CN102098068B - Radio and tuned receiving circuit thereof - Google Patents
Radio and tuned receiving circuit thereof Download PDFInfo
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- CN102098068B CN102098068B CN 200910200304 CN200910200304A CN102098068B CN 102098068 B CN102098068 B CN 102098068B CN 200910200304 CN200910200304 CN 200910200304 CN 200910200304 A CN200910200304 A CN 200910200304A CN 102098068 B CN102098068 B CN 102098068B
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Abstract
The invention provides a radio and a tuned receiving circuit thereof. The radio comprises an antenna circuit and a radio circuit which integrates the tuned receiving circuit, an amplifying circuit and an amplitude modulation local oscillating circuit; the tuned receiving circuit comprises a multistage capacitor array consisting of a trigger, a field effect tube and a capacitor; the output end of the trigger is connected with the grid of the field effect tube, the drain of the field effect tube is connected with the amplitude modulation input, and the source of the field effect tube is connected in series with the capacitor and grounded; the control end of the trigger of the unit circuit of the first stage is connected with a control signal; and the control end of the trigger is connected with the output end of the trigger of the last stage from the unit circuit of the second stage. The tuned receiving circuit is integrated in the radio circuit, and tuned receiving and local oscillating tuning are separated, so the problem of high and low end tracking of an amplitude modulation band in the traditional radio circuit is solved, the number of external components and the complexity of debugging operation are greatly reduced, and tuning in the whole amplitude modulation band is kept with good linearity and resolution.
Description
Technical field
The present invention relates to a kind of broadcast receiver, be specifically related to a kind of for this wireless tuning receiving circuit.
Background technology
At present, the solution of most of multiwave electronic tuning portable radios all is the broadcast receiver system that is made of jointly the receiver circuit of general traditional bipolar technology and corresponding control circuit.When amplitude modulation (AM:Amplitude Modulation) signal receives, generally adopt the tuning receiving circuit that is constituted by variable capacitance diode that is positioned at the receiver circuit outside to cover whole AM band.As shown in Figure 1, broadcast receiver comprises receiver circuit 10, receiver circuit 10 comprises part local oscillator tuning circuit 11 and amplitude modulation High Amplifier Circuit 12, because variable capacitance diode 20 can not be integrated in the receiver circuit 10, the peripheral component number of receiver circuit 10 is numerous, reliability is not high, and system has relatively high expectations to peripheral components, and debugging is complicated.
Because the capacitance variations of variable capacitance diode has non-linear, and the tuning variable capacitance diode of tuning receiving circuit and local oscillator is subjected to the control of phase-locked loop circuit simultaneously, so have the problem of high low side tracking at whole AM band, and make the periphery adjustment of complete machine more complicated.
Summary of the invention
The technical problem to be solved in the present invention is that a kind of tuning receiving circuit of electric capacity linear change is provided.
The technical problem to be solved in the present invention is also to provide a kind of tuning receiving circuit to be integrated in the interior broadcast receiver of receiver circuit.
For solving above-mentioned first technical problem, the invention provides a kind of tuning receiving circuit, described tuning receiving circuit is the capacitor array that comprises some grades of element circuits, described element circuit is by trigger, field effect transistor and electric capacity are formed, the output of trigger connects the grid of field effect transistor, the drain electrode of field effect transistor connects the amplitude modulation input, ground connection behind the source series electric capacity, the trigger control end connection control signal of first order element circuit, from second level element circuit, the input of trigger connects the output of upper level trigger, the clock end input clock signal of the trigger of element circuits at different levels.
In described tuning receiving circuit, field effect transistor can be P type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
For solving above-mentioned second technical problem, the invention provides a kind of broadcast receiver, comprise antenna circuit and receiver circuit, the integrated described tuning receiving circuit of described receiver circuit, amplifying circuit and amplitude modulation local oscillation circuit, described tuning receiving circuit is the capacitor array that comprises some grades of element circuits, described element circuit is by trigger, field effect transistor and electric capacity are formed, the output of trigger connects the grid of field effect transistor, the drain electrode of field effect transistor connects the amplitude modulation input, ground connection behind the source series electric capacity, the trigger control end connection control signal of first order element circuit, from second level element circuit, the control end of trigger connects the output of upper level trigger.Described tuning receiving circuit replaces the variable capacitance diode of traditional circuit outside to finish the tuning reception of amplitude-modulated signal.
In above-mentioned broadcast receiver, described field effect transistor is P type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
In above-mentioned broadcast receiver, described amplifying circuit and amplitude modulation local oscillation circuit can be outside receiver circuits.
In above-mentioned broadcast receiver, the element circuit progression of described capacitor array is determined according to radio station number possible in the whole amplitude modulation frequency band.
Preferably, in above-mentioned broadcast receiver, described capacitor array comprises 133 grades of element circuits.
First technique effect of the present invention is, tuning receiving circuit provided by the invention is compared with traditional variod tuning receiving circuit, and linear capacitor array can make tuning maintenance good linearty and the resolution in whole amplitude modulation frequency range.
Second technique effect of the present invention is, the tuning receiving circuit that the linear capacitance array is formed can be integrated in receiver circuit inside, make the tuning reception of amplitude-modulated signal and local oscillator is tuning is separated, local oscillation circuit is controlled by the output of phase-locked loop circuit, and the tuning capacitor array of directly being regulated in the receiver circuit by bus by control circuit of receiving terminal is finished, avoid the problem of the high low side tracking of AM band in traditional receiver circuit, significantly reduced the quantity of external component and the complexity of debugging work.
High Amplifier Circuit adopts the field effect transistor of high input impedance, can be directly reception of amplitude-modulated signals and the quite high sensitivity of assurance from the aerial coil, farthest reduced outside various tuning components and parts.When reception of amplitude-modulated signals, form LC resonant selecting frequency loop jointly by capacitor array and amplitude modulation aerial coil.The tuned frequency of this moment be that the capacitor array by the tuning receiving circuit of total line traffic control directly determines and the amplitude modulation local oscillation circuit without any relation.
Description of drawings
Fig. 1 is traditional receiver circuit figure.
Fig. 2 is that broadcast receiver provided by the invention is formed structure chart.
Fig. 3 is tuning receiving circuit figure provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Be illustrated in figure 2 as broadcast receiver provided by the invention and form structure chart, comprise receiver circuit 30 and antenna circuit 40, receiver circuit 30 integrated tuning receiving circuits 31, amplifying circuit 32 and amplitude modulation local oscillation circuit (not shown), amplifying circuit 32 and amplitude modulation local oscillation circuit also can be in the receiver circuit outsides, behind antenna circuit 40 reception of amplitude-modulated signals, deliver to tuning receiving circuit 31 and amplifying circuit 32 respectively and carry out tuning and amplification.
As shown in Figures 2 and 3, the tuning receiving circuit 31 that the capacitor array of multiple step format is formed is integrated in receiver circuit 30 inside, can adopt multiple structure or implementation according to the different electric capacity of concrete technology.The mode that the capacitor array setting of tuning receiving circuit 31 can be taked to add up and be merged, concrete internal structure as shown in Figure 3, formed by the multiple step format capacitor array that comprises some grades of element circuits 310, element circuit 310 is by trigger 311, field effect transistor 312 and electric capacity 313 are formed, the output of trigger 311 connects the grid of field effect transistor 312, the drain electrode of field effect transistor 312 connects the amplitude modulation input, source series electric capacity 313 back ground connection, the trigger 311 control end connection control signal of first order element circuit, from second level element circuit, the input of trigger connects the output of upper level trigger, the clock end input clock signal of the trigger of element circuits at different levels.As shown in Figure 3, the switch of trigger 311 control field effect transistor 312, field effect transistor 312 is the N-type metal-oxide-semiconductor among Fig. 3, need carry out capacitor array when arranging, the control end input high level of first trigger 311, and be the square-wave signal of some cycles number in the input of the input end of clock of each trigger 311.After first clock cycle, the grid of field effect transistor 312 uprises, so electric capacity 313 just has been connected between input and the ground.Similarly, because the control end of second trigger is linked in the output of first trigger 311, so after second clock cycle, the grid of field effect transistor uprises, so electric capacity also is connected between input and the ground.If field effect transistor 312 is P type metal-oxide-semiconductor, the control end input low level of first trigger 311 gets final product.
The element circuit progression of capacitor array, namely concrete substep number decides according to the possible radio station number in the whole amplitude modulation frequency band, be example with China, the amplitude modulation radio set frequency begins to finish to most significant end 1710kHz from the 522kHz of least significant end, frequency interval between platform and the platform is 9kHz, 133 possible frequency of radio station points are worth step by step so the whole capacitor array also only needs 133 altogether.Now represent capacitor array 133 substep values from small to large respectively with corresponding ten's digit 0～132.0 represents the minimum value of capacitor array, at this moment the most significant end of corresponding whole amplitude modulation frequency band, i.e. 1710kHz.132 represent the maximum of capacitor array, at this moment the least significant end of corresponding whole amplitude modulation frequency band, i.e. 522kHz.Numeral between 0～132 represents the descending a series of substep values of capacitor array respectively, simultaneously each frequency of corresponding whole amplitude modulation frequency band centre from low to high: 531kHz, 540kHz......1701kHz.In other countries, according to the setting rule of its amplitude modulation radio set frequency, determine possible frequency of radio station point, thus can determining unit circuit progression.
If the capacitor array (n is between 0～132) that numeral is the n representative need be set now, as long as import the signal of n clock cycle, what obtain is exactly that the needed capacitor array that adds up is worth step by step so.If n=0, then expression has only a fixing capacitances in series between input and ground.
Be example with China, always amplitude modulation radio set has 133 possible frequency of radio station points, the whole capacitor array needs 133 element circuits, and as long as so the signal of 133 clock cycle of input, what obtain is exactly that the needed capacitor array that adds up is worth step by step.
Tuning receiving circuit provided by the invention is compared with traditional variod tuning receiving circuit, and the linear capacitance array can make tuning maintenance good linearty and the resolution in whole amplitude modulation frequency range.
The tuning receiving circuit that the linear capacitance array that provides of the present invention is formed can be integrated in receiver circuit inside, and makes the tuning reception of amplitude-modulated signal and local oscillator is tuning is separated.When reception of amplitude-modulated signals, local oscillation circuit is controlled by the output of phase-locked loop circuit, form LC resonant selecting frequency loop jointly by capacitor array and amplitude modulation aerial coil, the tuned frequency of this moment is directly to be determined by the capacitor array value that bus is directly regulated in the receiver circuit, tuning without any relation with the local oscillator of amplitude modulation, avoid the problem of the high low side tracking of AM band in traditional receiver circuit, significantly reduced the quantity of external component and the complexity of debugging work.Because it doesn't matter in the tuning reception of amplitude modulation local oscillator and input now, thus the amplitude modulation local oscillation circuit can also be fully integratible into circuit inside, with the reliability of further minimizing external component and raising system.
High Amplifier Circuit adopts the field effect transistor of high input impedance to make and can directly pick up amplitude-modulated signal and guarantee quite high sensitivity from aerial coil, has farthest reduced outside various tuning components and parts.
Under situation without departing from the spirit and scope of the present invention, can also constitute many very embodiment of big difference that have.Should be appreciated that except as defined by the appended claims, the invention is not restricted at the specific embodiment described in the specification.
Claims (7)
1. tuning receiving circuit, it is characterized in that, described tuning receiving circuit is the capacitor array that comprises some grades of element circuits, described element circuit is made up of trigger, field effect transistor and electric capacity, the output of trigger connects the grid of field effect transistor, the drain electrode of field effect transistor connects the amplitude modulation input, ground connection behind the source series electric capacity, the trigger control end connection control signal of first order element circuit, from second level element circuit, the control end of trigger connects the output of upper level trigger, the clock end input clock signal of the trigger of element circuits at different levels.
2. tuning receiving circuit according to claim 1 is characterized in that, described field effect transistor is P type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
3. broadcast receiver, comprise antenna circuit, it is characterized in that, also comprise receiver circuit, the integrated tuning receiving circuit of described receiver circuit, amplifying circuit and amplitude modulation local oscillation circuit, described tuning receiving circuit is the capacitor array that comprises some grades of element circuits, described element circuit is by trigger, field effect transistor and electric capacity are formed, the output of trigger connects the grid of field effect transistor, the drain electrode of field effect transistor connects amplitude modulation input, ground connection behind the source series electric capacity, the trigger control end connection control signal of first order element circuit, from second level element circuit, the input of trigger connects the output of upper level trigger.
4. broadcast receiver according to claim 3 is characterized in that, described field effect transistor is P type metal-oxide-semiconductor or N-type metal-oxide-semiconductor.
5. broadcast receiver according to claim 3 is characterized in that, described amplifying circuit and amplitude modulation local oscillation circuit also can be outside receiver circuits.
6. according to claim 3 or 4 or 5 described broadcast receivers, it is characterized in that the element circuit progression of described capacitor array is determined according to radio station number possible in the whole amplitude modulation frequency band.
7. broadcast receiver according to claim 6 is characterized in that, described capacitor array comprises 133 grades of element circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910200304 CN102098068B (en) | 2009-12-11 | 2009-12-11 | Radio and tuned receiving circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910200304 CN102098068B (en) | 2009-12-11 | 2009-12-11 | Radio and tuned receiving circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102098068A CN102098068A (en) | 2011-06-15 |
| CN102098068B true CN102098068B (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910200304 Active CN102098068B (en) | 2009-12-11 | 2009-12-11 | Radio and tuned receiving circuit thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109724A (en) * | 1984-12-28 | 1986-06-10 | 索尼公司 | Wireless frequency and volume show |
| EP0569165A2 (en) * | 1992-05-08 | 1993-11-10 | Sony Corporation | Power supply circuit |
| CN2363431Y (en) * | 1998-09-29 | 2000-02-09 | 潘广荣 | FM receiver with electronic tuning and frequency ordering |
-
2009
- 2009-12-11 CN CN 200910200304 patent/CN102098068B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109724A (en) * | 1984-12-28 | 1986-06-10 | 索尼公司 | Wireless frequency and volume show |
| EP0569165A2 (en) * | 1992-05-08 | 1993-11-10 | Sony Corporation | Power supply circuit |
| CN2363431Y (en) * | 1998-09-29 | 2000-02-09 | 潘广荣 | FM receiver with electronic tuning and frequency ordering |
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| Publication number | Publication date |
|---|---|
| CN102098068A (en) | 2011-06-15 |
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Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Patentee after: China Resources micro integrated circuit (Wuxi) Co., Ltd Address before: 301 room 214000, information industry zone, Wuxi New District, Jiangsu Patentee before: WUXI CHINA RESOURCES SEMICO Co.,Ltd. |