| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an offset adjusting circuit in comprementary type differential amplifier circuits having only one adjusting position and allowed to be easily adjusted. SOLUTION: So-called comprementary type differential amplifier circuits 1, 2 are formed mainly by two npn transistors(TRs) 5, 6 and two pnp TRs 18, 19 and a constant current circuit 10 in the 1st differential amplifier circuit 1 consists of a so-called current mirror circuit mainly constituted of 5th and 6th TRs 11, 12. Both the end parts of an adjusting variable resistor 16 are connected between a node of emitter resistors 13a, 13b and a node of emitter resistors 14a, 14b and a sliding contact 16a is connected to negative power supply voltage -V. The level of a constant current 12 can be adjusted by adjusting the resistor 16, so that the offset adjustment of an output signal can be attained only by one position.</p> |
