reference voltage source造句

For AC circuits, the principle is extended with a polarizing winding connected to a reference voltage source.
They measure voltage by means of " voltage balancing ", in which the input voltage is compared with an internal reference voltage source using an electronic circuit with a very high input impedance ( of the order of 10 14 ohms ).
The base voltage of the right transistor T3 is held fixed by a reference voltage source, shaded light green : the voltage divider with a diode thermal compensation ( R1, R2, D1 and D2 ) and sometimes a buffering emitter follower ( not shown on the picture ); thus the emitter voltages are kept relatively steady.
It's difficult to find reference voltage source in a sentence. 用reference voltage source造句挺难的