[특허]Single supply headphone driver/charge pump combination

Maxim Integrated Products, Inc.

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특허 상세정보

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내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Single supply headphone driver/charge pump combination

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03F-003/04
미국특허분류(USC)	330/297; 330/296
출원번호	US-0056994 (2002-01-24)
발명자 / 주소	Doy,Tony
출원인 / 주소	Maxim Integrated Products, Inc.
대리인 / 주소	Perkins Coie LLP
인용정보	피인용 횟수 : 47 인용 특허 : 10

초록

A headphone driver amplifier operative from a single DC voltage supply, coupled directly to the headphone speakers without the need for DC coupling capacitors used for preventing DC reaching the headphones. An onboard power supply generates a negative voltage rail which powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (0 volts), no significant DC voltage exists across the speaker load and the need for DC coupling capacitors is eliminated.

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I claim: 1. An amplifier circuitry for directly driving stereo headphones, said amplifier circuitry being driven by a single supply voltage VDD, said amplifier circuitry comprising: a first and a second amplifier, the first amplifier having an output directly coupled to a first headphone and the second amplifier having an output directly coupled to a second headphone, each of the first and second amplifier having a VDD power supply lead connected to a positive voltage supply VDD; and a charge pump circuitry output connected to a-VDD supply voltage of the first and second amplifier, wherein said charge pump circuitry output provides a voltage substantially equal in magnitude to the negative value of the VDD supply, said charge pump further having a power supply lead connected to the VDD supply voltage. 2. A direct drive charge pump enabled stereo headphone system comprising the following formed on a single integrated circuit; a single power input for providing, internal to said integrated circuit, a VDD supply voltage originating external to said integrated circuit; a charge pump coupled to said single power input and operable to provide, internal to said integrated circuit, a voltage substantially equal in magnitude to the negative value of said external VDD supply; a first headphone amplifier power by both said external VDD supply and said voltage substantially equal in magnitude to the negative value of said external VDD supply, said first headphone amplifier having a first audio input driven by a first audio signal provided external to said integrated circuit, and a first audio output suitable for directly driving a stereo headphone; a second headphone amplifier powered by both said external VDD supply and said voltage substantially equal in magnitude to the negative value of said external VDD supply, said second headphone amplifier having a second audio input driven by a second audio signal provided external to said integrated circuit, and a second audio output suitable for directly driving said stereo headphone; and whereby a single ground reference may be used for both said headphone system and said stereo headphone such that substantially no DC bias voltage exists across said first audio input and said second audio input with reference to said stereo headphone. 3. A direct drive charge pump enabled stereo headphone system as recited in claim 2, wherein said first audio input is an audio in for a right stereo headphone and said second audio input is an audio in for a left stereo headphone. 4. A direct drive charge pump enabled stereo headphone system as recited in claim 2, wherein said first audio input is coupled to an inverting terminal of said first headphone amplifier and said second audio input is coupled to an inverting terminal of said second headphone amplifier. 5. A direct drive charge pump enabled stereo headphone system as recited in claim 4, wherein a non-inverting terminal of said first headphone amplifier is coupled to a non-inverting terminal of said second headphone amplifier. 6. A direct drive charge pump enabled stereo headphone system as recited in claim 5, wherein said non-inverting terminal of said first headphone amplifier and said non-inverting terminal of said second headphone amplifier are coupled to ground. 7. A direct drive charge pump enabled stereo headphone system as recited in claim 2, further comprising: a first resistor coupled to said first audio input and an inverting terminal of said first headphone amplifier, a second resistor coupled to said first audio output and said inverting terminal of said first headphone amplifier, a third resistor coupled to said second audio input and an inverting terminal of said second headphone amplifier, and a fourth resistor coupled to said second audio output and said inverting terminal of said second headphone amplifier. 8. A direct drive charge pump enabled stereo headphone system as recited in claim 2, further comprising: a first capacitor having a first lead and a second lead, said first lead coupled to said charge pump and said second lead coupled to said charge pump, said first capacitor located off said integrated chip, and a second capacitor having a first lead and a second lead, said first lead coupled to said charge pump and said second lead couple to ground, said second capacitor located off said integrated chip. 9. A direct drive charge pump enabled stereo headphone system as recited in claim 2, further comprising a short circuit protection device. 10. A direct drive charge pump enabled stereo headphone system as recited in claim 2, further comprising a bias circuitry device. 11. A direct drive charge pump enabled stereo headphone system as recited in claim 2, wherein said first audio output is an audio out for a right stereo headphone and said second audio output is an audio out for a left stereo headphone. 12. A direct drive charge pump enabled stereo headphone system as recited in claim 2, further comprising a click/pop suppression device coupled to said first headphone amplifier and said second headphone amplifier. 13. A direct drive charge pump enabled stereo headphone system as recited in claim 2, further comprising a shutdown control device coupled to said charge pump. 14. A direct drive charge pump enabled stereo headphone system as recited in claim 12, further comprising a shutdown control device coupled to said charge pump and said click/pop suppression device. 15. A direct drive charge pump enabled stereo headphone system as recited in claim 2, further comprising: a first capacitor having a first lead and a second lead, said first lead coupled to a non-inverting terminal of said first headphone amplifier and said second lead coupled to said first audio input, said first capacitor located off said integrated chip, and a second capacitor having a first lead and a second lead, said first lead coupled to a non-inverting terminal of said second headphone amplifier and said second lead coupled to said second audio input, said second capacitor located off said integrated chip.

이 특허에 인용된 특허 (10)

이 특허를 인용한 특허 피인용횟수: 47

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특허 상세정보

Single supply headphone driver/charge pump combination

초록

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이 특허에 인용된 특허 (10)

이 특허를 인용한 특허 피인용횟수: 47

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특허 상세정보

Single supply headphone driver/charge pump combination

초록

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이 특허에 인용된 특허 (10)

이 특허를 인용한 특허 피인용횟수: 47

IPC 상위 출원인

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상세정보조회

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IPC 상세정보(version : 201201)

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