Push pull high-swing capable differential signaling circuits

Details Push pull high-swing capable differential signaling circuits Push pull high-swing capable differential signaling circuits

2006-10-27

2008-03-25

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

C327S112000, C326S083000

Reexamination Certificate

active

07348810

ABSTRACT:
A novel push-pull differential signaling circuit architecture exceptionally suited for 2-wire transceiver implementations is disclosed. The invention Class-B differential signaling (CBDS) architecture fully utilizes equivalent current sources connecting from the positive power rail and to the negative power rail to generate a ‘true-differential’ signal in a differential interconnect pair. By adopting a ‘Class B’ or push-pull drive structure, the invention architecture maximizes power efficiency, improving upon traditional differential signaling implementations by a factor of 2 or more. A novel combination of a bias circuit and the Class B output drive circuit ensures that the push and pull currents are very closely matched over fabrication process, voltage and temperature. The current mode operation and bi-lateral nature of the output driver ensures that there are no current spikes in the power supply connecting to the invention circuits, thereby minimizing on-chip decoupling capacitance requirements. Due to the symmetry in the push and pull current action, EM emissions from the external interconnect pair is greatly reduced, allowing much higher current drive (14 mA) and correspondingly higher voltage swings.

REFERENCES:
patent: 6111431 (2000-08-01), Estrada
patent: 6600346 (2003-07-01), Macaluso
patent: 7012450 (2006-03-01), Oner et al.
patent: 7030665 (2006-04-01), Takeuchi
patent: 7196556 (2007-03-01), Nguyen et al.
patent: 7202710 (2007-04-01), Carvajal et al.
patent: 7236018 (2007-06-01), Wang et al.

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