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An audio amplifier in a standard 90-nm dual gate-oxide CMOS technology is designed for direct connection to the battery in a mobile phone. Special techniques have been applied to run it from a supply voltage of up to 5.5 V. The circuit does not require a dedicated supply voltage generator; it can be integrated on the same chip with the digital signal processor, and provides high output power, good...
A CMOS circuit is presented which performs all analog interface functions to a standard telephone subscriber line including DC and AC termination, send and receive amplification, anti-side-tone network, line loss compensation, and dialing control. All transmission parameters are software programmable and are loaded into the IC during hook-off or, if necessary, during conversation. It is fabricated...
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