CN203368453U - Automatic gain control device, radio frequency receiver chip and radio frequency receiver - Google Patents
Automatic gain control device, radio frequency receiver chip and radio frequency receiver Download PDFInfo
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- CN203368453U CN203368453U CN 201320483943 CN201320483943U CN203368453U CN 203368453 U CN203368453 U CN 203368453U CN 201320483943 CN201320483943 CN 201320483943 CN 201320483943 U CN201320483943 U CN 201320483943U CN 203368453 U CN203368453 U CN 203368453U
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Abstract
The utility model relates to an automatic gain control device, a radio frequency receiver chip and a radio frequency receiver. The automatic gain control device includes: a radio frequency front-end module used for converting a radio frequency signal to an intermediate frequency signal, a radio frequency peak detector used for detecting an amplitude value of the radio frequency signal; an intermediate frequency peak detector used for detecting an amplitude value of the intermediate frequency signal; and an automatic gain control module used for controlling a maximum gain of the radio frequency front-end module according to the amplitude value of the radio frequency signal and for controlling a gain of the radio frequency front-end module according to the amplitude value of the intermediate frequency signal. According to the utility model, when the radio frequency signal deviates greatly from the local oscillation signal frequency and the amplitude of the radio frequency signal is far larger, the signal of the radio frequency front-end module in the chip is enabled to work in the linear manner, and the problem that the interference signal is generated during the intermediate frequency signal processing stage is solved.
Description
Technical field
The utility model relates to the radio frequency reception technical field, relates in particular to a kind of automatic gain control equipment, radiofrequency receiving chip and radio-frequency transmitter.
Background technology
As shown in Figure 1, structural representation for radio-frequency transmitter in prior art, this radio-frequency transmitter comprises antenna 11, RF front-end module 12, analog to digital converter 13, digital signal processor 14, digital to analog converter 15 and automatic gain control module 16, wherein, RF front-end module 12 comprises: the first variable gain amplifying unit 121, local oscillator 122, frequency mixer 123, low pass filter 124 and the second variable gain amplifying unit 125.The processing procedure of this radio-frequency transmitter is as follows: antenna 11 received RF signals, output to radio-frequency front-end processing module 12 and carry out the signal processing, wherein, radiofrequency signal outputs to frequency mixing module 123 after the first variable gain amplifying unit 121 amplifies processing, frequency mixing module 123 will be amplified local oscillated signal that radiofrequency signal after processing and local oscillator 122 produce and be carried out Frequency mixing processing and output to low pass filter 124 and carry out filtering, then output to the second variable gain amplifying unit 125 and amplify and export analog if signal; Wherein, automatic gain control module 16 is controlled the gain size of the first variable gain amplifying unit 121 and the second variable gain amplifying unit 125, makes the analog if signal of the unified level of RF front-end module 12 output.Analog to digital converter 13 is transformed into digital medium-frequency signal by analog if signal and outputs in digital signal processor 14 and carry out a series of signal processing, comprise that image frequency suppresses processing, frequency-selective filtering processing, demodulation process and audio frequency filtering and processes, demodulate digital audio and video signals, this digital audio and video signals is transformed into simulated audio signal through digital to analog converter 15, then output.Yet, in radio communication, the size of transmitting station power, receiver all can make input signal strength have a greater change from the distance of transmitting station distance and the variation of signal environmental condition in communication process etc.
As shown in Figure 2, fundamental diagram for the automatic gain control module in the structural representation of the radio-frequency transmitter shown in Fig. 1 in prior art, Fig. 2 A means radiofrequency signal and the nearer situation of local oscillated signal frequency phase-difference, and Fig. 2 B means radiofrequency signal and local oscillated signal frequency phase-difference situation far away.The frequency that equals radiofrequency signal due to the frequency of intermediate-freuqncy signal deducts the frequency of local oscillated signal, so radiofrequency signal of same magnitude, the frequency phase-difference of radiofrequency signal and local oscillated signal more, the frequency of intermediate-freuqncy signal is just larger, and, due to the filter action of low pass filter, the amplitude of intermediate-freuqncy signal can be low pass filtering the more of device decay.Situation shown in Fig. 2 A, radiofrequency signal and local oscillated signal frequency phase-difference are nearer, and the frequency of intermediate-freuqncy signal is less, so intermediate-freuqncy signal substantially can be all by low pass filter, and amplitude fading is less, the RF front-end module linear work; Situation shown in Fig. 2 B, radiofrequency signal and local oscillated signal frequency phase-difference are far away, the frequency of intermediate-freuqncy signal is larger, therefore it is a lot of that the amplitude of intermediate-freuqncy signal is low pass filtering the device decay, and the automatic gain control module will control the first variable gain amplifying unit and the second variable gain amplifying unit works in larger gain; Yet, in situation shown in Fig. 2 B, if the power of radiofrequency signal is larger, and the first variable gain amplifying unit and the second variable gain amplifying unit are operated in again high-gain lower time, the RF front-end module nonlinear operation, make the harmonic wave of radiofrequency signal and the harmonic wave of local oscillated signal sneak into interference signal in intermediate-freuqncy signal.
The utility model content
The utility model provides a kind of automatic gain control equipment, radiofrequency receiving chip and radio-frequency transmitter, in order to realize departing from the local oscillated signal frequency far and radiofrequency signal amplitude when larger when radio frequency signal frequency, can be so that the RF front-end module linear work, eliminate the interference that the harmonic wave of the harmonic wave of radiofrequency signal and local oscillated signal causes intermediate-freuqncy signal.
The utility model provides a kind of automatic gain control equipment for radio-frequency transmitter, comprising:
RF front-end module, for being converted to intermediate-freuqncy signal by radiofrequency signal;
The radio frequency peak detector, for detection of the range value of described radiofrequency signal;
The intermediate frequency peak detector, for detection of the range value of described intermediate-freuqncy signal;
The automatic gain control module, control the maximum gain of described RF front-end module for the range value according to described radiofrequency signal, control the gain of described RF front-end module according to the range value of described intermediate-freuqncy signal.
The utility model also provides a kind of radiofrequency receiving chip, comprising: automatic gain control equipment, analog to digital converter, digital signal processor and digital to analog converter, described automatic gain control equipment comprises aforesaid automatic gain control equipment.
The utility model also provides a kind of radio-frequency transmitter, comprising: antenna and radiofrequency receiving chip, described radiofrequency receiving chip comprises aforesaid radiofrequency receiving chip.
In the utility model, RF front-end module is converted to intermediate-freuqncy signal by radiofrequency signal, the radio frequency peak detector detects the range value of radiofrequency signal, the intermediate frequency peak detector detects the range value of intermediate-freuqncy signal, the automatic gain control module is controlled the maximum gain of RF front-end module according to the range value of radiofrequency signal, control the gain of RF front-end module according to the range value of intermediate-freuqncy signal, like this, can realize departing from the far away and radiofrequency signal amplitude of local oscillated signal frequency when larger when radio frequency signal frequency, can make the RF front-end module linear work, the interference that the harmonic wave of elimination radiofrequency signal and the harmonic wave of local oscillated signal cause intermediate-freuqncy signal.Can also realize two kinds of functions of radio frequency peak detector and intermediate frequency peak detector, the intermediate frequency peak detector is controlled the linear condition of RF front-end module gain simultaneously, and the radio frequency peak detector is controlled the maximum of RF front-end module gain.
The accompanying drawing explanation
The structural representation that Fig. 1 is radio-frequency transmitter in prior art;
The fundamental diagram of the automatic gain control module in the structural representation that Fig. 2 is the radio-frequency transmitter shown in Fig. 1 in prior art;
Fig. 3 is the structural representation of the utility model for the automatic gain control equipment embodiment of radio-frequency transmitter;
Fig. 4 is first structural representation of the utility model for the automatic gain control module in structural representation shown in automatic gain control equipment embodiment Fig. 3 of radio-frequency transmitter;
Fig. 5 is the fundamental diagram of the utility model for the automatic gain control module in structural representation shown in automatic gain control equipment embodiment Fig. 4 of radio-frequency transmitter;
Fig. 6 is second structural representation of the utility model for the automatic gain control module in structural representation shown in automatic gain control equipment embodiment Fig. 3 of radio-frequency transmitter;
Fig. 7 is the fundamental diagram of the utility model for the automatic gain control module in structural representation shown in automatic gain control equipment embodiment Fig. 6 of radio-frequency transmitter;
Fig. 8 is the schematic flow sheet of the utility model for the auto gain control method embodiment of radio-frequency transmitter;
The structural representation that Fig. 9 is the utility model radiofrequency receiving chip embodiment;
The structural representation that Figure 10 is the utility model radio-frequency transmitter embodiment.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the utility model will be further described.
As shown in Figure 3, for the structural representation of the utility model for the automatic gain control equipment embodiment of radio-frequency transmitter, this automatic gain control equipment 30 can comprise: RF front-end module 12, radio frequency peak detector 31, intermediate frequency peak detector 32 and automatic gain control module 16, radio frequency peak detector 31 is connected to the input of RF front-end module 12, intermediate frequency peak detector 32 is connected to the output of RF front-end module 12, automatic gain control module 16 respectively with RF front-end module 12, radio frequency peak detector 31 is connected with intermediate frequency peak detector 32.
RF front-end module 12 is for being converted to intermediate-freuqncy signal by radiofrequency signal; Radiofrequency signal is by antenna reception; Radio frequency peak detector 31 is for detection of the range value of radiofrequency signal; Intermediate frequency peak detector 32 is for detection of the range value of intermediate-freuqncy signal; Automatic gain control module 16 is controlled the maximum gain of RF front-end module for the range value according to radiofrequency signal, control the gain of RF front-end module according to the range value of intermediate-freuqncy signal.
In the present embodiment, RF front-end module 12 is converted to intermediate-freuqncy signal by radiofrequency signal, radio frequency peak detector 31 detects the range value of radiofrequency signal, intermediate frequency peak detector 32 detects the range value of intermediate-freuqncy signal, automatic gain control module 16 is controlled the maximum gain of RF front-end module according to the range value of radiofrequency signal, control the gain of RF front-end module according to the range value of intermediate-freuqncy signal, like this, realize that the radio frequency peak value detects and the intermediate frequency peak value detects two kinds of functions simultaneously, control the linear condition of RF front-end module gain according to intermediate frequency peak value testing result, control the maximum of RF front-end module gain according to radio frequency peak value testing result, can realize departing from the far away and radiofrequency signal amplitude of local oscillated signal frequency when larger when radio frequency signal frequency, can make the RF front-end module linear work, the interference that the harmonic wave of elimination radiofrequency signal and the harmonic wave of local oscillated signal cause intermediate-freuqncy signal.
Alternatively, as shown in Figure 4, for first structural representation of the utility model for the automatic gain control module in structural representation shown in automatic gain control equipment embodiment Fig. 3 of radio-frequency transmitter, automatic gain control module 16 can comprise: radio frequency adjustment unit 161 and the first intermediate frequency adjustment unit 162; When radio frequency adjustment unit 161 is less than the radio frequency threshold value for the range value when radiofrequency signal, controlling maximum gain is the first maximum gain; When the range value of radiofrequency signal is greater than the radio frequency threshold value, controlling maximum gain is the second maximum gain, makes the range value of radiofrequency signal equal the radio frequency threshold value; The maximum radio frequency signal amplitude value that the radio frequency threshold value is RF front-end module 12 linear works, the radio frequency threshold value can be 32mV.When the first intermediate frequency adjustment unit 162 is greater than the first intermediate frequency threshold value for the range value when the intermediate frequency signal, the gain of controlling RF front-end module 12 reduces, and makes the range value of intermediate-freuqncy signal equal the first intermediate frequency threshold value.The maximum intermediate-freuqncy signal range value that the first intermediate frequency threshold value is the analog to digital converter linear work, the first intermediate frequency threshold value can be 700mV.
As shown in Figure 5, for the fundamental diagram of the utility model for the automatic gain control module in structural representation shown in automatic gain control equipment embodiment Fig. 4 of radio-frequency transmitter, Vthrf is the radio frequency threshold value, Vthif is the first intermediate frequency threshold value, Gmax is the first maximum gain, Gmax ' is the second maximum gain, Gmax is greater than Gmax ', Gmin is the RF front-end module least gain, radiofrequency signal amplitude when V1 is intermediate-freuqncy signal amplitude arrival intermediate frequency threshold value, radiofrequency signal amplitude when Vmax is RF front-end module arrival least gain, intermediate-freuqncy signal amplitude when V2 is radiofrequency signal amplitude arrival radio frequency threshold value, V2 is less than Vthif, dotted line means that the intermediate-freuqncy signal amplitude changes with the radio frequency signal amplitude, solid line means that the RF front-end module gain changes with the radio frequency signal amplitude.Fig. 5 A is depicted as radio frequency signal frequency and the local oscillated signal frequency phase-difference is nearer, because equaling radio frequency signal frequency, the frequency of intermediate-freuqncy signal deducts the local oscillated signal frequency, so the frequency of intermediate-freuqncy signal is less, intermediate-freuqncy signal can all be passed through low pass filter substantially, amplitude fading is less, now the intermediate-freuqncy signal amplitude first arrives the first intermediate frequency threshold value Vthif, and the radiofrequency signal amplitude does not also arrive radio frequency threshold value Vthrf; When the radiofrequency signal amplitude hour, the RF front-end module gain is Gmax.Along with the increase of radiofrequency signal amplitude, the intermediate-freuqncy signal amplitude is also along with increase, until the radiofrequency signal amplitude is while arriving V1, the intermediate-freuqncy signal amplitude arrives Vthif, and the RF front-end module gain starts to reduce to keep the intermediate-freuqncy signal amplitude to maintain Vthif.When the radiofrequency signal amplitude reaches Vmax, the RF front-end module gain is reduced to Gmin.Fig. 5 B is depicted as radio frequency signal frequency and the local oscillated signal frequency phase-difference is far away, the frequency of intermediate-freuqncy signal is larger, the intermediate-freuqncy signal amplitude is low pass filtering device and decays, now the radiofrequency signal range value first arrives radio frequency threshold value Vthrf, the intermediate-freuqncy signal amplitude is only V2, also not to the first intermediate frequency threshold value Vthif; When the radiofrequency signal amplitude hour, the RF front-end module gain is Gmax.Along with the increase of radiofrequency signal amplitude, the intermediate-freuqncy signal amplitude is also along with increase, but increasing degree is less than the situation shown in Fig. 5 A.Increase along with the radiofrequency signal amplitude, the radiofrequency signal amplitude first arrives radio frequency threshold value Vthrf, the intermediate-freuqncy signal range value does not also arrive the first intermediate frequency threshold value Vthif, now the radiofrequency signal amplitude continues to increase, and just makes the RF front-end module nonlinear operation, and this is not wish situation about occurring, therefore in order to make the RF front-end module linear work, gain that just can only the limitation of radio frequency front-end module is Gmax ', and can not be Gmax, until the radiofrequency signal amplitude is increased to Vmax.Visible, the automatic gain control equipment of radio frequency reception receiver of the present utility model can be realized two kinds of functions of radio frequency peak detector and intermediate frequency peak detector simultaneously, and owing to having increased the radio frequency peak detector and having utilized the RF front-end module gain control method, can effectively eliminate when radio frequency signal frequency and local oscillated signal frequency phase-difference are far away and radiofrequency signal amplitude when larger, the interference that the harmonic wave of radiofrequency signal and the harmonic wave of local oscillated signal cause intermediate-freuqncy signal, make the RF front-end module linear work.
Alternatively, as shown in Figure 6, for second structural representation of the utility model for the automatic gain control module in structural representation shown in automatic gain control equipment embodiment Fig. 3 of radio-frequency transmitter, automatic gain control module 16 can comprise: radio frequency adjustment unit 161, the first intermediate frequency adjustment unit 162 and the second intermediate frequency adjustment unit 163, when radio frequency adjustment unit 161 is less than the radio frequency threshold value for the range value when radiofrequency signal, controlling maximum gain is the first maximum gain; When the range value of radiofrequency signal is greater than the radio frequency threshold value, controlling maximum gain is the second maximum gain, makes the range value of radiofrequency signal equal the radio frequency threshold value; The maximum radio frequency signal amplitude value that the radio frequency threshold value is RF front-end module 12 linear works, the radio frequency threshold value can be 32mV.When the first intermediate frequency adjustment unit 162 is greater than the first intermediate frequency threshold value for the range value when the intermediate frequency signal, the gain of controlling RF front-end module 12 reduces, and makes the range value of intermediate-freuqncy signal equal the first intermediate frequency threshold value; The maximum intermediate-freuqncy signal range value that the first intermediate frequency threshold value is the analog to digital converter linear work, the first intermediate frequency threshold value can be 700mV.When the second intermediate frequency adjustment unit 163 is less than the second intermediate frequency threshold value for the range value when the intermediate frequency signal, the gain of controlling RF front-end module 12 increases.The minimum intermediate-freuqncy signal range value that the second intermediate frequency threshold value is the analog to digital converter linear work, the second intermediate frequency threshold value can be 350mV.
As shown in Figure 7, for the fundamental diagram of the utility model for the automatic gain control module in structural representation shown in automatic gain control equipment embodiment Fig. 6 of radio-frequency transmitter, Vthif1 is the first intermediate frequency threshold value, Vthif2 is the second intermediate frequency threshold value, Ta, Tb can mean arbitrary time point, solid line be the intermediate-freuqncy signal amplitude over time.Now the intermediate frequency peak detector adopts sluggish detection mode, the first intermediate frequency threshold value and the second intermediate frequency threshold value are set, if make the RF front-end module linear work, just need make the amplitude of intermediate-freuqncy signal be positioned at the scope of the first intermediate frequency threshold value and the second intermediate frequency threshold value.When Ta, the intermediate-freuqncy signal amplitude is greater than the first intermediate frequency threshold value, therefore the gain that the first intermediate frequency adjustment unit will be controlled the second variable gain amplifying unit reduces 6dB, thereby makes the intermediate-freuqncy signal amplitude be reduced to just in time in the scope in the first intermediate frequency threshold value and the second intermediate frequency threshold value; While along with the time, arriving Tb, the intermediate-freuqncy signal amplitude is less than the second intermediate frequency threshold value, therefore the gain that the second intermediate frequency adjustment unit will be controlled the second variable gain amplifying unit be take 1dB and is increased gently as unit, until make the intermediate-freuqncy signal amplitude increase to just in time in the scope in the first intermediate frequency threshold value and the second intermediate frequency threshold value.As long as the intermediate-freuqncy signal amplitude, not in the scope of the first intermediate frequency threshold value and the second intermediate frequency threshold value, will be adjusted according to the intermediate frequency detection signal gain of the second variable gain amplifying unit, so that the RF front-end module linear work.Certainly, the radio frequency peak detector also can adopt this kind of sluggish detection mode, does not repeat them here.
Alternatively, then structural representation shown in Figure 3, RF front-end module 12 can comprise: the first variable gain amplifying unit 121, local oscillator 122, frequency mixer 123, low pass filter 124 and the second variable gain amplifying unit 125; The first variable gain amplifying unit 121 is connected with automatic gain control module 16, frequency mixer 123 is connected with local oscillator 122 with the first variable gain amplifying unit 121, low pass filter 124 is connected with frequency mixer 123, and the second variable gain amplifying unit 125 is connected with low pass filter 124 with automatic gain control module 16; The first variable gain amplifying unit 121 is used to radiofrequency signal to carry out the variable gain amplification and processes; Local oscillator 122 is for generating local oscillated signal; Frequency mixer 123 carries out Frequency mixing processing for radiofrequency signal and the local oscillated signal that variable gain is amplified after processing, the output intermediate-freuqncy signal; Low pass filter 124 is for carrying out the filtering processing by intermediate-freuqncy signal; The second variable gain amplifying unit 125 carries out variable gain for the intermediate-freuqncy signal by after processing and amplifies processing; Radio frequency adjustment unit 161 is for controlling the maximum gain of the first variable gain amplifying unit 121, and wherein, when the range value of radiofrequency signal is less than the radio frequency threshold value, the maximum gain of controlling the first variable gain amplifying unit 121 is the first maximum gain; When the range value of radiofrequency signal is greater than the radio frequency threshold value, the maximum gain of controlling the first variable gain amplifying unit 121 is the second maximum gain, makes the range value of radiofrequency signal equal the radio frequency threshold value; The first intermediate frequency adjustment unit 162 is for controlling the gain of the second variable gain amplifying unit 125, wherein, when the range value of intermediate frequency signal is greater than the first intermediate frequency threshold value, the gain of controlling the second variable gain amplifying unit 125 reduces, and makes the range value of intermediate-freuqncy signal equal the first intermediate frequency threshold value.
Alternatively, RF front-end module 12 can comprise: radio frequency adjustment unit 161 is for controlling the maximum gain of the first variable gain amplifying unit 121, wherein, when the range value of radiofrequency signal is less than the radio frequency threshold value, the maximum gain of controlling the first variable gain amplifying unit 121 is the first maximum gain; When the range value of radiofrequency signal is greater than the radio frequency threshold value, the maximum gain of controlling the first variable gain amplifying unit 121 is the second maximum gain, makes the range value of radiofrequency signal equal the radio frequency threshold value; The first intermediate frequency adjustment unit 162 is for controlling the gain of the second variable gain amplifying unit 125, wherein, when the range value of intermediate frequency signal is greater than the first intermediate frequency threshold value, the gain of controlling the second variable gain amplifying unit 125 reduces, and makes the range value of intermediate-freuqncy signal equal the first intermediate frequency threshold value; The second intermediate frequency adjustment unit 163 is for controlling the gain of the second variable gain amplifying unit 125, and wherein, when the range value of intermediate frequency signal is less than the second intermediate frequency threshold value, the gain of controlling the second variable gain amplifying unit 125 increases.
As shown in Figure 8, be the schematic flow sheet of the utility model for the auto gain control method embodiment of radio-frequency transmitter, the method can comprise the steps:
Step 81, RF front-end module are converted to intermediate-freuqncy signal by radiofrequency signal;
Alternatively, radiofrequency signal is by antenna reception.
Step 84, automatic gain control module are controlled the maximum gain of RF front-end module according to the range value of radiofrequency signal, control the gain of RF front-end module according to the range value of intermediate-freuqncy signal.
Alternatively, the automatic gain control module can comprise: radio frequency adjustment unit and the first intermediate frequency adjustment unit, and wherein, when the range value of radiofrequency signal is less than the radio frequency threshold value, it is the first maximum gain that the radio frequency adjustment unit is controlled maximum gain; When the range value of radiofrequency signal is greater than the radio frequency threshold value, it is the second maximum gain that the radio frequency adjustment unit is controlled maximum gain, makes the range value of radiofrequency signal equal the radio frequency threshold value; The maximum radio frequency signal amplitude value that the radio frequency threshold value is the RF front-end module linear work, the radio frequency threshold value can be 32mV.When the range value of intermediate frequency signal is greater than the first intermediate frequency threshold value, the gain that the first intermediate frequency adjustment unit is controlled RF front-end module reduces, and makes the range value of intermediate-freuqncy signal equal the first intermediate frequency threshold value; The maximum intermediate-freuqncy signal range value that the first intermediate frequency threshold value is the analog to digital converter linear work, the first intermediate frequency threshold value can be 700mV.
Alternatively, the automatic gain control module can comprise: radio frequency adjustment unit, the first intermediate frequency adjustment unit and the second intermediate frequency adjustment unit, wherein, when the range value of radiofrequency signal is less than the radio frequency threshold value, it is the first maximum gain that the radio frequency adjustment unit is controlled maximum gain; When the range value of radiofrequency signal is greater than the radio frequency threshold value, it is the second maximum gain that the radio frequency adjustment unit is controlled maximum gain, makes the range value of radiofrequency signal equal the radio frequency threshold value; When the range value of intermediate frequency signal is greater than the first intermediate frequency threshold value, the gain that the first intermediate frequency adjustment unit is controlled RF front-end module reduces, and makes the range value of intermediate-freuqncy signal equal the first intermediate frequency threshold value; When the range value of intermediate frequency signal is less than the second intermediate frequency threshold value, the gain that the second intermediate frequency adjustment unit is controlled RF front-end module increases.The minimum intermediate-freuqncy signal range value that the second intermediate frequency threshold value is the analog to digital converter linear work, the second intermediate frequency threshold value can be 350mV.
In the present embodiment, RF front-end module is converted to intermediate-freuqncy signal by radiofrequency signal, the radio frequency peak detector detects the range value of radiofrequency signal, the intermediate frequency peak detector detects the range value of intermediate-freuqncy signal, the automatic gain control module is controlled the maximum gain of RF front-end module according to the range value of radiofrequency signal, control the gain of RF front-end module according to the range value of intermediate-freuqncy signal.Utilize this method, realize that the radio frequency peak value detects and the intermediate frequency peak value detects two kinds of functions simultaneously, control the linear condition of RF front-end module gain according to intermediate frequency peak value testing result, control the maximum of RF front-end module gain according to radio frequency peak value testing result, can realize departing from the far away and radiofrequency signal amplitude of local oscillated signal frequency when larger when radio frequency signal frequency, can make the RF front-end module linear work, the interference that the harmonic wave of elimination radiofrequency signal and the harmonic wave of local oscillated signal cause intermediate-freuqncy signal.
Alternatively, RF front-end module can comprise: the first variable gain amplifying unit, local oscillator, frequency mixer, low pass filter and the second variable gain amplifying unit, the first variable gain amplifying unit is connected with the automatic gain control module, frequency mixer is connected with local oscillator with the first variable gain amplifying unit, low pass filter is connected with frequency mixer, and the second variable gain amplifying unit is connected with low pass filter with the automatic gain control module; The first variable gain amplifying unit is that radiofrequency signal is carried out variable gain amplification processing; Local oscillator generates local oscillated signal; Radiofrequency signal and local oscillated signal that frequency mixer amplifies variable gain after processing carry out Frequency mixing processing, the output intermediate-freuqncy signal; Low pass filter carries out the filtering processing by intermediate-freuqncy signal; The second variable gain amplifying unit carries out variable gain by the intermediate-freuqncy signal after processing and amplifies processing; The radio frequency adjustment unit is for controlling the maximum gain of the first variable gain amplifying unit, and wherein, when the range value of radiofrequency signal is less than the radio frequency threshold value, the maximum gain of controlling the first variable gain amplifying unit is the first maximum gain; When the range value of radiofrequency signal is greater than the radio frequency threshold value, the maximum gain of controlling the first variable gain amplifying unit is the second maximum gain, makes the range value of radiofrequency signal equal the radio frequency threshold value; The first intermediate frequency adjustment unit is for controlling the gain of the second variable gain amplifying unit, wherein, when the range value of intermediate frequency signal is greater than the first intermediate frequency threshold value, the gain of controlling the second variable gain amplifying unit reduces, and makes the range value of intermediate-freuqncy signal equal the first intermediate frequency threshold value.
Alternatively, the automatic gain control module can comprise: the radio frequency adjustment unit is for controlling the maximum gain of the first variable gain amplifying unit, wherein, when the range value of radiofrequency signal is less than the radio frequency threshold value, the maximum gain of controlling the first variable gain amplifying unit is the first maximum gain; When the range value of radiofrequency signal is greater than the radio frequency threshold value, the maximum gain of controlling the first variable gain amplifying unit is the second maximum gain, makes the range value of radiofrequency signal equal the radio frequency threshold value; The first intermediate frequency adjustment unit is for controlling the gain of the second variable gain amplifying unit, wherein, when the range value of intermediate frequency signal is greater than the first intermediate frequency threshold value, the gain of controlling the second variable gain amplifying unit reduces, and makes the range value of intermediate-freuqncy signal equal the first intermediate frequency threshold value; The second intermediate frequency adjustment unit is for controlling the gain of the second variable gain amplifying unit, and wherein, when the range value of intermediate frequency signal is less than the second intermediate frequency threshold value, the gain of controlling the second variable gain amplifying unit increases.
As shown in Figure 9, structural representation for the utility model radiofrequency receiving chip embodiment, radiofrequency receiving chip 90 can comprise: automatic gain control equipment 30, analog to digital converter 13, digital signal processor 14 and digital to analog converter 15, analog to digital converter 13 is connected with automatic gain control equipment 30, digital signal processor 14 is connected with analog to digital converter 13, and digital to analog converter 15 is connected with digital signal processor 14.Automatic gain control equipment 30 is converted to intermediate-freuqncy signal by radiofrequency signal, detect the range value of radiofrequency signal and the range value of intermediate-freuqncy signal, control the maximum gain of RF front-end module according to the range value of radiofrequency signal, control the gain of RF front-end module according to the range value of intermediate-freuqncy signal; Analog to digital converter 13 is transformed into digital medium-frequency signal by analog if signal; Digital signal processor 14 is demodulated to digital audio and video signals by digital medium-frequency signal, for example: carry out image frequency and suppress processing, frequency-selective filtering processing, demodulation process and audio frequency filtering processing; Digital to analog converter 15 is transformed into simulated audio signal by digital audio and video signals.
Automatic gain control equipment 30 can, for the automatic gain control equipment of the radio-frequency transmitter in previous embodiment, not repeat them here.
As shown in figure 10, be the structural representation of the utility model radio-frequency transmitter embodiment, this radio-frequency transmitter can comprise: antenna 11 and radiofrequency receiving chip 90, radiofrequency receiving chip 90 is connected with antenna 11.
Finally it should be noted that: above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to preferred embodiment, the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (7)
1. the automatic gain control equipment for radio-frequency transmitter, is characterized in that, comprising:
RF front-end module, for being converted to intermediate-freuqncy signal by radiofrequency signal;
The radio frequency peak detector, for detection of the range value of described radiofrequency signal;
The intermediate frequency peak detector, for detection of the range value of described intermediate-freuqncy signal;
The automatic gain control module, control the maximum gain of described RF front-end module for the range value according to described radiofrequency signal, control the gain of described RF front-end module according to the range value of described intermediate-freuqncy signal.
2. automatic gain control equipment according to claim 1, is characterized in that, described automatic gain control module comprises:
The radio frequency adjustment unit, while for the range value when described radiofrequency signal, being less than the radio frequency threshold value, controlling described maximum gain is the first maximum gain; When the range value of described radiofrequency signal is greater than described radio frequency threshold value, controlling described maximum gain is the second maximum gain, makes the range value of described radiofrequency signal equal described radio frequency threshold value;
The first intermediate frequency adjustment unit, while for the range value when described intermediate-freuqncy signal, being greater than the first intermediate frequency threshold value, the gain of controlling described RF front-end module reduces, and makes the range value of described intermediate-freuqncy signal equal described the first intermediate frequency threshold value.
3. automatic gain control equipment according to claim 2, is characterized in that, described automatic gain control module also comprises:
The second intermediate frequency adjustment unit, while for the range value when described intermediate-freuqncy signal, being less than the second intermediate frequency threshold value, the gain of controlling described RF front-end module increases.
4. automatic gain control equipment according to claim 2, is characterized in that, described RF front-end module comprises:
The first variable gain amplifying unit, be connected with described automatic gain control module, is used to described radiofrequency signal to carry out variable gain and amplifies processing;
Local oscillator, for generating local oscillated signal;
Frequency mixer, be connected with described local oscillator with described the first variable gain amplifying unit, for radiofrequency signal and the described local oscillated signal that variable gain is amplified after processing, carries out Frequency mixing processing, exports described intermediate-freuqncy signal;
Low pass filter, be connected with described frequency mixer, for described intermediate-freuqncy signal is carried out to the filtering processing;
The second variable gain amplifying unit, be connected with described low pass filter with described automatic gain control module, carries out variable gain for the intermediate-freuqncy signal by after processing and amplify processing; Described radio frequency adjustment unit is for controlling the maximum gain of described the first variable gain amplifying unit, and wherein, when the range value of described radiofrequency signal is less than the radio frequency threshold value, the maximum gain of controlling described the first variable gain amplifying unit is the first maximum gain; When the range value of described radiofrequency signal is greater than described radio frequency threshold value, the maximum gain of controlling described the first variable gain amplifying unit is the second maximum gain, makes the amplitude of described radiofrequency signal equal described radio frequency threshold value;
Described the first intermediate frequency adjustment unit is for controlling the gain of described the second variable gain amplifying unit, wherein, when the range value of described intermediate-freuqncy signal is greater than the first intermediate frequency threshold value, the gain of controlling described the second variable gain amplifying unit reduces, and makes the range value of described intermediate-freuqncy signal equal described the first intermediate frequency threshold value.
5. automatic gain control equipment according to claim 4, is characterized in that, described automatic gain control module also comprises:
The second intermediate frequency adjustment unit, for controlling the gain of described the second variable gain amplifying unit, wherein, when the range value of described intermediate-freuqncy signal is less than the second intermediate frequency threshold value, the gain of controlling described the second variable gain amplifying unit increases.
6. a radiofrequency receiving chip, comprise: automatic gain control equipment, analog to digital converter, digital signal processor and digital to analog converter, it is characterized in that, described automatic gain control equipment comprises the automatic gain control equipment of the arbitrary described radio-frequency transmitter of claim 1 to 5.
7. a radio-frequency transmitter comprises: antenna and radiofrequency receiving chip, it is characterized in that, and described radiofrequency receiving chip comprises radiofrequency receiving chip claimed in claim 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320483943 CN203368453U (en) | 2013-08-08 | 2013-08-08 | Automatic gain control device, radio frequency receiver chip and radio frequency receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320483943 CN203368453U (en) | 2013-08-08 | 2013-08-08 | Automatic gain control device, radio frequency receiver chip and radio frequency receiver |
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| CN203368453U true CN203368453U (en) | 2013-12-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915295A (en) * | 2016-05-12 | 2016-08-31 | 中国电子科技集团公司第四十研究所 | Signal gain automatic control method suitable for field intensity meter |
| CN113872540A (en) * | 2021-08-16 | 2021-12-31 | 广州润芯信息技术有限公司 | Loop automatic gain control device |
-
2013
- 2013-08-08 CN CN 201320483943 patent/CN203368453U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915295A (en) * | 2016-05-12 | 2016-08-31 | 中国电子科技集团公司第四十研究所 | Signal gain automatic control method suitable for field intensity meter |
| CN113872540A (en) * | 2021-08-16 | 2021-12-31 | 广州润芯信息技术有限公司 | Loop automatic gain control device |
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Owner name: KUNTENG MICROELECTRONIC CO., LTD. Free format text: FORMER NAME: BEIJING KUNTENG MICRO-ELECTRONICS INC. Owner name: BEIJING KUNTENG MICRO-ELECTRONICS INC. Free format text: FORMER NAME: KT MICRO, INC. |
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Address after: 100195 Haidian District, North Hollywood Road, No. 23, North Park, Central Park, building No. 4, No. Patentee after: KT MICRO, Inc. Address before: 100195 Haidian District, North Hollywood Road, No. 23, North Park, Central Park, building No. 4, No. Patentee before: Beijing Kunteng electronic Limited by Share Ltd. Address after: 100195 Haidian District, North Hollywood Road, No. 23, North Park, Central Park, building No. 4, No. Patentee after: Beijing Kunteng electronic Limited by Share Ltd. Address before: 100195 Haidian District, North Hollywood Road, No. 23, North Park, Central Park, building No. 4, No. Patentee before: KT MICRO Inc. (BEIJING) |
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Granted publication date: 20131225 |