| 摘要 |
<p>A current and temperature compensated voltage reference circuit operates from a power supply voltage as low as approximately 1.3 Volts. A current reference circuit uses a folded-cascode amplifier to measure the temperature dependent voltages provided by first and second bias circuits, each of which includes two series-coupled diodes or diode-connected bipolar junction transistors (BJTs), and provides a proportional to absolute temperature (PTAT) current in response thereto. A voltage reference circuit uses a PTAT current through a resistor to create a PTAT voltage in series with a diode-voltage, and the resistor value is adjusted until the sum of these voltages is approximately equal to the bandgap voltage of silicon, thereby providing a temperature compensated voltage reference. The reference circuit is suitable for use with an implantable cardiac rythm management system having a battery that provides a power supply voltage approximately between 1.3 Volts and 3.25 Volts.</p> |
