Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2005-09-06
2009-10-20
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S055000, C327S057000, C327S067000
Reexamination Certificate
active
07605615
ABSTRACT:
There is provided a voltage comparator circuit with even lower power consumption. It comprises an FET Q1, to the gate of which a signal input terminal IN1is connected, an FET Q2, to the gate of which a signal input terminal IN2is connected, a bistable circuit, an AND circuit G, and an FET Q11. A pulse signal φ, which becomes a strobe signal for the comparison, is supplied to the bistable circuit, and when the pulse signal φ is at a low level, the logic values of output terminals OUT1and OUT2go to a high level, and the output of the AND circuit G becomes high, turning the FET Q11on. When the pulse signal φ changes to a high level from a low level, input voltages are compared, one of the output terminals OUT1or OUT2changes to a low level, corresponding to the value relationship between the drain currents of the FETs Q1and Q2, and the output of the AND circuit G goes to a low level, turning the FET Q11off. The power consumption is reduced because the source currents of the FETs Q1and Q2flow only during a short period of time when the operation of comparison is being performed.
REFERENCES:
patent: 5600269 (1997-02-01), Song et al.
patent: 6417699 (2002-07-01), Barnes
patent: 7049853 (2006-05-01), Wang
patent: 2-34490 (1990-08-01), None
patent: WO 03/075461 (2003-09-01), None
G.M. Yin et al., “A High-Speed CMOS Comparator with 8-b Resolution,” (USA), IEEE Journal of Solid-State Circuits, vol. 27, No. 2, Feb. 1992, pp. 208-211.
European Search report dated Jan. 17, 2006.
Donovan Lincoln
McGinn IP Law Group PLLC
NEC Electronics Corporation
Rojas Daniel
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