Mode-dependent, multiple bias-driven battery switch for subscriber line interface circuit
AssigneeIntersil Americas Inc.
InventorsLeonel Ernesto Enriquez, Douglas Youngblood
Life of this patent
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Abstract
A mode-dependent, battery-coupling switch for a subscriber line interface circuit (SLIC) selectively adjusts its current requirements to provide optimal current handling capability irrespective of the mode of operation of the SLIC. Where current demands of the SLIC are relatively minimal (e.g., on-hook idle mode), the bias is set at a relatively small, default value. During high current demand, such as ringing and off-hook signaling, the bias is set at a relatively large value, to maintain a low voltage drop across the battery-coupling switch.
Claims20
A method for supplying electrical power to a utility device comprising the steps of:
- (a) providing a controlled switch circuit which is operative to switchably couple an operational voltage to said utility device in association with respectively different modes of operation of said utility device;
- and
- (b) selectively adjusting current handling capability of said controlled switch circuit in accordance with said respectively different modes of operation of said utility device.
An apparatus for supplying electrical power to a utility device comprising:
- a controlled switch circuit which is operative to switchably couple an operational voltage to said utility device in association with respectively different modes of operation of said utility device;
- and
- a selectively controlled drive circuit, which is operative to selectively adjust current handling capability of said controlled switch circuit in accordance with said respectively different modes of operation of said utility device.
A battery voltage supply circuit for a subscriber line interface circuit (SLIC) having a multi-mode tip/ring amplifier unit, tip and ring outputs of which are adapted to be coupled to tip and ring conductors of a subscriber loop pair, and inputs of which are coupled to receive voice, signaling and ringing signals in accordance with the mode of operation of said SLIC, and a biasing unit, to which a battery voltage is coupled, and which is operative to controllably couple prescribed bias voltages to said tip/ring amplifier unit in accordance with said mode of operation of said subscriber line interface circuit, said battery voltage supply circuit comprising:
- a battery voltage switch circuit which is operative to switchably couple said battery voltage to said biasing unit;
- and
- a selectively controlled drive circuit, which is operative to adjust current handling capability of said battery voltage switch circuit based upon the mode of operation of said SLIC.
Dependencies are inferred from the claim text.