Low-voltage, low-skew differential transmitter
OwnerBradley Davis, Raymond Jansons +1inventors
InventorsBradley Davis, Raymond Jansons, Robert Woodside
Life of this patent
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Abstract
A differential transmitter uses an H-bridge driver with upper and lower current paths switched in opposite phases. Switching occurs at the lowest level of each column of the H-bridge driver, thereby allowing the use of thin-gate transistors for high speed. One or more transistors in each column are provided to assure consistent performance across a wide range of PVT variations, and to provide the required short-circuit, ESD, and latch-up protection. A scaled copy of a column of the H-bridge driver provides replica biasing to effect the required voltage shift from core to I/O voltage levels.
Claims17
A differential transmitter comprising:
- an H-bridge driver comprising:
- a pair of substantially identical columns of devices that are configured to receive a pair of differential input signals, each column of the pair of columns being configured to provide an output signal of a pair of differential output signals for coupling to a load that bridges the pair of columns, wherein each column includes a series connection of devices between a first supply voltage and a second supply voltage, and the differential input signals are configured to control a switching device that is at an end of each of the series connection of devices between the first supply voltage and the second supply voltage.
Dependencies are inferred from the claim text.