Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2006-11-14
2006-11-14
Nghiem, Michael (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
Reexamination Certificate
active
07136764
ABSTRACT:
A variable gain amplifier circuit1includes an amplifier A1, an amplifier A2, an inductor L1, and an inductor L2. The amplifier A1has a predetermined gain and is connected at a terminal to a circuit output section. The amplifier A2has a different gain from the amplifier A1and is connected at a terminal to the circuit output section. The inductor L1is connected at an end to a circuit input section and at the other end to the input terminal of the amplifier A1. The inductor L2is connected at an end to ground and at the other end to the input terminal of the amplifier A2. The inductors L1and L2form a transformer T. The configuration restricts input impedance variations which are dependent on the signal path taken by an input signal Vin. The input impedance and the signal source impedance remain matched. Impedance matching is preformed with the signal source with variable gain.
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Nghiem Michael
Sharp Kabushiki Kaisha
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