Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-07-13
2000-02-22
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330254, H03F 345
Patent
active
060284781
ABSTRACT:
A voltage converting multiplier circuit converts a single ended input voltage V.sub.gain into a differential output voltage V.sub.DO, and includes a differential input cell and a differential output cell, each biased by a respective control current. A control circuit includes an input device having a resistance R.sub.in coupled to an input terminal, and a differential amplifier which controls the differential input cell to maintain a voltage at one end of the input device equal to a reference voltage V.sub.REF, so as to convert the input voltage into an input current dI equal to (V.sub.REF -V.sub.in)/R.sub.1. A current mirror ensures that the input current is supplied by the branches of the differential input cell, which current splitting is mirrored to the differential output cell. An output device having a resistance R.sub.out in each branch of the differential output cell converts the differential output current to the differential output voltage V.sub.DO, where V.sub.DO =V.sub.in (R.sub.out /R.sub.in) (I.sub.cout /I.sub.cin) where I.sub.cout and I.sub.cin are the control currents applied to the differential input and output cells, respectively. A temperature compensated voltage is achieved where I.sub.cin is a constant current and I.sub.cout is a temperature compensated current. A temperature compensated variable gain amplifier including the converter circuit is also disclosed.
REFERENCES:
patent: 4516081 (1985-05-01), Katakura
patent: 4878031 (1989-10-01), Main
patent: 5302868 (1994-04-01), Fergus
patent: 5532644 (1996-07-01), Nakagawara
patent: 5606272 (1997-02-01), Behbahani et al.
"Current-Mode Circuits From A Translinear Viewpoint: A Tutorial", by Barrie Gilber, Chapter 2, Peter Peregrinus Ltd (UK 1990).
Eschauzier Rudolphe Gustave
Seremeta Dorin
Choe Henry
Pascal Robert
Philips Electronics North America Corporation
Wieghaus Brian J.
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