Current source driver for common ground signal interface

Details Current source driver for common ground signal interface Current source driver for common ground signal interface

2011-05-03

2011-05-03

Gesesse, Tilahun (Department: 2618)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S556100, C455S556200, C455S558000, C455S559000

Reexamination Certificate

active

07937109

ABSTRACT:
A mobile computing device comprises a housing, a memory, a first current source driver, an audio interface and a processing circuit. The housing is configured to be held in a hand during use. The memory is configured to store audio data. The audio interface comprises a first terminal, a second terminal, and a common ground terminal for the first and second terminals. The processing circuit is configured to control the first current source driver to provide a first audio signal on the first terminal based on the audio data.

REFERENCES:
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patent: 7292876 (2007-11-01), Bosch et al.
patent: 7373169 (2008-05-01), Yoshino
patent: 7594059 (2009-09-01), Townsend
patent: 7623667 (2009-11-01), Sander et al.
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patent: 2006/0222021 (2006-10-01), Ruff
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patent: 2008/0140902 (2008-06-01), Townsend
APEX Microtechnology Corporation; “Voltage to Current Conversion”, Application Note 13, Feb. 2007; pp. 1-3.

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