Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-12-31
1994-05-31
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
053172795
ABSTRACT:
A voltage to current converter includes three field effect transistors (FETs), the sources of which are electrically connected to define a common source node, and a feedback network. First and second voltage inputs are connected to the gates of the first and second FETs, respectively. First and second current outputs are connected to the drains of the first and second FETs, respectively. The feedback network is connected between the drain of the third FET and the common source node. The feedback network controls and extends linearity by varying the voltage between the common source node and ground in response to changes in the voltage inputs in order to maintain a constant current through the third FET. The floating common source node quickly adjusts and thereby keeps a linear relationship between the input voltages and the output currents. Thus, the feedback network can dynamically bias the converter by permitting the common source node to float with respect to ground.
REFERENCES:
patent: 4580106 (1986-04-01), Vittoz
patent: 5146179 (1992-09-01), Carley et al.
High Frequency CMOS Transconductors, Analogue IC Design: The Current-Mode Approach, (Chp. 5), Dupuie and Ismail, edited by Ioumazou, Lidgey & Haigh, 1990 (Peter Peregrinus Ltd.).
Integrated Circuits and Microprocessors, Electronics Engineers' Handbook, (3d Ed.) edited by Fink and Christiansen, pp. 8-64-8-66; Operational Amplifiers for Analog Arithmetic, Hesler, pp. 13-96-13-99, 1989, McGraw-Hill, Inc.
Electronics Engineers' Handbook, (3d Ed.) edited by Fink and Christiansen, "Integrated Circuits and Microprocessors", pp. 8-64-8-66; "Operational Amplifiers for Analog Arithmetic", by Hesler, pp. 13-96-13-99, 1989.
Babanezhad and Temes, "A 20-V Four-Quadrant CMOS Analog Multiplier", IEEE Journal of Solid State Circuits, vol. SC-20, No. 6, pp. 1158-1167, Dec., 1985.
Torrance, Viswanathan, and Hanson, "CMOS Voltage to Current Transducers", IEEE Transactions on Circuits and Systems, vol. CAS-32, No. 11, pp. 1097-1104, Nov., 1985.
Ismail Mohammed
Zarabadi Seyed R.
Dudek J.
Mullins James B.
Ohio State University
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