Register with current-steering input network

Details Register with current-steering input network Register with current-steering input network

1997-09-26

2000-01-25

Tokar, Michael

Electronic digital logic circuitry

Clocking or synchronizing of logic stages or gates

326115, 326119, 326121, H03K 1900

Patent

active

060182539

ABSTRACT:
A regenerative amplifier is coupled to a combinational current-steering network to provide a combinational logic and register combination. A differential change in current on the register's input nodes due to current steering is amplified to provide complementary logic values at the output nodes of the register responsive to a clock signal. Various combinational logic functions are implemented by current steering networks. Such a configuration provides the advantages of economy of size, cost and power consumption in the combinational layout because the current steering transistors may be made smaller. Furthermore, such a configuration provides the advantage of decreased set-up time in a registered data path and immunity from external sources of noise via common mode rejection. In one embodiment, a regenerative amplifier includes cross-coupled inverters. Current steering circuits steer current between regenerative amplifier input nodes depending on the output value of the logical function implemented by the combinational network.

REFERENCES:
patent: 4039861 (1977-08-01), Heller et al.
patent: 4523301 (1985-06-01), Kadota et al.
patent: 4716320 (1987-12-01), McAdams
patent: 5552728 (1996-09-01), Lin
patent: 5627789 (1997-05-01), Kalb, Jr.

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