Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1989-10-06
1991-04-09
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330254, 330257, H03F 345
Patent
active
050068156
ABSTRACT:
A linear-gain amplifier arrangement comprises a current amplifying cell consisting of field-effect transistors and comprising a first (M1, M3) and a second (M2, M4current-mirror circuit whose respective input transistors (M1; M2) and output transistors (M3; M4) constitute a first and a second differential pair. The input transistors (M1; M2) have their drain electrodes connected to voltage-current converter (V/I) made up of field-effect transistors. The V/I converter supplies difference currents (I.sub.in1 ; I.sub.in2) which are square-law functions of the input voltage (U.sub.in) to be amplified. The difference between these input currents is a linear function of the input voltage. When the transistors are operated in their saturation regions the difference between the output currents (I.sub.out1 ; I.sub.out2) is also a linear function of the input voltage (U.sub.in). By adding a direct voltage (V.sub.c) to the gate-source voltage of the input and output transistors or by adding a direct current (I.sub.c) to the respective input currents (I.sub.in1 ; I.sub.in2) the gain can be varied without a change in bandwidth. When the arrangement is constructed as an integrated semiconductor circuit its gain can be made immune to temperature variations and tolerances in the fabrication process.
REFERENCES:
patent: 3790897 (1974-02-01), Wheatley
patent: 4459555 (1984-07-01), Jett, Jr.
Gilbert, "A New Wide-Band Amplifier Technique", IEEE Journal of Solid-State Circuits, vol. SC-3, No. 4, Dec. 1968, pp. 353-365.
Seevinck, "A Versatile CMOS Linear Transconductor/Square-Law Function Circuit," IEEE Journal of Solid-State Circuits, vol. SC-22, No. 3, Jun. 1967, pp. 366-377.
Klumperink Eric A. M.
Seevinck Evert
Franzblau Bernard
Mullins James B.
U.S. Philips Corporation
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