Method and apparatus for a high speed low power comparator using

Details Method and apparatus for a high speed low power comparator using Method and apparatus for a high speed low power comparator using

1995-02-28

1996-10-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 55, 327 57, 327 64, 327 71, 327205, 327208, 327215, H03K 3023, H03K 522, H03K 3037

Patent

active

055635334

ABSTRACT:
A comparator (10) provides a high speed comparison between at least two input signals and includes at least two stages (12) and (14). Each stage (12 and 14) includes a pair of transistors (24), a complementary pair of transistors (28) and an enabling transistor (26). The stages are coupled to provide positive feedback back to the first stage (12). A controller (15) operably couples to the enabling transistors. When the first input signal (16) is at a higher voltage level than the second input signal (18), the first comparison output (20) goes low. Conversely, when the second input signal (18) is at a higher voltage level than the first input signal (16), the second comparison output (22) goes low. When the first comparison output (20) goes low, the second enabling transistor (34) is disabled by the controller (15). When the second comparison output goes low, the first enabling transistor (26) is disabled by the controller (15).

REFERENCES:
patent: 4602167 (1986-07-01), Yukawa
patent: 4845675 (1989-07-01), Krenik et al.
patent: 5245223 (1993-09-01), Lim et al.

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