Circuit for automatic adjustment of capacitance in resonant circuit of receiving antenna
A resonant circuit and automatic adjustment technology, applied in electrical components, transmission systems, etc., can solve the problems that affect the receiving quality, the resonant frequency point deviates from the receiving frequency, and the deviation is large, and achieves the effect of improving the receiving quality and increasing the complexity.
Active Publication Date: 2017-05-10
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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- Description
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Problems solved by technology
During the manufacturing process of inductors and capacitors, their values generally have relatively large deviations, which makes the resonance frequency point deviate from the expected receiving frequency and affects the receiving quality
Method used
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Embodiment Construction
[0020] see figure 1 As shown, in an embodiment, the circuit for automatically adjusting capacitance in the receiving antenna resonant circuit includes: an antenna resonant circuit with adjustable capacitance, a radio frequency front-end receiving circuit, a received energy detection circuit and a control circuit.
[0021] combine figure 2 As shown, the antenna resonant circuit with adjustable capacitance includes: a fixed inductance and N capacitors that can be selected to be connected to the circuit, N is a positive integer greater than 1; and from the first capacitor to the Nth capacitor , and its capacitance increases monotonically or decreases monotonically in turn. The input signal of the antenna resonant circuit with adjustable capacitance is the air signal coupled to the inductance, denoted as a, and its output signal is the received signal after passing through the antenna coupling resonant circuit, denoted as b; the N can be selected whether Under the control of th...
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The invention discloses an automatic capacitance adjusting circuit in a resonance circuit of a receiving antenna. The automatic capacitance adjusting circuit comprises a capacitance-adjustable antenna resonance circuit, a radiofrequency front-end receiving circuit, a received energy detecting circuit and a control circuit; the capacitance-adjustable antenna resonance circuit sequentially traverses and selects access capacitance values under the control of a capacitance selection control signal e generated by the control circuit; the radiofrequency front-end receiving circuit is used for performing amplification, down-conversion and channel filtering processing on inputted signals; received signal energy corresponding to the access capacitance value of each radiofrequency front-end receiving circuit is accumulated by the aid of the received energy detecting circuit under the control of an enable signal f outputted by the control circuit; signals inputted into the control circuit are signals d outputted by the received energy detecting circuit, one of signals outputted by the control circuit is the capacitance selection control signal e, and another signal outputted by the control circuit is the enable signal f. The automatic capacitance adjusting circuit has the advantage that the radiofrequency signal receiving quality can be obviously improved by the aid of the automatic capacitance adjusting circuit.
Description
technical field [0001] The invention relates to a circuit for automatically adjusting capacitance in a resonant circuit of a receiving antenna. Background technique [0002] The receiving antenna generally consists of an inductor and a capacitor resonant to the receiving frequency. During the manufacturing process of inductors and capacitors, their values generally have relatively large deviations, which makes the resonance frequency point deviate from the expected receiving frequency and affects the receiving quality. The current commonly used technology is to determine a set of relatively neutral inductance and capacitance values in advance, so that when the final produced inductance and capacitance have deviations, the reception effect is also acceptable. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a circuit for automatically adjusting capacitance in a resonant circuit of a receiving antenna, which ca...
Claims
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IPC IPC(8): H04B1/18
Inventor 王吉健
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT