Current switch for use in telephony systems or the like

Details Current switch for use in telephony systems or the like Current switch for use in telephony systems or the like

1989-05-08

1990-07-24

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379389, 307254, H04M 908

Patent

active

049440020

ABSTRACT:
A current switch that is responsive to logic switching control signals is used in a telephone circuit comprising a handset receive signal path and a speakerphone receive signal path for separation a received voice signal into either the handset or speakerphone receive path depending on the selected mode of operation of the telephone circuit. The current switch includes a pair of switched current mirrors and clamp circuits which are rendered active or inactive depending on the particular mode of operation. The clamp circuits maintain the dc voltage appearing at the input of each current mirror constant as the particular current mirror is switched between active and inactive states thereby inhibiting audible dc transients.

REFERENCES:
patent: 4331886 (1982-05-01), Perner et al.
patent: 4492824 (1985-01-01), Bell et al.
patent: 4584520 (1986-04-01), Vinn
patent: 4712233 (1987-12-01), Kuo
patent: 4827153 (1989-05-01), Schwarz et al.

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