Amplifier circuit
An amplifier circuit includes a bias control feedback loop. A sensing transistor (108) is matched to one or more power transistors (101a, 101b, 101c) and is correspondingly biased. The difference between collector voltage of the sensing transistor (108) and a reference voltage amplified by a differe...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | An amplifier circuit includes a bias control feedback loop. A sensing transistor (108) is matched to one or more power transistors (101a, 101b, 101c) and is correspondingly biased. The difference between collector voltage of the sensing transistor (108) and a reference voltage amplified by a differential amplifier (111, 114) to provide the base bias voltage for the power transistors (101a, 101b, 101c) and the sensing transistor (105). The gain of the amplifier is controlled by applying a control voltage to a resistor (110) connected to the collector of the sensing transistor (105). |
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