Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1997-12-10
1999-08-10
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including gain control means
330282, H03G 310
Patent
active
059364700
ABSTRACT:
An audio amplifier having an improved bi-polar transistor variable impedance circuit which is inexpensive to implement and which exhibits improved linearity. The resistance characteristic of the circuit is linearized with respect to the input signal strength through the addition of a diode between the control voltage and the base of the bi-polar transistor. This simple and inexpensive combination significantly improves the resistance linearity, allowing the transistor to handle significantly higher input signal voltages without increasing the output signal distortion. Additionally, the linearity of the control voltage response is improved through the addition of a second transistor-diode combination connected in current-mirroring relationship to the variable impedance transistor-diode combination. This circuit is particularly useful in applications requiring a wide-range open-loop control, such as a volume or tone control.
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Choe Henry
Delco Electronics Corporation
Funke Jimmy L.
Pascal Robert
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