| 摘要 |
A regulated power supply circuit includes a voltage reference circuit arranged to generate a reference voltage and an output device responsive to a control signal to supply a load from a voltage source. A control circuit is arranged to compare an output voltage at the load with the reference voltage. The control circuit includes a comparator comprising a long-tailed transistor pair having a first input to which the reference voltage is applied, a second input to which the output voltage is applied, and an output connected to an input terminal of the output device. The control circuit applies a correction signal to the output device via a single semiconductor junction to regulate the output voltage, thereby minimising propagation delay in the control circuit. The circuit may include a primary voltage regulator arranged to supply the control circuit at a lower voltage than that of the voltage source. |
