Class "B" type amplifier
AssigneeSignetics Corporation
InventorWerner H. Hoeft
Life of this patent
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Abstract
A Class "B" amplifier circuit in which Class "B" conversion takes place in a converter portion of the circuit in combination with a differential amplifier input circuit, rather than in the output stage. The converter modulates the DC bias current supplied to the differential amplifier input circuit as a function of the input signal, in order to achieve Class "B" operation. The output amplifier portion of the circuit includes a pair of complementary, series-connected transistors, each of which is connected in a common-emitter configuration. The disclosed circuit provides a high input impedance and excellent dynamic range.
Claims6
A Class "B" type amplifier circuit, which comprises:
- differential amplifier input circuit means having a single-ended signal input terminal, a current bias terminal and first and second differential output terminals;
- Class "B" converter circuit means having an input terminal for receiving a DC bias input current, an AC current summing node, a converter output terminal and a common terminal, said converter output terminal being connected to the current bias terminal of said differential amplifier to provide a modulated DC bias signal thereto, and said first and second differential output terminals being operatively coupled to said current summing node;
- and
- output amplifier circuit means having first and second input terminals operatively coupled to said first and second differential output terminals, respectively, and a single-ended output terminal for providing an amplified output signal with respect to said common terminal.
Dependencies are inferred from the claim text.