Sensor interface circuitry having adjustable gain and Q, and...

Amplifiers – With semiconductor amplifying device – Including gain control means

Reexamination Certificate

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C330S086000

Reexamination Certificate

active

07414476

ABSTRACT:
A sensor interface filter having adjustable gain and Q is provided. The sensor interface includes a first operational amplifier coupled to gain circuitry, a gain stage, and a resistor. The gain circuitry and gain stage are electrically coupled to each other. The gain stage includes a gain stage switch, and is coupled to control circuitry. The control circuitry controls the state of the gain stage switch to vary the number of feedback current paths providing feedback to the inverting input of the first operational amplifier, altering the gain provided by the first operational amplifier. The sensor interface further includes a second operational amplifier coupled to filter circuitry and feedback switches. The feedback switches are coupled to the control circuitry, which controls the state of the feedback switches to vary the gain provided by the second operational amplifier and the filter Q of the sensor interface. A method is also provided.

REFERENCES:
patent: 7068107 (2006-06-01), Wang et al.
patent: 7161419 (2007-01-01), Tei et al.

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