| 摘要 |
<p>A circuit provides a constant load-independent d.c. with a feedback amplifier. The d.c. is suitable for supply to a remote measurement resistance so as to enable measurement of a temp. dependent voltage. The circuit enables the operational amplifier and the measurement circuit to be supplied from a single stabilised source. Simple linearisation of the thermal resistance characteristic is also facilitated. The measurement resistance (hm) is connected between the negative supply and the negative supply amplifier (V1) connection. An operating voltage (UB) provides the supply current to the amplifier and determines its working point via resistors (R4, R6), and provides its output current (12) via a load resistor (R2) and a feedback resistor (R1).</p> |
