A 3μm-CMOS Analogue Audio Circuit for Mobile Telephone Application

An analogue IC for mobile telephone application (Handset IC) is presented. The circuit performs the analogue functions required for the speech channels (low noise microphone amplifier, earphone driver for 130 nF load, sidetone buffer, transmit line driver, speaker line drivers, variable gain-loss st...

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Bibliographische Detailangaben
Hauptverfasser:	Melcher, Gebhard, Guerrero, Francisco, Barnthaler, Hannes, Ilzer, Karl, Strle, Drago, Groenroos, Mika
Format:	Tagungsbericht
Sprache:	eng
Schlagworte:	Analog integrated circuits Application specific integrated circuits Driver circuits Integrated circuit noise Low-noise amplifiers Microphones Noise generators Speech enhancement Telephone sets Telephony
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Beschreibung
Zusammenfassung:	An analogue IC for mobile telephone application (Handset IC) is presented. The circuit performs the analogue functions required for the speech channels (low noise microphone amplifier, earphone driver for 130 nF load, sidetone buffer, transmit line driver, speaker line drivers, variable gain-loss stage) and DTMF generation. A buzzer driver has also been integrated for general purpose system signalling. A watchdog circuit supervises the correct functioning of the microprocessor. Common time-continuous and switch-capacitor techniques have been used to minimize the number of external components.
DOI:	10.1109/ESSCIRC.1989.5468091