Low-swing CMOS input circuit

Details Low-swing CMOS input circuit Low-swing CMOS input circuit

2011-06-28

2011-06-28

Barnie, Rexford N (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S083000, C327S333000

Reexamination Certificate

active

07969191

ABSTRACT:
The invention relates to a CMOS input circuit for receiving low-swing input signals, which is an alternative to the CMOS input circuits as known from the prior art. The CMOS input circuit according to the invention comprises a leveling circuit (LC) that is constructed for arranging, under control of a voltage associated with an output voltage of a CMOS input stage (Inv1), a leveling transistor (M3) which is located in a supply path of the CMOS input stage (Inv1), (i) as a forward-biased diode-connected transistor for regulating the voltage on a source of the CMOS input stage (Inv1) for reducing the gate-source voltage of a switching transistor (M1, M2) in the CMOS input stage (Inv1), when an input voltage of the CMOS input circuit assumes a level associated with a first logical level causing the switching transistor (M1, M2) to be switched off, and (ii) as a conductive path when the input voltage assumes a level associated with a second logical level causing the switching transistor (M1, M2) to be switched on. The invention also relates to an Input-Output circuit, an electronic circuit and a semiconductor device comprising such CMOS input circuit. The invention provides an alternative to known CMOS input circuit that make use of a diode-connected transistor that is short-circuited in case of one of the input voltage levels. An advantageous embodiment of the invention incorporates a positive feedback mechanism that makes the circuit more suitable for low supply voltages.

REFERENCES:
patent: 4593212 (1986-06-01), Svager
patent: 4825106 (1989-04-01), Tipon
patent: 5378943 (1995-01-01), Dennard
patent: 5650742 (1997-07-01), Hirano
patent: 5789942 (1998-08-01), Mizuno
patent: 6225838 (2001-05-01), Lee
patent: 6429683 (2002-08-01), Miller et al.
patent: 7119578 (2006-10-01), Correale et al.
patent: 7382159 (2008-06-01), Baker
patent: 7671629 (2010-03-01), Zhang et al.
patent: 19719448 (1998-11-01), None
patent: 0595318 (1994-05-01), None
ISA/EPO, International Search Report dated May 4, 2009 for PCT/IB2009/050401.

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