a preamplifier coupled between the microphone and the amplifier, the charge pump circuit coupling the power source to the preamplifier.
21 . The hearing aid of claim 17 , comprising circuitry coupled to the charge pump to minimize electrical noise and voltage output fluctuations.