Bias generator providing process and temperature invariant MOSFE

Details Bias generator providing process and temperature invariant MOSFE Bias generator providing process and temperature invariant MOSFE

1996-08-19

1998-05-05

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

327543, H03K 3011

Patent

active

057480303

ABSTRACT:
The present invention describes a bias generator (10) which supplies a temperature stabilizing bias current (72) to a main circuit (90). The bias generator (10) comprises a measurement unit (20) having a similar structure and temperature characteristic as the main circuit (90). Measurement unit (20) supplies a temperature dependent measurement signal (27). A temperature invariant element (40) supplies a temperature independent reference signal (47). These signals (27, 47) are compared in a differential amplifier (30) which controls variable current sources (50, 60, 70). The variable current sources (50, 60) supply the measurement unit (20), the temperature invariant element (40) and the bias current (72) for the main circuit (90) itself. A negative feedback is produced which results in a stabilized transconductance of the main circuit (90). Therefore, the bias current (72) which determines all other currents and the speed of the main circuit (90) is automatically adjusted to the needs. Power consumption can be reduced and the reliability of the main circuit (90) can be improved.

REFERENCES:
patent: 4723108 (1988-02-01), Murphy et al.
patent: 5103158 (1992-04-01), Cho et al.
patent: 5124631 (1992-06-01), Terashima
patent: 5220273 (1993-06-01), Mao
patent: 5359552 (1994-10-01), Dhong et al.
patent: 5394026 (1995-02-01), Yu et al.
patent: 5467052 (1995-11-01), Tsukada

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