Amplifiers – With semiconductor amplifying device – Including signal feedback means
Patent
1992-05-26
1993-11-23
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including signal feedback means
330 85, H03F 134
Patent
active
052648060
ABSTRACT:
A bipolar transistor is used as an active feedback inductor to emulate the frequency dependant impedance characteristics of a spiral inductor at microwave frequencies using active techniques. The active feedback is biased by several resistors. By substituting active feedback for a conventional spiral inductor, the chip layout can be reduced by as much as 50%. The bandwidth of the device can be controlled by choosing appropriate tuning resistor values to bias the active feedback inductor when fabricating the chip. By changing the value of these tuning resistors the inductance created can be directly controlled, which in turn affects the frequency response of the device.
REFERENCES:
patent: 3571625 (1971-03-01), Braun
patent: 3624532 (1971-11-01), Seidel
patent: 4236119 (1980-11-01), Battjes
patent: 4774478 (1988-09-01), Taylor
patent: 4792987 (1988-12-01), Tumeo
patent: 5166639 (1992-11-01), Green et al.
John Chroma, "Simplified Design Guidlines for Dominant Pole Amplfiers Peaked Actively by Emitter or Source Followers" IEEE Transactions on Circuits and Systems, vol. 36, No. 7, Jul. 1989.
Mottola Steven
Taylor Ronald L.
TRW Inc.
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