Jack circuit and portable type electronic apparatus and telephone set using the same
AssigneeRohm Co., Ltd.
InventorsTakenori Kato, Isao Yamamoto
Life of this patent
Estimating the term…
Abstract
In a jack circuit, in which either positive pole side terminals or negative pole side terminals of connection terminals for a microphone and of connection terminals of an output stage amplifier for outputting to a speaker form a common terminal, the output stage amplifier is an amplifier which jointly operates with a center amplifier performing virtual grounding operation and which operating source voltage is lower than the operating voltage of the microphone, the common terminal is connected to the center amplifier and the other of either the positive pole side terminal or the negative pole side terminal for the microphone is connected to a voltage line which is higher by a level to ensure the operating voltage thereof.
Claims12
A jack circuit, in which either positive pole side terminals or negative pole side terminals of connection terminals for a microphone and of connection terminals of an output stage amplifier for outputting to a speaker, form a common terminal, wherein the output stage amplifier is an amplifier which jointly operates with a center amplifier performing virtual grounding operation and an operating source voltage of the output stage amplifier is lower than the operating voltage of the microphone, the common terminal is connected to the center amplifier and the other of either the positive pole side terminal or the negative pole side terminal for the microphone is connected to a voltage line which is higher by a level to ensure the operating voltage thereof.
A portable type electronic apparatus with a jack circuit, in which either positive pole side terminals or negative pole side terminals of connection terminals for a microphone and of connection terminals of an output stage amplifier for outputting to a speaker, form a common terminal, the output stage amplifier is an amplifier which jointly operates with a center amplifier performing virtual grounding operation and an operating source voltage of the output stage amplifier is lower than the operating voltage of the microphone, the common terminal is connected to the center amplifier and the other of either the positive pole side terminal or the negative pole side terminal for the microphone is connected to a voltage line which is higher by a level to ensure the operating voltage thereof.
A telephone set with a jack circuit, in which either positive pole side terminals or negative pole side terminals of connection terminals for a microphone and of connection terminals of an output stage amplifier for outputting to a speaker, form a common terminal, wherein the output stage amplifier is an amplifier which jointly operates with a center amplifier performing virtual grounding operation and an operating source voltage of the output stage amplifier is lower than the operating voltage of the microphone, the common terminal is connected to the center amplifier and the other of either the positive pole side terminal or the negative pole side terminal for the microphone is connected to a voltage line which is higher by a level to ensure the operating voltage thereof.
Dependencies are inferred from the claim text.