Apparatus utilizing current-to-voltage conversion for transmitti

Pulse or digital communications – Cable systems and components – Transformer coupling

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375377, 370463, 370466, 370538, 333124, 333 32, 359115, H04B 300

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active

058964177

ABSTRACT:
An electronic apparatus capable of transmitting data at two or more different data rates contains transmitter circuitry, a cable connection mechanism, and an isolation transformer having a primary winding and a secondary winding. The transmitter circuitry low-pass filters digital data which the transmitter circuitry transmits to the primary winding at a first data rate. The transmitter circuitry also transmits digital data to the primary winding at a second data rate different from, typically greater than, the first data rate. The cable connection mechanism provides outgoing data from the secondary winding to the communication cable. Importantly, the transmitter circuitry is operable to generate current-sourced data signals at both data rates and then to convert the current-sourced signals into impedance-produced voltage signals that constitute the outgoing data. Current-source amplifier circuitry normally generates the current-sourced signals. Impedance circuitry then converts the current-sourced signals into the outgoing data.

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