Emitter-coupled multivibrator circuit independent of temperature

Details Emitter-coupled multivibrator circuit independent of temperature Emitter-coupled multivibrator circuit independent of temperature

1990-07-17

1991-10-29

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331144, H03K 3283

Patent

active

050619080

ABSTRACT:
An emitter-coupled multivibrator circuit independent of temperature and supply voltage includes an oscillator circuit (11), a current control circuit (12) and a supply voltage circuit (13) for producing at least one reference voltage. The oscillator circuit consists of two switching transistors (15,16), each with a collector coupled to a respective collector-emitter branch of two interception transistors (37,38) for a lower threshold voltage and of two interception transistors (35,36) for a higher threshold voltage and, to respective active loads (28,29) of the current control circuit (12). The loads (28,29) are associated with a current mirror branch (31) including transistors (30,34) and a current source (32,33). The bases of the interception transistors (37,38) are connected to a reference voltage U.sub.b2 and those of the interception transistors (35,36) are connected to the emitter of the transistor (34). The emitter surface of the transistor (30) exceeds by a factor P that of one of the interception transistors (35 and 36) and that of the transistor (34) exceeds by a factor N that of one of the interception transistors (37 and 38). The product of the factors N and P is constant. The voltage supply circuit insures that the oscillation frequency f is independent of the supply voltage.

REFERENCES:
patent: 3582809 (1971-06-01), Rigby
patent: 3904989 (1975-09-01), Cordell
patent: 4717892 (1988-01-01), Hitomi
patent: 4803445 (1989-02-01), Yamasaki

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