Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1997-03-21
1999-08-10
Le, Dinh
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327100, 327355, 341154, H03K 1728, H03K 519
Patent
active
059364505
ABSTRACT:
A waveshaping circuit, which includes a controller and current summing circuitry controlled by the controller. The controller receives a binary data signal and generates a different set of control signals in response to each of at least two bit patterns of the data signal. The current summing circuitry selectively sinks combinations of component currents in response to sequences of the control signal sets to generates an output current signal having a desired waveform. The current summing circuit can be controlled to operate in a two-stage cycle: a first stage generating a first partial current signal whose waveform determines a first portion of the transmit waveform of the output signal, and a second stage generating a second partial current signal whose waveform determines a second portion of such transmit waveform. The first and second partial output current signals can be amplified and one subtracted from the other to generate an output signal whose waveform complies with a twisted-pair specification of the IEEE 802.3 Ethernet Protocol. Preferably, the current summing circuit includes modules, each including high precision switch circuitry which steers a component current from a source to one of multiple output nodes, or from the source to a waste node in response to one or more control signals indicating that no current should be steered to any of the output nodes. Preferably, the controller has synchronous design in the sense that it operates in response to clock signal edges of a single polarity.
REFERENCES:
patent: 5200712 (1993-04-01), Srivastava
patent: 5200751 (1993-04-01), Smith
patent: 5357145 (1994-10-01), Seagram
patent: 5410188 (1995-04-01), Segaram
patent: 5663728 (1997-09-01), Essenwanger
Le Dinh
National Semiconductor Corporation
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