Patent ID: 8200178
Filing Date: 2012-06-12
Classification: G01R

Abstract:
1. A method for obtaining field strength information from a received electromagnetic signal via a receiver unit, the method comprising: generating an input voltage for an operational amplifier from the received signal in the receiver unit via an input resistance configured as a voltage divider circuit; generating an output voltage by the operational amplifier via a fixed amplification factor; changing the input voltage until the output voltage is within a predefined interval that includes a value of a reference voltage; tapping the input voltage at the voltage divider circuit; selecting a divider node and tapping a partial voltage to change the input voltage at the voltage divider circuit, which has a plurality of divider nodes and a constant resistance value; assigning each divider node a predefined value of a first variable; and determining the field strength value received by the receiver unit based on a comparison of the predefined value assigned to the selected divider node of the first variable with a field strength value assigned to a value of a first variable in a value table.