Filter circuit and communication device

Details Filter circuit and communication device Filter circuit and communication device

2010-05-04

2011-11-29

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

C327S554000

Reexamination Certificate

active

08067972

ABSTRACT:
A filter circuit includes a voltage-current conversion portion that converts a voltage signal input to an input terminal to a current signal, a first capacitor unit formed by a plurality of capacitors, and in which a current signal output from the voltage-current conversion portion is sequentially input to the capacitors, the unit adding and outputting electric charges of a group of capacitors to which the current signal is input, a second capacitor unit formed by a plurality of capacitors, and in which a current signal output from the first capacitor unit is sequentially input to the capacitors, the unit adding and outputting electric charges of a group of capacitors to which the current signal is input, and a plurality of connection nodes that respectively connect a given capacitor in the first capacitor unit and a capacitor in the second capacitor unit.

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Bagheri et al.; “An 800MHz to 5GHz Software-Defined Radio Receiver in 90nm CMOS”, IEEE International Solid-State Circuits Conference, ISSCC Deg. Tech. Papers, pp. 480-481, and p. 667, (2006).
Hirata et al.; A New FIR Switched-Capacitor Circuit for High Frequencies with Low-Power Consumption (Parallel Cyclic Type Circuit)., Shingakuron (A), vol. J75-A, No. 1, pp. 27-38, (1992).
Muhammad et al.; “Direct RF Sampling Mixer with Recursive Filtering in Charge Domain”, IEEE, Proceedings of the International Symposium on Circuits and Systems (ISCAS '04), vol. 1, pp. I-577 to I-580, (2004).

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