Amplifiers – Combined with automatic amplifier disabling switch means
Patent
1999-03-26
2000-07-18
Pascal, Robert
Amplifiers
Combined with automatic amplifier disabling switch means
330 9, 327124, H03F 114
Patent
active
060912936
ABSTRACT:
An amplifier circuit having a reset capability for use in analog-to-digital converter comparator stages and the like. First and second amplifier stages include first and transistor second switches, respectively, which are coupled between the amplifier inputs and outputs. A capacitor is coupled intermediate the output of the first amplifier stage and the input of the second amplifier stage. A third transistor switch is coupled between the output of the second amplifier stage and the output of the first amplifier stage. In an initialize state, a switch controller operates to render the first and second switches conductive and the third switch non-conductive. In a typical application, this will cause a charge to be stored on the capacitor indicative of any offset between the virtual grounds of the amplifier stages. In a reset state, the third switch is conductive and the first and second switches are made non-conductive. This causes the input and output of the second amplifier stage output to rapidly move from a potentially saturated state to an equilibrium state so that the second stage will be in condition for the next state, the amplify state. All three switches are non-conductive in the amplify state so that the amplifiers are, by way of example, either operating open loop or with some feedback impedance which provides a gain greater than unity.
REFERENCES:
patent: 4210872 (1980-07-01), Gregorian
patent: 4438354 (1984-03-01), Haque et al.
patent: 5084639 (1992-01-01), Ribner
patent: 5880630 (1999-03-01), Iwamoto et al.
Choe Henry
National Semiconductor Corporation
Pascal Robert
LandOfFree
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