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A transistor buffered voltage-mode amplifier is disclosed. This amplifier operates well when high output load current, at close to rail voltages, is required.
English (United States)
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A transistor buffered voltage-mode amplifier is disclosed. This amplifier
operates well when high output load current, at close to rail voltages, is required.
When the output voltage of operational amplifier 10 approaches the rail
voltage of #12 volts, the current through the operative one of the bias resistors 11
and 12 decreases to the point where the base current of the operative one of the
transistors 13 and 14 is equal to that of its bias resistor curr Output current 15 is
then limited by the transistor's base current times the gain of the transistor.
Bootstrap capacitor 16 operates when more base current is required than the
base biasing resistor can supply. Operational amplifier 10 then supplies
additional base current via the bootstrap capacitor. The circuit works especially
well when current pulses at high voltages are required (i.e., current pulses to an
inductive load such as an actuator or voice coil).
This circuit increases both voltage and peak pulsed current outputs, requires
a minimum of additional circuitry, and eliminates the need for additional gain