Method and circuit for obtaining field strength information

Details Method and circuit for obtaining field strength information Method and circuit for obtaining field strength information

2005-07-26

2005-07-26

Vo, Nguyen T. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

Reexamination Certificate

active

06922553

ABSTRACT:
A receiving unit including an operational amplifier having a fixed gain receives an electromagnetic signal, from which a voltage divider with a variable resistance generates an input voltage for the amplifier. The amplifier's output voltage is compared with a reference voltage. The variable input resistance is adjusted to vary the amplifier's input voltage, until the amplifier's output voltage lies within a defined range around the reference voltage. This adjusted resistance value is compared with nominal resistance values previously stored in a value field and respectively allocated to field strength values, to determine a field strength of the received signal. A circuit arrangement includes an operational amplifier, a memory unit connected to a processor unit, a first voltage divider, a second voltage divider, and a control element that controls the second voltage divider to provide the controlled variable input resistance. The processor unit reads the control state of the control element to determine the adjusted input resistance, and therefrom determines the field strength value of the received signal.

REFERENCES:
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patent: 5773974 (1998-06-01), Kraz
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patent: 6219543 (2001-04-01), Myers et al.
patent: 19753186 (1999-06-01), None
patent: 19852525 (2000-05-01), None
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“Wireless Design Guide/Data Book 2001”, pp. 231 to 237, published by ATMEL Germany GmbH of Heilbronn, Germany.

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