Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2007-09-11
2007-09-11
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
Reexamination Certificate
active
11197053
ABSTRACT:
A circuit for providing an output current is provided. The circuit includes a differential amplifier, a transistor having a gate that is coupled to the output of the differential amplifier, a comparator, and a sense resistor that is coupled between the drain of the transistor and the input pin. One input of the differential amplifier is connected to the input pin and the other input is connected to a reference voltage. The inputs of the comparator are coupled across the sense resistor. If an external resistor is coupled to the input pin, the comparator trips. If the comparator is tripped, the current from the external resistor is mirrored to provide the output current. If the comparator is not tripped, the output current is provided from an on-chip current source.
REFERENCES:
patent: 5642064 (1997-06-01), Shimura
patent: 6028456 (2000-02-01), Littlefield
RF, RFIC & Microwave Theory Design, “Improved Cascode Current Mirror,” pp. 1-7, http://www.odyseus.nildram.co.uk/RFIC—Subcircuits—Files/Improved—CMOS—Cascode—Current—Mirror.pdf, no date.
Doyle James Thomas
Kang Dae Woon
Darby & Darby P.C.
Gaffney Matthew M.
National Semiconductor Corporation
Zweizig Jeffrey
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