Amplifiers – With semiconductor amplifying device – Including temperature compensation means
Patent
1998-12-14
2000-09-05
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including temperature compensation means
330133, H03F 130
Patent
active
061149101
ABSTRACT:
An amplifier having an uncompensated gain which decreases with increasing temperature. The amplifier includes an integrated circuit chip having formed thereon a plurality of serially coupled amplifier stages. Each one of a portion of such stages has temperature compensation circuitry. Such circuitry includes a plurality of selectable gains, such gain being selected in accordance with temperature of the chip. The stage has a higher gain at a temperature above a predetermined threshold level associated with such stage and a lower gain at temperature below such predetermined threshold level associated with such stage. Each one of such stages is associated with a different predetermined threshold level. Each one of the stages includes a gain stage having a switchable feedback element, such stage providing a first gain when such element is switched into one state and a second gain when such element is switched into a second state. The temperature compensation circuitry switches such element into one of the states selectively in accordance with the temperature of the chip. Each one of the stages includes a gain stage having: a feedback element; and a switch, such element being in shunt with the switch. The switch is operable to either shunt such element or un-shunt such element. The stage provides a first gain when such element is shunted by the switch and a second gain when such element is un-shunted by such switch. The temperature compensation circuitry places such switch is a condition to either shunt such element or un-shunt such element selectively in accordance with the temperature of the chip.
REFERENCES:
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patent: 5099204 (1992-03-01), Wheatley, III
patent: 5159288 (1992-10-01), Ito
patent: 5216384 (1993-06-01), Vanhecke
patent: 5268601 (1993-12-01), Cossins
patent: 5576662 (1996-11-01), Price et al.
Nguyen Khanh Van
Pascal Robert
Raytheon Company
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