Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Reexamination Certificate
2007-06-19
2007-06-19
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
C341S156000
Reexamination Certificate
active
11017923
ABSTRACT:
A voltage subtracting circuit includes a conversion circuit, a holding circuit, and a differential voltage generator. The conversion circuit converts a first voltage input during a first period into a first current proportional to the first voltage. The conversion circuit further converts a second voltage input during a second period following the first period into a second current proportional to the second voltage. The holding circuit holds the first current during the first period as a third voltage. The holding circuit further outputs the first current during the second period on the basis of the third voltage. The differential voltage generator outputs a differential voltage between the second voltage and the first voltage during the second period on the basis of the second current output by the conversion circuit and the first current output by the holding circuit.
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Hiroki Ishikuro, et al., “A Single-Chip CMOS Bluetooth Transceiver with 1.5MHz IF and Direct Modulation Transmitter”, ISSCC Digest of Technical Papers, ISSCC 2003, Session 5, Wireless-Pan Transceivers, Paper 5.5, Feb. 2003, pp. 94-95.
Katsuji Kimura, “A CMOS Logarithmic IF Amplifier with Unbalanced Source-Coupled Pairs”, IEEE Journal of Solid-State Circuits, vol. 28, No. 1, Jan. 1993, pp. 78-83.
Kabushiki Kaisha Toshiba
Wells Kenneth B.
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