| 摘要 |
PURPOSE:To obtain an oscillator suitably applicable to the oscillating circuit of a local oscillator employing the electronic tuning system by improving the stability of the operation of a diffential amplifier via a level shifing circit of an emitter and by sharing one of two tuning-circuit fitting terminals with another purpose. CONSTITUTION:The differential amplifier composed of transistor TRs 1 and 2 constitutes a positive feedback loop. Then, loops are formed from the collector of TR1 to the base of TR2 via feedback resistance 6 and the level shifting circuit of the emitter follower consisting of TR14 and resistance 16, and similarly from the collector of TR2 to the base of TR1 via feedback resistance 7 and the level shifting circuit of the emitter follower, improving the stability of the operation of the differential amplifier. Further, one of two tuning-circuit fitting terminals is shared with another purpose to make the titled oscillator suitable for the oscillating circuit of a local oscillator employing the electronic tuning system. |
