Radio frequency circuit
AssigneeRichWave Technology Corp.
InventorsHwey-Ching Chien, Chih-Sheng Chen, Jhao-Yi Lin, Ching-Wen Hsu
Life of this patent
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Abstract
The frequency detector includes a first impedance circuit and a second impedance circuit. The first impedance circuit has a first terminal for receiving an input signal, and a second terminal for outputting a divisional signal. The second impedance circuit has a first terminal coupled to the second terminal of the first impedance circuit, and a second terminal coupled to a first system voltage terminal. The frequency response of the first impedance circuit is different from a frequency response of the second impedance circuit. The resistance of the first impedance circuit, a resistance of the second impedance circuit, and the divisional signal change with a frequency of the input signal.
Claims17
A frequency detector comprising:
- a first impedance circuit having a first terminal configured to receive an input signal, and a second terminal configured to output a divisional signal, and comprising a resistor, a capacitor, and an imaginary impedance unit coupled in series between the first terminal and the second terminal of the first impedance circuit;
- and
- a second impedance circuit having a first terminal coupled to the second terminal of the first impedance circuit, and a second terminal coupled to a first system voltage terminal;
- wherein:
- a frequency response of the first impedance circuit is different from a frequency response of the second impedance circuit;
- and
- a resistance of the first impedance circuit, a resistance of the second impedance circuit, and the divisional signal change with a frequency of the input signal.
A frequency detector comprising:
- a first impedance circuit having a first terminal configured to receive an input signal, and a second terminal configured to output a divisional signal;
- a second impedance circuit having a first terminal coupled to the second terminal of the first impedance circuit, and a second terminal coupled to a first system voltage terminal;
- and
- a signal rectifier coupled to the second terminal of the first impedance circuit, and configured to receive the divisional signal and generate a detection signal by rectifying the divisional signal;
- wherein:
- a frequency response of the first impedance circuit is different from a frequency response of the second impedance circuit;
- and
- a resistance of the first impedance circuit, a resistance of the second impedance circuit, and the divisional signal change with a frequency of the input signal.
A radio frequency circuit comprising:
- a frequency detector comprising:
- a first impedance circuit having a first terminal configured to receive an input signal, and a second terminal configured to output a divisional signal, wherein the frequency detector outputs a detection signal according to the divisional signal;
- and
- a second impedance circuit having a first terminal coupled to the second terminal of the first impedance circuit, and a second terminal coupled to a first system voltage terminal;
- and
- a signal processing unit configured to process the input signal, and adjust a frequency response of the signal processing unit according to the detection signal;
- wherein:
- a frequency response of the first impedance circuit is different from a frequency response of the second impedance circuit;
- a resistance of the first impedance circuit, a resistance of the second impedance circuit, and the divisional signal change with a frequency of the input signal;
- and
- the signal processing unit comprises:
- an amplifier, the signal processing unit being configured to adjust a matching impedance of the amplifier according to the detection signal;
- or
- a plurality of amplifiers, the signal processing unit being configured to activate a corresponding number of amplifiers of the plurality of amplifiers to adjust a gain of the signal processing unit for amplifying the input signal according to the detection signal;
- or
- an amplifier, the signal processing unit being configured to adjust a bias voltage applied to the amplifier according to the detection signal.
Dependencies are inferred from the claim text.