Low-pass filter and voltage-current conversion circuit used...

Details Low-pass filter and voltage-current conversion circuit used... Low-pass filter and voltage-current conversion circuit used...

2007-04-25

2008-12-16

Zweizig, Jeffrey S (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S103000

Reexamination Certificate

active

07466192

ABSTRACT:
A low-pass filter with a high signal-to-noise ratio is provided. A low-pass filter includes a first RC filter circuit, a differential operation circuit subtracting an output signal from a low frequency component of an input signal and outputting a differential signal, a second RC filter circuit, a voltage-current conversion circuit, and a capacitor. The voltage-current conversion circuit includes an operational amplifier, a first resistor, and a feedback circuit generating a feedback voltage in accordance with a voltage applied to the first resistor. If resistance values of first to fourth resistors are R1, R2, R3, R4, a relational expression of R1*R3=R2*R4is satisfied, and output current i becomes constant regardless of a resistance value of a load resistance. Since only a first resistor is connected between the input and the output of the voltage-current conversion circuit, thermal noise decreases, and a signal-to-noise ratio becomes high.

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patent: 2000-269752 (2000-09-01), None
patent: 2003-283299 (2003-10-01), None
patent: 2005-051854 (2005-02-01), None

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