Amplifier for controlling linear gain of wide band using externa

Details Amplifier for controlling linear gain of wide band using externa Amplifier for controlling linear gain of wide band using externa

1992-03-30

1993-10-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330311, H03F 345, H03G 300

Patent

active

052569845

ABSTRACT:
An amplifier for controlling the linear gain of wide band using an external bias voltage is disclosed to maintain the gain characteristics stably even for the high frequency input signals by adjusting the external bias voltage to prevent the amplified gain from being distorted or the gain from being decreased when increasing the linearity, where in a first fine voltage is generated with the inverse hyperbolic tangent function of the external bias voltage for adjusting the gain, a first voltage is generated with the hyperbolic tangent function of the first fine voltage and linearly proportional to the external bias voltage, a second fine voltage is generated with the inverse hyperbolic tangent function of the input signal voltage, a second voltage is generated with the hyperbolic tangent function of the second fine voltage for adjusting the first voltage, and the second voltage is converted to the linearly corresponding output signal voltage, thereby amplifying the gain even for the high frequency input signals, without any distortion.

REFERENCES:
Liu, "Differential Variable-Gain Amplifier", IBM Technical Disclosure Bulletin, vol. 15, No. 5, Oct. 1972, pp. 1444-1445.
Holt, Charles, Electronic Circuits: Digital and Analog, John Wiley & Sons, 1978, pp. 608-615.
Horowitz and Hill, The Art of Electronics, Cambridge University Press, 1981, pp. 554-563.

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