| 摘要 |
Amplifier circuitry (10) includes a driver amplifier (11) and an integrator amplifier (AH) producing an output signal (VAH) that controls a pass transistor (Q2) coupled to a pump capacitor (CH). Input circuitry (16) controls the direction of ramping of the output signal during a first interval to boost a supply voltage (V12) of the driver amplifier via the pump capacitor, and also controls the direction of ramping to recharge the pump capacitor following a second interval. In one embodiment, pump capacitor recharging circuitry (Q75,R76,ICCH) completes the recharging of the pump capacitor following the second interval after it has been partially recharged by the integrator amplifier. |
