Double sampling analog low pass filter

Details Double sampling analog low pass filter Double sampling analog low pass filter

1998-06-29

2000-08-22

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, 327558, 330 9, H03K 500

Patent

active

061078719

ABSTRACT:
A double sampling analog low pass filter for converting differential inputs of first and second analog signals into a single-ended output signal. The double sampling analog low pass filter having first and second input terminals and a final output terminal includes a first charging/discharging means including at lest one charge storing means, and for charging and/or discharging the charge storing means in response to at least one control signal on receiving a first analog input signal from the first input terminal and a second charging/discharging means including at least one charge storing means, and for charging and/or discharging the charge storing means in response to at least one control signal on receiving a second analog input signal from the second input terminal. A differential input single-ended output operational amplifier amplifies the difference between outputs from the first and second charging/discharging means. A gain control and pole generating means controls a gain of the differential input single-ended output operational amplifier and generates a pole of a transfer function of the differential input single-ended output operational amplifier.

REFERENCES:
patent: 5218448 (1993-06-01), Honjo et al.
patent: 5341050 (1994-08-01), Mellissinos et al.
Ismail et al., "New Fully-Integrated Mosfet-Capacitor Active Filters", Jun. 1985, pp. 1435-1438.
Millman et al., "Microelectronics", 1988, McGraw-Hill, pp. 751-752.

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