Filter circuit and electronic apparatus

Details Filter circuit and electronic apparatus Filter circuit and electronic apparatus

1996-06-18

1998-04-21

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327563, 330306, 365 65, H03K 500

Patent

active

057421994

ABSTRACT:
A filter circuit and an electronic apparatus using the filter circuit in which the manufacturing process can be simplified and the circuit is reduced in its size, and the minimum operating voltage is increasingly lowered and dynamic range is expanded comparing to that of prior art. A capacitor C taking out a signal component in a predetermined band from both ends is connected in series to a first diode, which is constantly in a conducting state by a second current source for diode, of a first differential pair to which the input signal of one differential input signal is supplied, and a second diode, which is constantly in a conducting state by a fourth current source for diode, of a second differential pair to which the other input signal is supplied.

REFERENCES:
patent: 4914401 (1990-04-01), Mader
patent: 5327302 (1994-07-01), Khoury et al.

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