Oscillators – Solid state active element oscillator – Transistors
Patent
1986-09-24
1988-01-05
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331176, 332 14, H03K 3283
Patent
active
047178922
ABSTRACT:
An emitter-coupled astable multivibrator capable of reducing a temperature drift of an oscillation frequency to zero is disclosed. The multivibrator includes first and second transistors, the emitters and collectors of which are cross-coupled, and which are turned ON and OFF at given intervals in accordance with the control current; a capacitor, connected between the emitters of the first and second transistors, to be charged and discharged, the charging polarity of the capacitor being alternately inverted upon the turning ON/OFF of the first and second transistors; third and fourth transistors, the bases of which are commonly connected to a power source circuit, and the emitters of which are respectively connected to the collectors of the first and second transistors; and a fifth transistor, the base of which is connected to the power source circuit to have a predetermined potential difference from the base potentials of the third and fourth transistors, and the emitter of which is connected to the collectors of the first and second transistors through first and second resistors, respectively. The emitter current density of the fifth transistor is different from that of the third or fourth transistor to compensate for the temperature drift.
REFERENCES:
patent: 4007426 (1977-02-01), Utsunomiya
patent: 4492914 (1985-01-01), Hitomi
patent: 4600897 (1986-07-01), Koga et al.
Grimm Siegfried H.
Kabushiki Kaisha Toshiba
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