Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1975-11-17
1977-05-24
Mullins, James B.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330 22, 330 25, 330 28, H03F 134
Patent
active
040258700
ABSTRACT:
The disclosed amplifier circuit includes a common base transistor, a turn-around device and a driver transistor, which is connected to a filter. An emitter follower stage is also connected to the filter. The turn-around device is connected between the common base and driver transistors. A diode connected transistor is utilized for compensating for the nonlinearity of the common base transistor. A first negative feedback path is provided between the driver and common base transistors to stabilize bias levels, increase amplifier output impedance and reduce distortion. A frequency compensation capacitor is connected to the driver transistor and a second negative feedback path is provided from the output of the emitter follower stage to the driver transistor. The second negative feedback path facilitates rapid discharge of the capacitor and driver transistor, a high slew rate and compensates for the nonlinearity of the emitter follower.
REFERENCES:
patent: 3460048 (1969-08-01), Fichtner
patent: 3800239 (1974-03-01), Callahan
patent: 3914704 (1975-10-01), Craft
Ahmed, "Zero-Offset Potential Follower Circuits," RCA Technical Notes, Tn No. 938, Oct. 2, 1973.
Jones, Jr. Maurice J.
Motorola Inc.
Mullins James B.
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