CN102064841A - Amplitude shift keying (ASK)/on-off keying (OOK) radio frequency (RF) receiving circuit - Google Patents
Amplitude shift keying (ASK)/on-off keying (OOK) radio frequency (RF) receiving circuit Download PDFInfo
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Abstract
The invention provides an amplitude shift keying (ASK)/on-off keying (OOK) radio frequency (RF) receiving circuit. The receiving circuit is characterized in that after a low noise amplifier amplifies the received signal, the amplified received signal and local oscillation generated by an oscillator are jointly input into a mixer; the mixer reduces the frequency output by the low noise amplifier to intermediate frequency; the intermediate frequency signal output by the mixer is demodulated and output by a peak detection module after being amplified by a primary intermediate frequency amplifier, filtered by an intermediate frequency bandpass filter and amplified by a secondary intermediate frequency amplifier; a charge pump is driven after the peak detection output potential is compared with the fourth reference potential Vref4; the charge pump charges and discharges a capacitor to obtain gain control signals; the gain control signals are fed back to the low noise amplifier, the primary intermediate frequency amplifier and the secondary intermediate frequency amplifier to form an automatic gain control loop; and the low noise amplifier, the primary intermediate frequency amplifier and the secondary intermediate frequency amplifier respectively input the first, second and third reference potentials. The receiving circuit solves the problem of blocking during close range remote control, and meanwhile, the antijamming capability of the receiving circuit is improved and the cost is saved.
Description
Technical field
The present invention relates to the Signal and Information Processing field, especially relate to the radio frequency reception technique.
Background technology
Traditional remote control circuit, the ASK/OOK of employing modulate more as toy car remote control circuit, door and window remote control circuit etc., and its receiving circuit generally has ultra-audio circuit and two kinds of implementations of superheterodyne circuit.Ultra-audio circuit is because cost is low, and circuit is simple, and is highly sensitive and be used widely, but than problems such as super-heterodyne architecture exist a little less than integrated difficulty and the antijamming capability.
The structure of present a kind of superhet radio-frequency (RF) receiving circuit as shown in Figure 1, the signal of antenna reception amplifies the back through low noise amplifier (11) and mixes down to intermediate frequency with the local oscillation signal that local oscillator (17) produces by frequency mixer (12), passes through and exports to back stages of digital decoding circuit by peak detection module (16) demodulation again after one-level intermediate frequency amplifier (13) amplification, if bandpas filter (14) filtering and secondary intermediate frequency amplifier (15) amplify.This stenode circuit is easy to integrated, and circuit stability is better, and antijamming capability is stronger, but has the problem of signal jam in the practical application.In remote control application, according to the difference of transceiver distance, the signal magnitude that antenna receives can from-below the 100dBm near 0dBm on a large scale in change.In order to guarantee the sensitivity of radio-frequency (RF) receiving circuit, gain by low noise amplifier in the radio-frequency (RF) receiving circuit, mixer gain, the overall gain that the gain of one-level intermediate frequency amplifier, the gain of secondary intermediate frequency amplifier and filter gain are formed need reach about 100dV, when the signal amplitude that receives when antenna is big, if it is constant to keep yield value, then partial circuit will be operated in large-scale condition in the radio-frequency (RF) receiving circuit, and non-linear being issued at large-scale condition of circuit to a certain degree will cause the superhet radio-frequency (RF) receiving circuit can't operate as normal.The range of signal of radio-frequency (RF) receiving circuit operate as normal is called the dynamic range of system, so above-mentioned phenomenon is actually the dynamic range deficiency of radio-frequency (RF) receiving circuit.Show as remote control distance in the practical application when very near, the state that appearance can not respond, signal is because too big and be " blocked ".
Solving the not enough universal method of radio-frequency (RF) receiving circuit dynamic range is to increase gain controlling, and by size and the feedback that detects received signal, the each several part gain of control radio-frequency (RF) receiving circuit makes it to be reduced to suitable value, thereby reduces the non-linear of circuit.Owing to do not need external control, this feedback circuit to be commonly referred to as automatic gain control loop (AGC loop).Automatic gain control loop has multiple implementation at present, and as adopting analog to digital converter detection signal size, the control logic switch changes the pure digi-tal mode (as shown in Figure 2) of gain size; Perhaps adopt peak detection block to obtain the analog form that signal magnitude feedbacks the control circuit gain, or the mode of analog-and digital-mixing or the like.Above-mentioned each method all is widely used, but digital form is owing to adopted analog to digital converter, and it takies bigger chip area and power consumption, is unfavorable for the reduction of cost; And the employing analog form, for the sensitivity that guarantees receiving circuit is not suffered a loss, general the gain of intermediate frequency amplifier or frequency mixer is controlled, and if will increase adjusting to low noise amplifier gain to obtain higher dynamic range, generally will feedback signal be carried out controlling each module gain (as shown in Figure 3) more respectively after the computing by the gain controller (gain controller) of complexity.
Summary of the invention
The present invention is intended to solve the deficiencies in the prior art, and the characteristics at the ASK/OOK modulation provide the ASK/OOK that a kind of antijamming capability is strong, highly sensitive, cost is low radio-frequency (RF) receiving circuit.
The ASK/OOK radio-frequency (RF) receiving circuit comprises: low noise amplifier, oscillator, frequency mixer, one-level intermediate frequency amplifier, if bandpas filter, secondary intermediate frequency amplifier, peak detection module, comparator, charge pump, electric capacity; The signal that described low noise amplifier receives antenna amplifies the common input mixer of local oscillator of back and the generation of described oscillator, described frequency mixer is reduced to intermediate frequency with the frequency of low noise amplifier output, the intermediate-freuqncy signal of frequency mixer output is amplified through the one-level intermediate frequency amplifier again, if bandpas filter filtering and secondary intermediate frequency amplifier amplify the back by peak detection module demodulation output, peak detection output compares with the 4th reference potential Vref4, result according to comparator obtains gain control signal Vagc to described capacitor charge and discharge, described gain control signal Vagc feeds back to described low noise amplifier, one-level intermediate frequency amplifier and secondary intermediate frequency amplifier, form automatic gain control loop, described low noise amplifier is imported the first reference potential Vref1, the one-level intermediate frequency amplifier is imported the second reference potential Vref2, the secondary intermediate frequency amplifier is imported the 3rd reference potential Vref3, by to the first reference potential Vref1, being provided with of the second reference potential VVref2 and the 3rd reference potential Vref3 realizes the segmentation control of gain under different received signal amplitudes.
The described first reference potential Vref1, the second reference potential Vref2, the 3rd reference potential Vref3 can provide by the voltage reference circuit of ASK/OOK radio-frequency (RF) receiving circuit, also can be produced by external circuit.
Only when control signal Vagc was near the first reference potential Vref1, the yield value of low noise amplifier was adjustable between its maximum qualification and minimum qualification gain for described low noise amplifier; Only when control signal Vagc was near the second reference potential Vref2, the yield value of one-level intermediate frequency amplifier was adjustable between its maximum qualification and minimum qualification gain for described one-level intermediate frequency amplifier; Only when control signal Vagc was near the 3rd reference potential Vref3, the yield value of secondary intermediate frequency amplifier was adjustable between its maximum qualification and minimum qualification gain for described secondary intermediate frequency amplifier.
Described electric capacity discharges and recharges by charge pump, the ratio of the charging current of described charge pump and discharging current is 1: n, the value of n is determined by system performance: big more if the ASK/OOK radio-frequency (RF) receiving circuit is set at control signal Vagc, its gain is big more, then the discharging current of described charge pump is greater than charging current, and n is the positive number much larger than 1; If it is big more that the ASK/OOK radio-frequency (RF) receiving circuit is set at control signal Vagc, its gain is more little, and then the discharging current of described charge pump should be less than charging current, and n is the positive number much smaller than 1.
Two inputs of described comparator are imported the 4th reference potential Vref4 and peak detection output respectively, two outputs of described comparator connect the charging current source and the discharging current source of charge pump respectively, one end of described electric capacity is connected between charging current source and the discharging current source, the other end ground connection of electric capacity.
If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is big more, then described peak detection output is compared with described the 4th reference potential Vref4, described peak detection is exported the square wave that high electronegative potential is formed: the little or ASK/OOK radio-frequency (RF) receiving circuit of the signal that (1) receives when antenna gains when not enough, described peak detection is exported high electronegative potential and all is lower than the 4th reference potential Vref4, described comparator output charging control logic (0 or 1) is given charge pump, charge pump is that electric capacity continues charging, control signal Vagc rises, thereby increase the yield value of ASK/OOK radio-frequency (RF) receiving circuit, export high potential near the 4th reference potential Vref4 up to detection; (2) signal that receives when antenna is big or the gain of ASK/OOK radio-frequency (RF) receiving circuit is excessive, the high potential of described peak detection output is higher than the 4th reference potential Vref4, electronegative potential is lower than the 4th reference potential Vref4, the square wave of the signal similar before comparator output is modulated with ASK/OOK, charge pump alternately discharges and recharges electric capacity.Because described charge pump discharging current is much larger than charging current, the general effect of charge pump shows as capacitor discharge, control signal Vagc descends, thereby reduces the yield value of ASK/OOK radio-frequency (RF) receiving circuit, exports high potential near the 4th reference potential Vref4 up to detection; (3) there is interference in the signal that receives when antenna, ASK/OOK radio-frequency (RF) receiving circuit gain simultaneously is excessive, peak detection is exported high electronegative potential and all is higher than the 4th reference potential Vref4, comparator output discharge control logic (1 or 0) is given charge pump, charge pump is the electric capacity continuous discharge, and control signal Vagc will reduce, thereby reduces the yield value of ASK/OOK radio-frequency (RF) receiving circuit, near detection output peak value dropped to the 4th reference potential Vref4, interference signal then was reduced to lower position.
If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is more little, then described peak detection output is compared with described the 4th reference potential Vref4, described peak detection is exported the square wave that high electronegative potential is formed: the little or ASK/OOK radio-frequency (RF) receiving circuit of the signal that (1) receives when antenna gains when not enough, described peak detection is exported high electronegative potential and all is lower than the 4th reference potential Vref4, described comparator output discharge control logic (0 or 1) is given charge pump, charge pump is the electric capacity continuous discharge, control signal Vagc descends, thereby reduce the yield value of ASK/OOK radio-frequency (RF) receiving circuit, export high potential near the 4th reference potential Vref4 up to detection; (2) signal that receives when antenna is big or the gain of ASK/OOK radio-frequency (RF) receiving circuit is excessive, the high potential of described peak detection output is higher than the 4th reference potential Vref4, electronegative potential is lower than the 4th reference potential Vref4, the square wave of the signal similar before comparator output is modulated with ASK/OOK, charge pump alternately discharges and recharges electric capacity.Because described charge pump charging current is much larger than discharging current, the general effect of charge pump shows as the electric capacity charging, control signal Vagc rises, thereby increases the yield value of ASK/OOK radio-frequency (RF) receiving circuit, exports high potential near the 4th reference potential Vref4 up to detection; (3) there is interference in the signal that receives when antenna, ASK/OOK radio-frequency (RF) receiving circuit gain simultaneously is excessive, peak detection is exported high electronegative potential and all is higher than the 4th reference potential Vref4, comparator output charging control logic (1 or 0) is given charge pump, charge pump is that electric capacity continues charging, and control signal Vagc will rise, thereby increases the yield value of ASK/OOK radio-frequency (RF) receiving circuit, near detection output peak value dropped to the 4th reference potential Vref4, interference signal then was reduced to lower position.
Described low noise amplifier, the one-level intermediate frequency amplifier, the order of secondary intermediate frequency amplifier gain-adjusted is by the first reference potential Vref1 is set, the second reference potential Vref2 and the 3rd reference potential Vref3 realize, each amplifier is except the effect that the required gain of ASK/OOK radio-frequency (RF) receiving circuit is provided, pre-amplifier also reduces the effect of late-class circuit noise separately, when the signal of antenna reception changes from small to large, keep the gain of secondary intermediate frequency amplifier if at first regulate the gain of low noise amplifier or one-level intermediate frequency amplifier constant, then the signal to noise ratio of circuit output might can not get guaranteeing, the sensitivity of ASK/OOK radio-frequency (RF) receiving circuit reduces.So the adjusting of gain is in proper order: when the signal of antenna reception increases from small to large, regulate the gain of secondary intermediate frequency amplifier earlier, regulate the gain of one-level intermediate frequency amplifier again, regulate low noise amplifier at last and gain.If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is big more, then the first reference potential Vref1＜second reference potential Vref2＜the 3rd reference potential Vref3; If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is more little, then the first reference potential Vref1＞second reference potential Vref2＞the 3rd reference potential Vref3.
Described low noise amplifier, the Gain Adjustable scope of one-level intermediate frequency amplifier and secondary intermediate frequency amplifier can non-overlapping copies, be the same time only to regulate one of them Amplifier Gain and two other gain is constant, also can overlap each other, promptly allow to regulate simultaneously two or three Amplifier Gain, this depends on the needs of practical application.
Obstructing problem when the invention solves closely remote control, when not influencing sensitivity, improved the dynamic range of ASK/OOK radio-frequency (RF) receiving circuit, and when small one and large one two homogenous frequency signal sources exist simultaneously, the ASK/OOK radio-frequency (RF) receiving circuit can reduce yield value according to peak signal, the most less signal is buried at the end of making an uproar, the ASK/OOK radio-frequency (RF) receiving circuit will be correctly decoded according to the signal of maximum, has the strong advantage of antijamming capability.The present invention simultaneously is simple in structure, and the value that only need adjust three reference voltages just can be adjusted the gain-adjusted order and the scope of low noise amplifier and two-stage intermediate frequency amplifier.Compare with other gain controlling modes, only need very little chip area and power consumption.
Description of drawings:
Fig. 1 tradition ASK/OOK superhet radio-frequency (RF) receiving circuit schematic diagram
Fig. 2 tradition has the ASK/OOK superhet radio-frequency (RF) receiving circuit schematic diagram of digital Auto Gain control loop
The ASK/OOK superhet radio-frequency (RF) receiving circuit schematic diagram of Fig. 3 traditional analog automatic gain control loop
Fig. 4 ASK/OOK radio-frequency (RF) receiving circuit of the present invention schematic diagram
The gain of Fig. 5 ASK/OOK radio-frequency (RF) receiving circuit of the present invention-control voltage curve
The comparator of Fig. 6 ASK/OOK radio-frequency (RF) receiving circuit of the present invention and charge pump schematic diagram
The control signal Vagc of Fig. 7 ASK/OOK radio-frequency (RF) receiving circuit of the present invention and the 4th reference potential be schematic diagram relatively
Embodiment
Below in conjunction with accompanying drawing content of the present invention is further specified.
The ASK/OOK radio-frequency (RF) receiving circuit, as shown in Figure 4, comprise: low noise amplifier (41), oscillator (50), frequency mixer (42), one-level intermediate frequency amplifier (43), if bandpas filter (44), secondary intermediate frequency amplifier (45), peak detection module (46), comparator (47), charge pump (48), electric capacity, the signal that described low noise amplifier (41) receives antenna amplifies the common input mixer of local oscillator (42) of back and described oscillator (50) generation, described frequency mixer (42) is reduced to intermediate frequency with the frequency of low noise amplifier (41) output, the intermediate-freuqncy signal of frequency mixer (42) output is amplified (43) through the one-level intermediate frequency amplifier again, if bandpas filter filtering (44) and secondary intermediate frequency amplifier (45) amplify the back by peak detection module (46) demodulation output, peak detection output compares the described charge pump of rear drive (48) with the 4th reference potential Vref4, charge pump (48) obtains gain control signal Vagc to described capacitor charge and discharge, described gain control signal Vagc feeds back to described low noise amplifier (41), one-level intermediate frequency amplifier (43) and secondary intermediate frequency amplifier (45), form automatic gain control loop, described low noise amplifier (41) the input first reference potential Vref1, one-level intermediate frequency amplifier (43) the input second reference potential Vref2, secondary intermediate frequency amplifier (45) input the 3rd reference potential Vref3, by to the first reference potential Vref1, being provided with of the second reference potential VVref2 and the 3rd reference potential Vref3 realizes the segmentation control of gain under different received signal amplitudes.
The described first reference potential Vref1, the second reference potential Vref2, the 3rd reference potential Vref3 can provide by the voltage reference circuit (49) of ASK/OOK radio-frequency (RF) receiving circuit, also can be produced by external circuit.
Only when control signal Vagc was near the first reference potential Vref1, the yield value of low noise amplifier (41) was adjustable between its maximum qualification and minimum qualification gain for described low noise amplifier (41); Only when control signal Vagc was near the second reference potential Vref2, the yield value of one-level intermediate frequency amplifier (43) was adjustable between its maximum qualification and minimum qualification gain for described one-level intermediate frequency amplifier (43); Only when control signal Vagc was near the 3rd reference potential Vref3, the yield value of secondary intermediate frequency amplifier (45) was adjustable between its maximum qualification and minimum qualification gain for described secondary intermediate frequency amplifier (45).
The charging current of described charge pump (48) and the ratio of discharging current are 1: n, the value of n is determined by system performance: big more if the ASK/OOK radio-frequency (RF) receiving circuit is set at control signal Vagc, its gain is big more, the discharging current of then described charge pump (48) is greater than charging current, and n is the positive number much larger than 1; If it is big more that the ASK/OOK radio-frequency (RF) receiving circuit is set at control signal Vagc, its gain is more little, and the discharging current of then described charge pump (48) should be less than charging current, and n is the positive number much smaller than 1.
As shown in Figure 6, two inputs of described comparator (47) are imported the 4th reference potential Vref4 and peak detection output respectively, two outputs of described comparator (47) connect the charging current source and the discharging current source of charge pump (48) respectively, one end of described electric capacity is connected between charging current source and the discharging current source, the other end ground connection of electric capacity.
If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is big more, then described peak detection output is compared with described the 4th reference potential Vref4, as shown in Figure 7, described peak detection is exported the square wave that high electronegative potential is formed: the little or ASK/OOK radio-frequency (RF) receiving circuit of the signal that (1) receives when antenna gains when not enough, described peak detection is exported high electronegative potential and all is lower than the 4th reference potential Vref4, described comparator output charging control logic (0 or 1) is given charge pump (48), charge pump (48) continues charging for electric capacity, control signal Vagc rises, thereby increase the yield value of ASK/OOK radio-frequency (RF) receiving circuit, export high potential near the 4th reference potential Vref4 up to detection; (2) signal that receives when antenna is big or the gain of ASK/OOK radio-frequency (RF) receiving circuit is excessive, the high potential of described peak detection output is higher than the 4th reference potential Vref4, electronegative potential is lower than the 4th reference potential Vref4, the square wave of the signal similar before comparator (47) output is modulated with ASK/OOK, charge pump (48) alternately discharges and recharges electric capacity.Because described charge pump discharging current is much larger than charging current, the general effect of charge pump shows as capacitor discharge, control signal Vagc descends, thereby reduces the yield value of ASK/OOK radio-frequency (RF) receiving circuit, exports high potential near the 4th reference potential Vref4 up to detection; (3) there is interference in the signal that receives when antenna, ASK/OOK radio-frequency (RF) receiving circuit gain simultaneously is excessive, peak detection is exported high electronegative potential and all is higher than the 4th reference potential Vref4, comparator (47) output discharge control logic (1 or 0) is given charge pump (48), charge pump (48) is the electric capacity continuous discharge, control signal Vagc will reduce, thereby reduce the yield value of ASK/OOK radio-frequency (RF) receiving circuit, near detection output peak value dropped to the 4th reference potential Vref4, interference signal then was reduced to lower position.
If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is more little, then described peak detection output is compared with described the 4th reference potential Vref4, as shown in Figure 7, described peak detection is exported the square wave that high electronegative potential is formed: the little or ASK/OOK radio-frequency (RF) receiving circuit of the signal that (1) receives when antenna gains when not enough, described peak detection is exported high electronegative potential and all is lower than the 4th reference potential Vref4, described comparator (47) output discharge control logic (0 or 1) is given charge pump (48), charge pump (48) is the electric capacity continuous discharge, control signal Vagc descends, thereby reduce the yield value of ASK/OOK radio-frequency (RF) receiving circuit, export high potential near the 4th reference potential Vref4 up to detection; (2) signal that receives when antenna is big or the gain of ASK/OOK radio-frequency (RF) receiving circuit is excessive, the high potential of described peak detection output is higher than the 4th reference potential Vref4, electronegative potential is lower than the 4th reference potential Vref4, the square wave of the signal similar before comparator (47) output is modulated with ASK/OOK, charge pump (48) alternately discharges and recharges electric capacity.Because described charge pump (48) charging current is much larger than discharging current, the general effect of charge pump (48) shows as the electric capacity charging, control signal Vagc rises, thereby increases the yield value of ASK/OOK radio-frequency (RF) receiving circuit, exports high potential near the 4th reference potential Vref4 up to detection; (3) there is interference in the signal that receives when antenna, ASK/OOK radio-frequency (RF) receiving circuit gain simultaneously is excessive, peak detection is exported high electronegative potential and all is higher than the 4th reference potential Vref4, comparator (47) output charging control logic (1 or 0) is given charge pump (48), charge pump (48) continues charging for electric capacity, control signal Vagc will rise, thereby increase the yield value of ASK/OOK radio-frequency (RF) receiving circuit, near detection output peak value dropped to the 4th reference potential Vref4, interference signal then was reduced to lower position.
Described low noise amplifier, the one-level intermediate frequency amplifier, the order of secondary intermediate frequency amplifier gain-adjusted is by the first reference potential Vref1 is set, the second reference potential Vref2 and the 3rd reference potential Vref3 realize, each amplifier is except the effect that the required gain of ASK/OOK radio-frequency (RF) receiving circuit is provided, pre-amplifier also reduces the effect of late-class circuit noise separately, when the signal of antenna reception changes from small to large, keep the gain of secondary intermediate frequency amplifier if at first regulate the gain of low noise amplifier or one-level intermediate frequency amplifier constant, then the signal to noise ratio of circuit output might can not get guaranteeing, the sensitivity of ASK/OOK radio-frequency (RF) receiving circuit reduces.So the adjusting of gain is in proper order: when the signal of antenna reception increases from small to large, regulate the gain of secondary intermediate frequency amplifier earlier, regulate the gain of one-level intermediate frequency amplifier again, regulate low noise amplifier at last and gain.If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is big more, then the first reference potential Vref1＜second reference potential Vref2＜the 3rd reference potential Vref3; If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is more little, then the first reference potential Vref1＞second reference potential Vref2＞the 3rd reference potential Vref3.
Described low noise amplifier (41), the Gain Adjustable scope of one-level intermediate frequency amplifier (43) and secondary intermediate frequency amplifier (45) can non-overlapping copies, be the same time only to regulate one of them Amplifier Gain and two other gain is constant, also can overlap each other, promptly allow to regulate simultaneously two or three Amplifier Gain, this depends on low noise amplifier in the ASK/OOK radio-frequency (RF) receiving circuit, the dynamic range of each circuit in the gain of one-level intermediate frequency amplifier (43) and secondary intermediate frequency amplifier (45) and the ASK/OOK radio-frequency (RF) receiving circuit.
For ease of explanation, Figure 5 shows that the same time only regulates low noise amplifier (41), an Amplifier Gain in one-level intermediate frequency amplifier (43) and the secondary intermediate frequency amplifier (45) and two other gain is constant.Suppose that control signal Vagc is big more, its gain is big more, can see, when the signal that antenna receives less, when being in diagram first range of signal, control signal Vagc will change near the 3rd reference potential Vref3, regulate the gain of secondary intermediate frequency amplifier (45); The signal that receives when antenna reaches median size, and when being in the diagram secondary signal scope, control signal Vagc will change near the second reference potential Vref2, regulate one-level intermediate frequency amplifier (43) gain; The signal that receives when antenna is bigger, and when being in diagram the 3rd range of signal, control signal Vagc changes near the first reference potential Vref1, regulates the gain of low noise amplifier (41).
Similarly, if allow to regulate simultaneously low noise amplifier (41), adjacent two or three Amplifier Gain in one-level intermediate frequency amplifier (43) and the secondary intermediate frequency amplifier (45), the signal that antenna receives can be divided into five scopes from small to large: when the signal of antenna reception is in first and second range of signals, regulate secondary intermediate frequency amplifier (45) gain; When the signal of antenna reception is in the second, the third and fourth range of signal, regulate one-level intermediate frequency amplifier (43) gain; When the signal of antenna reception is in the 4th and the 5th range of signal, regulate low noise amplifier (41) gain.Other multiple overlap modes can also be arranged certainly, can design as required.
The invention discloses the ASK/OOK radio-frequency (RF) receiving circuit, and describe the specific embodiment of the present invention and effect with reference to the accompanying drawings.What should be understood that is: the foregoing description is just to explanation of the present invention; rather than limitation of the present invention; any innovation and creation that do not exceed in the connotation scope of the present invention; include but not limited to the local structure of circuit change, to the replacement of the type or the model of components and parts; and the replacement of other unsubstantialities or modification, all fall within the protection range of the present invention.
Claims (7)
1.ASK/OOK radio-frequency (RF) receiving circuit, it is characterized in that comprising: low noise amplifier, oscillator, frequency mixer, the one-level intermediate frequency amplifier, if bandpas filter, the secondary intermediate frequency amplifier, the peak detection module, comparator, charge pump, electric capacity, the signal that described low noise amplifier receives antenna amplifies the common input mixer of local oscillator of back and the generation of described oscillator, described frequency mixer is reduced to intermediate frequency with the frequency of low noise amplifier output, the intermediate-freuqncy signal of frequency mixer output is amplified through the one-level intermediate frequency amplifier again, if bandpas filter filtering and secondary intermediate frequency amplifier amplify the back by peak detection module demodulation output, peak detection output compares with the 4th reference potential Vref4, output result according to comparator obtains gain control signal Vagc to described capacitor charge and discharge, described gain control signal Vagc feeds back to described low noise amplifier, one-level intermediate frequency amplifier and secondary intermediate frequency amplifier, form automatic gain control loop, described low noise amplifier is imported the first reference potential Vref1, the one-level intermediate frequency amplifier is imported the second reference potential Vref2, the secondary intermediate frequency amplifier is imported the 3rd reference potential Vref3, by to the first reference potential Vref1, being provided with of the second reference potential Vref2 and the 3rd reference potential Vref3 realizes the segmentation control of gain under different received signal amplitudes.
2. ASK/OOK radio-frequency (RF) receiving circuit according to claim 1, it is characterized in that described low noise amplifier only when control signal Vagc is near the first reference potential Vref1, the yield value of low noise amplifier its maximum limit and minimum limit between the gain adjustable; Only when control signal Vagc was near the second reference potential Vref2, the yield value of one-level intermediate frequency amplifier was adjustable between its maximum qualification and minimum qualification gain for described one-level intermediate frequency amplifier; Only when control signal Vagc was near the 3rd reference potential Vref3, the yield value of secondary intermediate frequency amplifier was adjustable between its maximum qualification and minimum qualification gain for described secondary intermediate frequency amplifier.
3. ASK/OOK radio-frequency (RF) receiving circuit according to claim 1, it is characterized in that by charge pump described capacitor charge and discharge, the ratio of the charging current of described charge pump and discharging current is 1: n, the value of n is determined by system performance: if expectation ASK/OOK radio-frequency (RF) receiving circuit is set at control signal Vagc when big more, its gain is big more, then the discharging current of described charge pump is greater than charging current, and n is the positive number much larger than 1; If expectation ASK/OOK radio-frequency (RF) receiving circuit is set at control signal Vagc when big more, its gain is more little, and then the discharging current of described charge pump should be less than charging current, and n is the positive number much smaller than 1.
4. ASK/OOK radio-frequency (RF) receiving circuit according to claim 1, two inputs that it is characterized in that described comparator are imported the 4th reference potential Vref4 and peak detection output respectively, two outputs of described comparator connect the charging current source and the discharging current source of charge pump respectively, one end of described electric capacity is connected between charging current source and the discharging current source, the other end ground connection of electric capacity.
5. ASK/OOK radio-frequency (RF) receiving circuit according to claim 1, it is characterized in that described low noise amplifier, the one-level intermediate frequency amplifier, the order of secondary intermediate frequency amplifier gain-adjusted is by being provided with the first reference potential Vref1, the second reference potential Vref2 and the 3rd reference potential Vref3 realize, if expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is big more, then the first reference potential Vref1＜second reference potential Vref2＜the 3rd reference potential Vref3; If expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is more little, then the first reference potential Vref1＞second reference potential Vref2＞the 3rd reference potential Vref3.
6. as ASK/OOK radio-frequency (RF) receiving circuit as described in right 1,2,3,4 or 5, it is characterized in that if expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is big more, then described peak detection output is compared with described the 4th reference potential Vref4, and described peak detection is exported the square wave that high electronegative potential is formed; (1) the little or ASK/OOK radio-frequency (RF) receiving circuit of the signal that receives when antenna gains when not enough, described peak detection is exported high electronegative potential and all is lower than the 4th reference potential Vref4, described comparator output charging control logic (0 or 1) is given charge pump, charge pump is that electric capacity continues charging, control signal Vagc rises, thereby increase the yield value of ASK/OOK radio-frequency (RF) receiving circuit, export high potential near the 4th reference potential Vref4 up to detection; (2) signal that receives when antenna is big or the gain of ASK/OOK radio-frequency (RF) receiving circuit is excessive, the high potential of described peak detection output is higher than the 4th reference potential Vref4, electronegative potential is lower than the 4th reference potential Vref4, the square wave of the signal similar before comparator output is modulated with ASK/OOK, charge pump alternately discharges and recharges electric capacity.Because described charge pump discharging current is much larger than charging current, the general effect of charge pump shows as capacitor discharge,, control signal Vagc descends, thereby reduce the yield value of ASK/OOK radio-frequency (RF) receiving circuit, export high potential near the 4th reference potential Vref4 up to detection; (3) there is interference in the signal that receives when antenna, ASK/OOK radio-frequency (RF) receiving circuit gain simultaneously is excessive, peak detection is exported high electronegative potential and all is higher than the 4th reference potential Vref4, comparator output discharge control logic (1 or 0) is given charge pump, charge pump is the electric capacity continuous discharge, and control signal Vagc will reduce, thereby reduces the yield value of ASK/OOK radio-frequency (RF) receiving circuit, near detection output peak value dropped to the 4th reference potential Vref4, interference signal then was reduced to lower position.
7. as ASK/OOK radio-frequency (RF) receiving circuit as described in right 1,2,3,4 or 5, it is characterized in that if expectation ASK/OOK radio-frequency (RF) receiving circuit is when control signal Vagc is big more, its gain is more little, then described peak detection output is compared with described the 4th reference potential Vref4, and described peak detection is exported the square wave that high electronegative potential is formed; (1) the little or ASK/OOK radio-frequency (RF) receiving circuit of the signal that receives when antenna gains when not enough, described peak detection is exported high electronegative potential and all is lower than the 4th reference potential Vref4, described comparator output discharge control logic (0 or 1) is given charge pump, charge pump is the electric capacity continuous discharge, control signal Vagc descends, thereby reduce the yield value of ASK/OOK radio-frequency (RF) receiving circuit, export high potential near the 4th reference potential Vref4 up to detection; (2) signal that receives when antenna is big or the gain of ASK/OOK radio-frequency (RF) receiving circuit is excessive, the high potential of described peak detection output is higher than the 4th reference potential Vref4, electronegative potential is lower than the 4th reference potential Vref4, the square wave of the signal similar before comparator output is modulated with ASK/OOK, charge pump alternately discharges and recharges electric capacity.Because described charge pump charging current is much larger than discharging current, the general effect of charge pump shows as the electric capacity charging,, control signal Vagc rises, thereby increase the yield value of ASK/OOK radio-frequency (RF) receiving circuit, export high potential near the 4th reference potential Vref4 up to detection; (3) there is interference in the signal that receives when antenna, ASK/OOK radio-frequency (RF) receiving circuit gain simultaneously is excessive, peak detection is exported high electronegative potential and all is higher than the 4th reference potential Vref4, comparator output charging control logic (1 or 0) is given charge pump, charge pump is that electric capacity continues charging, and control signal Vagc will rise, thereby increases the yield value of ASK/OOK radio-frequency (RF) receiving circuit, near detection output peak value dropped to the 4th reference potential Vref4, interference signal then was reduced to lower position.
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| CN200910153844.9A CN102064841B (en) | 2009-11-16 | 2009-11-16 | Amplitude shift keying (ASK)/on-off keying (OOK) radio frequency (RF) receiving circuit |
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| CN200910153844.9A CN102064841B (en) | 2009-11-16 | 2009-11-16 | Amplitude shift keying (ASK)/on-off keying (OOK) radio frequency (RF) receiving circuit |
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| CN103427858A (en) * | 2013-08-08 | 2013-12-04 | 北京昆腾微电子有限公司 | Automatic gain control device and method, radio frequency receiver chip and radio frequency receiving machine |
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| CN106505959B (en) * | 2016-10-18 | 2020-01-14 | 武汉凡谷电子技术股份有限公司 | AGC control loop of high-gain radio frequency channel of digital microwave system |
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