Bootstrap Capacitor Audio Amplifier

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Bootstrap Amplifier Circuit using Transistors

https://circuitdigest.com/electronic-circuits/bootstrap-amplifier-circuit-using-transistors

Bootstrap capacitor is used to provide AC signal’s positive feedback to the base of the transistor. This positive feedback help in improving the effective value of the base resistance. This increment in the base resistance also determined by the voltage gain of the amplifier circuit. Why do we need High Input Impedance for Amplifier Transistor?

US5315263A - Push-pull amplifier having bootstrap ...

https://patents.google.com/patent/US5315263A/en

An audio power amplifier includes a stacked pair of complementary transistors having the emitters commonly coupled to a load. A driver stage couples the …

Push-pull amplifier having bootstrap capacitor isolation ...

https://www.mysciencework.com/patent/show/pushpull-amplifier-having-bootstrap-capacitor-isolation-US5315263A

An audio power amplifier includes a stacked pair of complementary transistors having the emitters commonly coupled to a load. A driver stage couples the bases of the stacked pair to a source of audio frequency signal. A bootstrap capacitor is coupled between the commonly coupled output node and the supply voltage.

TPA31xxDx Bootstrap Circuit Application Report

https://www.ti.com/lit/an/sloa259/sloa259.pdf

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Passive Component Selection Guide for Class-D …

https://www.ti.com/lit/pdf/slaa903

Bootstrap capacitor The bootstrap capacitor needs to be connected between the bootstrap pin and respective Class-D output pin. Applicable for non-boosted audio amplifiers. Charge pump capacitor Connect on high-side gate CP regulator output with respect to power stage supply. Applicable for boosted audio amplifiers. Boost inductor

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