Method and apparatus for suppressing spurious values in a...

Details Method and apparatus for suppressing spurious values in a... Method and apparatus for suppressing spurious values in a...

2005-12-20

2005-12-20

Chang, Daniel (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S093000, C327S390000, C327S379000, C327S387000

Reexamination Certificate

active

06977527

ABSTRACT:
Methods and apparatus provide for front-end processing of a first differential output current, whereby a first differential output current is received and a second differential output current having reduced spurious content is produced. Current steering is used to divide, and reassemble, the first differential output current so as to provide an output signal with reduced spurious content. Current steering is implemented by a return-to-zero circuit that is coupled to the terminals of a first differential current output stage. During a first phase, the return-to-zero circuit provides a differential output current equal to the first differential current output. During a second phase, the return-to-zero circuit provides a differential output current equal to zero. The current steering return-to-zero circuit is implemented with MOSFETs or any other suitable electrical circuit element that provides the ability to controllably pass or refrain from passing current.

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Mead, “Differentiators”, Analog VLSI and Neural Systems, Chapter 10, 1989, pp. 163-178; no mo.

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