Quality adjustment of a receiving circuit
First Claim
1. A receiving circuit for a communication device of an access arrangement, the receiving circuit comprising:
- a resonant circuit comprising;
a receiving coil for converting magnetic induction caused by received radio signals into electrical current, anda capacitor,the resonant circuit configured to generate a resonant circuit output signal representing a field strength of the received radio signals,a first resistor;
field strength measurement circuitry configured to measure the field strength of the received radio signals;
telecommunication processing circuitry configured to perform telecommunication-based processing of the resonant circuit output signal; and
switching circuitry operable to switch the receiving circuit between;
a field strength measurement state in which the resonant circuit is connected to the field strength measurement circuitry and the first resistor, the first resistor damping a magnitude of the resonant circuit output signal to allow measurement of the field strength of received radio signals, by the field strength measurement circuitry, based on the dampened resonant circuit output signal; and
a signal processing state in which the resonant circuit is (a) disconnected from the field strength measurement circuitry and the first resistor and (b) connected to the telecommunication processing circuitry, to thereby allow telecommunication-based processing, by the telecommunication processing circuitry, of the resonant circuit output signal undamped by the resistor,such that the resonant circuit is connected to the field strength measurement circuitry in the field strength measurement state of the receiving circuit and disconnected from the field strength measurement circuitry in the signal processing state of the receiving circuit.
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Accused Products
Abstract
A receiving circuit for a communication unit of an access device has a resonance circuit (1) with a receiving coil (L) for converting a magnetic induction into electrical current, and a capacitor (C). The receiving circuit (10) further has a first resistor (R1) and a switching element (3) designed for controllably connecting and disconnecting the first resistor (R1) to the resonance circuit (1). The receiving circuit electrically connects the resonance circuit (1) to the first resistor (R1) when the circuitry of the resonance circuit (1) changes from a first circuitry (7) to a second circuitry (8), and electrically disconnects the first resistor (R1) from the resonance circuit (1) when the circuitry of the resonance circuit (1) changes from the second circuitry (8) to the first circuitry (7).
24 Citations
19 Claims
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1. A receiving circuit for a communication device of an access arrangement, the receiving circuit comprising:
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a resonant circuit comprising; a receiving coil for converting magnetic induction caused by received radio signals into electrical current, and a capacitor, the resonant circuit configured to generate a resonant circuit output signal representing a field strength of the received radio signals, a first resistor; field strength measurement circuitry configured to measure the field strength of the received radio signals; telecommunication processing circuitry configured to perform telecommunication-based processing of the resonant circuit output signal; and switching circuitry operable to switch the receiving circuit between; a field strength measurement state in which the resonant circuit is connected to the field strength measurement circuitry and the first resistor, the first resistor damping a magnitude of the resonant circuit output signal to allow measurement of the field strength of received radio signals, by the field strength measurement circuitry, based on the dampened resonant circuit output signal; and a signal processing state in which the resonant circuit is (a) disconnected from the field strength measurement circuitry and the first resistor and (b) connected to the telecommunication processing circuitry, to thereby allow telecommunication-based processing, by the telecommunication processing circuitry, of the resonant circuit output signal undamped by the resistor, such that the resonant circuit is connected to the field strength measurement circuitry in the field strength measurement state of the receiving circuit and disconnected from the field strength measurement circuitry in the signal processing state of the receiving circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for changing the quality of a resonant circuit of a receiving circuit, the method comprising:
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receiving radio signals at the resonant circuit, and generating a resonant circuit output signal representing a field strength of the received radio signals, operating the receiving circuit in a field strength measurement state in which; the resonant circuit is electrically connected to (i) field strength measurement circuitry configured to measure the field strength of the received radio signals and (ii) a first resistor that dampens a magnitude of the resonant circuit output signal, and the field strength of received radio signals is measured by the field strength measurement circuitry based on the dampened resonant circuit output signal; and the receiving circuit automatically switching to a signal processing state in which; the resonant circuit is (a) electrically disconnected from (i) the field strength measurement circuitry and (ii) the first resistor that dampens the magnitude of the resonant circuit output signal, and (b) electrically connected to telecommunication processing circuitry configured to perform telecommunication-based processing of the resonant circuit output signal, and the resonant circuit output signal undamped by the resistor is processed by the telecommunication processing circuitry, such that the resonant circuit is connected to the field strength measurement circuitry in the field strength measurement state of the receiving circuit and disconnected from the field strength measurement circuitry to the signal processing state of the receiving circuit. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification