Level conversion circuit

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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307446, 307475, 307296R, H03K 19092

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active

043663974

ABSTRACT:
The collectors of differential pair transistors having their emitters connected to each other are connected to a positive power source voltage via respective load resistors. The emitters are connected to a negative power source voltage via a current source transistor.
The base bias voltage of the current source transistor is supplied from a bias circuit operating on the difference voltage between the positive power source voltage and the negative power source voltage.
When the positive power source voltage drops, the base bias voltage of the current source transistor drops in response thereto. Hence, the value of a current flowing through the current source transistor decreases. Due to this decrease of the current, the voltage drop of the load resistors decreases, thereby off-setting a low level potential of the collector output signals of the differential pair transistors.
Thus, the differential pair transistors are prevented from being driven into saturation.

REFERENCES:
patent: 3590274 (1971-06-01), Marley
patent: 3766406 (1973-10-01), Bryant et al.
patent: 4249091 (1981-02-01), Yamagiwa
J. C. Froment et al., "ECL to TTL Translator Driver", IBM Technical Disclosure Bulletin, vol. 21, No. 10, Mar. 1979, pp. 4074-4075.
Patents Abstracts of Japan, vol. 2, No. 104, 26.08.78, p. 5430e78.

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