Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1996-07-23
1998-04-14
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327126, 326 27, 326 87, H03K 1716, H03K 17687
Patent
active
057397074
ABSTRACT:
An integrated circuit driver for providing data to a communications channel comprises first and second output buffers coupled to first and second output conductors (e.g. bondpads) respectively. Each output buffer comprises a multiplicity of pull-up transistors and a multiplicity of pull-down transistors coupled to the associated output conductor through pull-up resistors and pull-down resistors, respectively. A multiplicity of delay circuits coupled to a data input node supply delayed data signals to the control terminals of the pull-up and pull-down transistors. Control circuitry is included for selectively activating the delay circuits. In a typical case, the control circuitry comprises multiplexers each having an output that is coupled to the input of a corresponding delay circuit. Advantages of the technique include a constant output impedance and waveshaping of the data output for reduction of harmonics. A typical application of the driver is in an Ethernet twisted-pair wire communication system, wherein external components (resistors and center-tapped transformer) may be eliminated.
REFERENCES:
patent: 4992676 (1991-02-01), Gerosa et al.
patent: 5111075 (1992-05-01), Ferry et al.
patent: 5517129 (1996-05-01), Matsui
Jerrell P. Hein et al, Tham 11.3: "A Single-Chip Digital Interface for the DSI Intraoffice Environment", Session 11: Data Communications ICs, 1989 IEEE International Solid-State Circuits Conference, ISSCC 89, Feb. 16, 1989, Trianon Ballroom, pp. 148-149.
Callahan Timothy P.
Lam T. T.
Lucent Technologies - Inc.
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