Control circuit with both positive and negative sensing

Details Control circuit with both positive and negative sensing Control circuit with both positive and negative sensing

1998-02-06

2000-06-27

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 63, 327 66, H03K 508, H03L 500

Patent

active

060811404

ABSTRACT:
A control circuit is provided which includes a single programmable terminal for controlling a plurality of modes, functions or parameters in a programmable circuit with a minimum of program elements connected to the single programmable terminal. The program elements may illustratively be resistors, capacitors, inductors or other circuit components. In a first mode, for example, two program elements control a signal generating function in the programmable circuit. In a second mode in this example, a voltage provided internally forces a condition at the programmable terminal to control another signal generating function. In both first and second modes, the values of the program elements, selectable by the user, also determine the particular frequencies of the respective generated signals. In a third mode, the signals generated in the first and second modes are compared to provide yet another a control function. There is further provided an absolute value comparator responsive to either polarity of an input sense signal applied to a single sense terminal. A switched output results when the input exceeds a temperature compensated systematic offset inherent to the comparator without requiring external threshold signals.

REFERENCES:
patent: 4899064 (1990-02-01), Neidorff
patent: 5068620 (1991-11-01), Botti et al.
patent: 5298809 (1994-03-01), Yamaguchi
patent: 5606272 (1997-02-01), Behbahani et al.
patent: 5699010 (1997-12-01), Hatanaka
patent: 5910736 (1999-06-01), Nagata et al.

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