Amplifiers – With semiconductor amplifying device – Including balanced to unbalanced circuits and vice versa
Reexamination Certificate
2005-06-21
2005-06-21
Nguyen, Khanh V. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including balanced to unbalanced circuits and vice versa
C330S252000
Reexamination Certificate
active
06909328
ABSTRACT:
A device converts a differential signal (Vin1, Vin2) to a single signal (Vout). The device includes at least one pair of transistors (Q1, Q2) having equal transconductance gain (gm) and arranged according a differential stage configuration. The transistors (Q1, Q2) have the differential signal (Vin1, Vin2) in input at the drivable terminals, have first non drivable terminals coupled respectively to first terminals of a first (R1) and a second (Rout) passive elements having second terminals connected with a first supply voltage (VDD), second non drivable terminals coupled to a second supply voltage (VEE) lower than the first supply voltage (VDD). The first terminal of the second passive element (Rout) is the output terminal (OUT) of the device. The last includes a transistor (Q3) having a first non drivable terminal connected with the output terminal (OUT) of the device, a second non drivable terminal coupled with the second supply voltage (VEE) and the drivable terminal connected with the first terminal of the first passive element (R1). The further transistor (Q3) has such a transconductance gain (gm3) that the product of the transconductance gain (gm3) by the first passive element (R1) is unitary.
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T.D. Towers, “Balanced Transistor D.C. Amplifiers: How Modern Diffused Silicon Transistors and F.E. Ts Are Used To Amplify D.C. Low-Level Currents and Voltages”, Wireless World, IPC Business Press Ltd., vol. 74, No. 1394, Aug. 1968, pp. 269-274, XP001127064.
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Calí Giovanni
Pelleriti Roberto
Torrisi Felice
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Gutman Jose
Jorgenson Lisa K.
Nguyen Khanh V.
STMicroelectronics S.r.l.
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