Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1995-09-28
1997-06-24
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327544, H03K 5153, G05F 110
Patent
active
056420633
ABSTRACT:
The invention relates to a method and a comparison circuit for the detection of an input signal level exceeding a threshold value in an accurate and current-saving manner. The comparison is done in two phases: the circuit has a transistor switch (4) for the coarse comparison and a comparator (1) for the accurate comparison. The output (PWD) of the switch (4) switches the comparator (1) and the accurate reference voltage (VREF2) generator on when the input voltage (VIN) exceeds the threshold level (VREF1) of the switch (4). The comparator (1) switches the output voltage (VOUT) on when the input voltage (VIN) exceeds the accurate reference voltage (VREF2). The inventive comparison circuit is used e.g. in mobile telephones.
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Nokia Mobile Phones Ltd.
Tran Toan
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