CMOS-compander

Details CMOS-compander CMOS-compander

1992-10-13

1994-03-08

Mottola, Steven

Wave transmission lines and networks

Amplitude compression and expansion systems

381106, H03G 706

Patent

active

052931390

ABSTRACT:
The invention relates to a compressor and an expander for use in a compander realized in CMOS-technology which is used to improve speech quality in mobile phone systems AMPS (NAMPS), NMT and TACS (JTACS, ETACS, NTACS). The compander is integrated with other functions of the mobile phone. The compressor and expander have SC-amplifiers controlled by a control logic. A double comparator XOR-block is used in the control of the amplifiers.

REFERENCES:
patent: 3828262 (1974-08-01), Trocqueme
patent: 4322579 (1982-03-01), Kleis et al.
patent: 4987383 (1991-01-01), Mauthe
IEEE 1990 Custom Integrated Circuits Conference May 13, 1990, Boston, Mass., pp. 12.7.1-12.7.4, XP167690, Kaoru Takasuka, et al., "A Sigma-Delta Based Square-Law Compandor".

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