Low-noise PECL output driver

Details Low-noise PECL output driver Low-noise PECL output driver

2011-07-19

2011-07-19

Crawford, Jason M (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S066000, C326S068000, C326S073000, C326S086000, C327S109000, C327S333000

Reexamination Certificate

active

07982500

ABSTRACT:
An integrated circuit output driver is provided that exhibits improved performance and signal integrity. In one embodiment, circuitry for producing an oscillatory output signal having a peak voltage of V volts uses MOS transistor circuitry transistors of which are designed for a maximum port-to-port voltage of substantially less than V volts. A first inverter chain is coupled to an input signal to produce a predriver output signal. A second inverter chain of multiple of inverters including a first inverter produces a driver output signal. Circuitry is provided for AC-coupling the predriver output signal to the second inverter chain, it being configured to translate the predriver output signal to a higher voltage range to produce a translated predriver output signal. A driver transistor is controlled using the driver output signal to produce the oscillatory output signal, and circuitry coupled to the driver output transistor ensures that no port-to-port voltage of the driver output transistor exceeds the maximum port-to-port voltage.

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