CN1812384A - Apparatus for realizing automatic gain control in wideband wireless switch-in system terminal station - Google Patents
Apparatus for realizing automatic gain control in wideband wireless switch-in system terminal station Download PDFInfo
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Abstract
This invention discloses a kind of automatic gain control apparatus in broadband wireless switch-in system terminal station. In concludes tuner, tuner automatic gain control module, gain controlling signal generation element, prime stimulating control gain amplifier and post stimulating control gain amplifier. The tuner is arranged between prime stimulating control gain amplifier and post stimulating control gain amplifier. Post stimulating control gain amplifier is positioned in front of tuner automatic gain control module. According to signal outputted by tuner automatic gain control module, the gain controlling signal generation element can generate gain control signal which is used for controlling the gain of prime, post stimulating control gain amplifier. This invention can conveniently regulate the power of signal, which is transmitted to tuner, to the set-point. It ensures the receiver in terminal room has broad dynamic range.
Description
Technical field
The present invention relates to a kind of automatic gain control equipment, especially relate to the device of realizing automatic gain control (AGC) in a kind of wideband wireless switch-in system terminal station.
Background technology
BWA adopts the point-to-multipoint wireless transmission method, realizes that the fixed wireless integrated service between user network and the backbone network inserts.BWA is made up of base station and terminal station, and the terminal station is divided into indoor unit and outdoor unit two parts.Realize by immediate frequency cable between terminal indoor unit and the outdoor unit as shown in Figure 1 ,/intermediate frequency of downlink data is connected, protocol monitor, and remote power feeding.For the system receiver of TDMA mode, its dynamic range should be better than 40dB, and for the system receiver of DS-CDMA mode (direct sequency-code division multiple access), its dynamic range should be better than 60dB.Consider the otherness of immediate frequency cable Insertion Loss between terminal indoor unit and the outdoor unit and the fluctuation of outdoor unit receiving gain, BWA has proposed very high expectation to the dynamic range of terminal room inner receiver.Generally need be better than 50dB.The dynamic range of the broadness of end station chamber inner receiver generally realizes by the design of automatic gain control equipment in the end station chamber inner receiver circuit.
In the automatic gain control equipment of existing receiver circuit, relatively commonly used have two kinds of devices.A kind of device is to adopt one-level AGC, in this device, the demodulator of receiver circuit end produces gain control signal AGC according to the signal of input, the AGC signal is through going control and regulating TUNNER (tuner) AGC amplifier gain before after the simple LC filtering, be the gain of receiver senior middle school frequency link, make the signal power that is input to demodulator be adjusted to set point.This automatic gain control equipment is owing to adopt one-level AGC, and its control range is often limited, is difficult to satisfy the requirement of BWA to the dynamic range of terminal room inner receiver broadness.
Another kind of device then adopts two-stage AGC, in this device, the demodulator of receiver circuit end produces two-way gain control signal AGCA and AGCB according to the power of input signal, two-way AGC signal is through going control and regulating TUNNER (tuner) front and back stages AGC Amplifier Gain after the simple LC filtering, be the gain of receiver senior middle school frequency link and Low Medium Frequency link, make the signal power that is input to demodulator be adjusted to set point.Because this automatic gain control equipment has adopted the two-stage agc circuit, broad AGC scope is not difficult to realize.But make demodulator directly produce the AGC control signal that two-way has expectation control response, not a duck soup.Have different control response (slope starts to control some saturation point etc.) in order to control two-way AGC, the different threshold value of two-way AGC signal need be set.Threshold value is provided with unreasonable, is easy to cause the inefficacy of automatic gain control function.Even threshold value is provided with rationally, realized automatic gain control function, still can be very unstable near the two-stage AGC switching point.Small size vibration occurs, influence the consistency of control precision and receiver circuit performance.
Summary of the invention
The technical issues that need to address of the present invention provide the device of realizing automatic gain control in a kind of wideband wireless switch-in system terminal station, use the present invention flexibly and easily the signal power that is input to demodulator to be adjusted to set point, guarantee that the terminal room inner receiver has broad dynamic range, and can set and adjust the control response of automatic gaining controling signal flexibly and easily based on the actual application requirements.
In order to solve the problems of the technologies described above, the invention provides the device of realizing automatic gain control in a kind of wideband wireless switch-in system terminal station, include tuner, demodulator automatic gain control module, prime simulation ride gain amplifier and back level simulation ride gain amplifier, tuner is between prime simulation ride gain amplifier and back level simulation ride gain amplifier, back level simulation ride gain amplifier is positioned at before the demodulator automatic gain control module, this demodulator automatic gain control module is used to estimate the power of input signal, and the back output pulse width modulation signal of comparing with the setting power value; Described device also includes the gain control signal generation unit, this gain control signal generation unit can produce the gain control signal that is used to control the amplifier gain of forward and backward level simulation ride gain according to the output signal of the demodulator automatic gain control module that receives.
Further, the present invention also has following characteristics: described gain control signal generation unit includes filter network, the amplifier follower, the pre-amplifier automatic gaining controling signal produces circuit and the post-amplifier automatic gaining controling signal produces circuit, wherein, filter network is used for the output signal of receiving demodulation device automatic gain control module, and this signal carried out exporting the amplifier follower to after the filtering, be divided into two-way behind the signal process amplifier follower, deliver to the pre-amplifier automatic gaining controling signal respectively and produce circuit and post-amplifier automatic gaining controling signal generation circuit, produce corresponding pre-amplifier automatic gaining controling signal and post-amplifier automatic gaining controling signal.
Further, the present invention also has following characteristics: described pre-amplifier automatic gaining controling signal produces circuit and includes the resistance pressure-dividing network that the amplifier direct proportion amplifies the saturation limiting circuit and is used for the adjustment of pre-amplifier automatic gaining controling signal output amplitude, wherein the amplifier direct proportion amplifies the output signal that the reception of saturation limiting circuit comes from the amplifier follower, and, export resistance pressure-dividing network to and carry out generating the pre-amplifier automatic gaining controling signal after the amplitude adjustment after this signal amplification and going up amplitude limit.
Further, the present invention also has following characteristics: described post-amplifier automatic gaining controling signal produces circuit and includes offset generating circuit, the amplifier direct proportion amplifies negative bias compensation bottoming width of cloth circuit and is used for the resistance pressure-dividing network that post-amplifier automatic gaining controling signal output amplitude is adjusted, wherein, offset generating circuit amplifies negative bias compensation bottoming width of cloth circuit with the amplifier direct proportion and links to each other, the amplifier direct proportion amplifies negative bias compensation bottoming width of cloth circuit and receives the output signal that comes from the amplifier follower, and, export resistance pressure-dividing network to and carry out generating the post-amplifier automatic gaining controling signal after the amplitude adjustment after this signal amplification and the negative bias compensation.
Further, the present invention also has following characteristics: described filter network is for to form the LC filter network by filter resistance and filter capacitor.
Further, the present invention also has following characteristics: described amplifier direct proportion amplifies that the saturation limiting circuit comprises integrated transporting discharging, feedback resistance and the earth resistance that links to each other with this integrated transporting discharging reverse input end between the reverse input end that is connected this integrated transporting discharging and the output, and wherein the resistance of feedback resistance and earth resistance is all adjustable.
Further, the present invention also has following characteristics: the described resistance pressure-dividing network that is used for the adjustment of pre-amplifier automatic gaining controling signal output amplitude comprises signal output resistance and signal divider resistance, signal divider resistance one end ground connection wherein, a termination output; The resistance of signal output resistance and signal divider resistance is all adjustable.
Further, the present invention also has following characteristics: described offset generating circuit comprises biasing circuit integrated transporting discharging, biasing input resistance and biasing circuit earth resistance, wherein, the power supply of a termination 5V of this biasing input resistance, the other end links to each other with the integrated transporting discharging positive input; This biasing circuit earth resistance one end ground connection, the other end links to each other with the integrated transporting discharging positive input, and the resistance of biasing input resistance and biasing circuit earth resistance is all adjustable.
Further, the present invention also has following characteristics: described amplifier direct proportion amplifies negative bias compensation bottoming width of cloth circuit and comprises integrated transporting discharging, forward input resistance, forward input grounding resistance, feedback resistance and the reverse input resistance of lower limit circuit, wherein, this forward input resistance one end links to each other with the positive input of this integrated transporting discharging, and the other end connects the amplifier follower; One end of forward input grounding resistance also links to each other with the positive input of this integrated transporting discharging, and the other end is ground connection then; Feedback resistance is connected between the reverse input end and output of integrated transporting discharging; Oppositely an end of input resistance links to each other with the output of offset generating circuit, and the other end connects the reverse input end of integrated transporting discharging; The resistance of feedback resistance and the reverse input resistance of lower limit circuit is all adjustable.
Further, the present invention also has following characteristics: the described resistance pressure-dividing network that is used for the adjustment of post-amplifier automatic gaining controling signal output amplitude comprises signal output resistance and signal divider resistance, signal divider resistance one end ground connection wherein, a termination output; The resistance of signal output resistance and signal divider resistance is all adjustable.
Compared with prior art, the present invention has the following advantages:
A, because this device includes the gain control signal generation unit, this gain control signal generation unit can produce the different gain control signal of two-way according to the output signal of demodulator automatic gain control module, control the amplifier gain of forward and backward level simulation ride gain respectively, thereby the signal power that will be input to demodulator is adjusted to set point, guarantee that the terminal room inner receiver has broad dynamic range, and make each performance index of demodulator can be in optimum state;
B, circuit is simple, realizes easily, and can set and adjust the control response of automatic gaining controling signal flexibly and easily based on the actual application requirements.
Description of drawings
Fig. 1 is the overall framework figure of wideband wireless switch-in system terminal station;
Fig. 2 is the structured flowchart that includes the receiver circuit of the device of realizing automatic gain control in the wideband wireless switch-in system terminal station of the present invention;
Fig. 3 is the theory diagram of gain control signal generation unit in the device shown in Figure 2;
Fig. 4 is the instance graph of gain control signal generation unit in the device shown in Figure 2;
Fig. 5 is the example analogous diagram of gain control signal generation unit in the device shown in Figure 2.
Embodiment
For understanding the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
As shown in Figure 1, wideband wireless switch-in system terminal station is divided into indoor unit and outdoor unit two parts.Indoor unit is by the 220V mains-supplied, include Network Interface Module, main control module, MAC (medium access control) control module and base band ifd module, N * 64kbit/s the interface and the 10Base_T network interface of E1 standard (the European transfer of data universal standard) can be provided, realize functions such as network interface processing, Base-Band Processing, webmaster Telnet, wherein the base band ifd module includes transmitter circuitry and receiver circuit.And outdoor unit is realized functions such as radio-frequency receiving-transmitting, frequency conversion and filtering.Realize by immediate frequency cable between indoor unit and the outdoor unit/intermediate frequency of downlink data is connected, protocol monitor and remote power feeding.The terminal station provides 1 E1 standard N * 64kbit/s interface to be connected with user network with 1 10Base_T interface.
As shown in Figure 2, receiver circuit is made up of device and the demodulator of realizing automatic gain control in filter, the wideband wireless switch-in system terminal station.And the device of realizing automatic gain control in the wideband wireless switch-in system terminal station of the present invention includes TUNNER tuner 104, demodulator automatic gain control module 101, gain control signal generation unit 102, prime simulation ride gain amplifier 1031 and back level simulation ride gain amplifier 1032, wherein, TUNNER tuner 104 is between prime simulation ride gain amplifier 1031 and back level simulation ride gain amplifier 1032; Back level simulation ride gain amplifier 1032 is positioned at before the demodulator automatic gain control module 101; Demodulator automatic gain control module 101 output AGC signals are to gain control signal generation unit 102, and gain control signal generation unit 102 output AGCA, the AGCB signal is connected with the control end of forward and backward level simulation ride gain amplifier respectively.
The downstream signal that comes through immediate frequency cable from the terminal outdoor unit is wave apparatus at first after filtration, realizes with the separating of up signal and pilot signal, and carries out the amplitude adjustment of high-frequency signal through prime simulation ride gain amplifier 1031.TUNNER tuner 104 is realized the down-conversion of downstream signals, and descending low frequency signal is simulated a ride gain amplifier 1032 through the back level and carried out entering demodulator after the amplitude adjustment; The demodulator automatic gain control module 101 that is arranged in demodulator is used to estimate the power of input signal, and the back output pulse width modulation signal (being the AGC signal) of comparing with the setting power value; This gain control signal generation unit 102 produces the gain control signal AGCA and the AGCB that are used to control the amplifier gain of forward and backward level simulation ride gain according to the AGC signal of demodulator automatic gain control module 101 outputs.
As shown in Figure 3, Figure 4, gain control signal generation unit 102 includes filter network 1021, amplifier follower 1022 among the present invention, the pre-amplifier automatic gaining controling signal produces circuit and the post-amplifier automatic gaining controling signal produces circuit, wherein, filter network is formed the LC filter network by filter resistance R1 and filter capacitor C1, the AGC signal that is used for the output of receiving demodulation device automatic gain control module, and this AGC signal carried out exporting amplifier follower 1022 to after the filtering, output AGC signal is realized the isolation with the prime circuit behind amplifier follower 1022; Be divided into two-way behind this AGC signal process amplifier follower 1022, deliver to the pre-amplifier automatic gaining controling signal respectively and produce circuit and post-amplifier automatic gaining controling signal generation circuit, produce corresponding pre-amplifier automatic gaining controling signal AGCA and post-amplifier automatic gaining controling signal AGCB.
The pre-amplifier automatic gaining controling signal produces circuit and amplifies saturation limiting circuit 1023 by the amplifier direct proportion and be used for the resistance pressure-dividing network 1024 that pre-amplifier automatic gaining controling signal output amplitude adjusts and forms, wherein amplifier direct proportion amplification saturation limiting circuit 1023 by integrated transporting discharging, be connected the reverse input end of this integrated transporting discharging and form with the earth resistance R4 that links to each other with this integrated transporting discharging reverse input end with circuit feedback resistance R3 between the output; 1024 of resistance pressure-dividing networks are formed this signal divider resistance R13 one end ground connection, a termination output by signal output resistance R14 and signal divider resistance R13; The resistance of signal output resistance R14 and signal divider resistance is all adjustable.
The amplifier direct proportion amplifies saturation limiting circuit 1023 and receives the output signal that comes from amplifier follower 1022, this signal is carried out ratio to be amplified, and the saturation characteristic of utilizing amplifier realizes the last amplitude limit of signal, export resistance pressure-dividing network 1024 then to, carry out generating pre-amplifier automatic gaining controling signal AGCA after the amplitude adjustment.
According to circuit diagram shown in Figure 4, can obtain the relation between the AGC signal of pre-amplifier automatic gaining controling signal AGCA and input, be shown below
VAGCA＝((R3+R4)/R4*VAGC)*R13/(R13+R14)
VAGCAmax＝Vsat*R13/(R13+R14)
Wherein, VAGC is a voltage of signals after the AGC process LC filtering, and VAGCA is the AGCA signal voltage, and VAGCAmax is the last amplitude limit of VAGCA, and Vsat is the saturation voltage of integrated transporting discharging.From formula, as can be known, the value of VAGCAmax can be adjusted, the response slope of VAGCA can be adjusted by the value of adjusting R3, R4 by the resistance of adjusting R13, R14.
The post-amplifier automatic gaining controling signal produces circuit and amplifies negative bias compensation bottoming width of cloth circuit 1025 by offset generating circuit 1026, amplifier direct proportion and be used for the resistance pressure-dividing network 1027 that post-amplifier automatic gaining controling signal output amplitude adjusts and form.
Wherein, offset generating circuit 1026 is made up of biasing circuit integrated transporting discharging, biasing input resistance R5 and biasing circuit earth resistance R6, the power supply of the termination 5V of biasing input resistance R5, and the other end links to each other with the integrated transporting discharging positive input; This biasing circuit earth resistance R6 one end ground connection, the other end links to each other with the integrated transporting discharging positive input, and the resistance of this biasing input resistance R5 and biasing circuit earth resistance R6 is all adjustable;
The amplifier direct proportion amplifies negative bias compensation bottoming width of cloth circuit 1025 and comprises integrated transporting discharging, forward input resistance R7, forward input grounding resistance R 8, feedback resistance R10 and reverse input resistance R9, wherein, the end of this forward input resistance R7 links to each other with the positive input of this integrated transporting discharging, and the other end connects the output of amplifier follower 1022; One end of forward input grounding resistance R 8 also links to each other with the positive input of this integrated transporting discharging, and the other end is ground connection then; Lower limit circuit feedback resistance R10 is connected between the reverse input end and output of integrated transporting discharging; The end of the reverse input resistance R9 of lower limit circuit links to each other with the output of offset generating circuit 1026, and the other end connects the reverse input end of integrated transporting discharging; The resistance of lower limit circuit feedback resistance R10 and the reverse input resistance R9 of lower limit circuit is all adjustable.
Resistance pressure-dividing network 1027 is by signal output resistance R11 and signal divider resistance R12, signal divider resistance R12 one end ground connection wherein, a termination output; The resistance of signal output resistance R11 and signal divider resistance R12 is all adjustable.
The amplifier direct proportion amplifies negative bias compensation bottoming width of cloth circuit 1025 and receives the output signal that comes from amplifier follower 1022, and with after this signal proportion amplification and the negative bias compensation, utilize the unipolarity characteristic of amplifier to realize the following amplitude limit of signal, and export resistance pressure-dividing network 1027 generation post-amplifier automatic gaining controling signal AGCB to.
According to circuit diagram shown in Figure 4, can obtain the relation between the AGC signal of post-amplifier automatic gaining controling signal AGCB and input, be shown below
VAGCB＝((R8/(R7+R8)*VAGC)*(R9+R10)/R9
-(R6/(R5+R6)*VCC)*R10/R9)*R12/(R11+R12)
VAGCBmax＝Vsat*R12/(R11+R12)
Wherein, VAGC is a voltage of signals after the AGC process LC filtering, and VAGCB is the AGCB signal voltage, and VAGCBmax is the last amplitude limit of VAGCB, and Vsat is the saturation voltage of integrated transporting discharging.From formula, as can be known, the value of VAGCBmax can be adjusted, the response slope of VAGCB can be adjusted by the value of adjusting R5, R6, R9, R10 by the resistance of adjusting R11, R12.
Find out from analogous diagram shown in Figure 5, in the residing application of this example, simulation ride gain amplifier unit is made up of prime simulation ride gain amplifier 1031 that is used for senior middle school's frequency link gain reduction and the back level simulation ride gain amplifier 1032 that is used for the amplification of Low Medium Frequency link gain, the attenuation of prime simulation ride gain amplifier 1031 is inversely proportional to analog control voltage AGCA, the gain of back level simulation ride gain amplifier 1032 is directly proportional with analog control voltage AGCA, in addition, the AGC signal voltage of automatic gain control module 101 outputs is inversely proportional to input signal power in the demodulator.
As shown in Figure 5, when input power was normal level, VAGC equaled Vch, and this moment, VAGCA output was maximum, and VAGCB exports minimum, and whole link is in normal gain.Input signal power behind automatic gain control equipment is adjusted to the demodulator requirement and sets level.
When input power when normal level increases, VAGC reduces, VAGCA begins to reduce, VAGCB keeps minimum constant.Prime simulation ride gain amplifier 1031 begins to start to control, and its decay becomes big, and the gain of receiver link diminishes, and applied signal voltage is attenuated to the demodulator requirement and sets level behind receiver circuit; When power output when normal level reduces, VAGC increases, VAGCB begins to increase, VAGCA keeps maximum constant.Back level simulation ride gain amplifier 1032 begins to start to control, and its gain becomes big, and the gain of receiver link becomes big, and applied signal voltage is amplified to the demodulator requirement and sets level behind receiver circuit.
When input power was in maximum power, the gain of prime simulation ride gain amplifier 1031 was in minimum (decay is maximum), and 1032 gains of back level simulation ride gain amplifier are in minimum, and whole receiver circuit is in least gain (decay is maximum).When input power from maximum power when minimum power reduces, prime simulation ride gain amplifier 1031 starts to control earlier, its gain increases (decay reduces), whole receiver circuit gain increases (decay reduces).When power reduced to normal level, the gain of prime simulation ride gain amplifier 1031 reached maximum (decay is minimum), and whole receiver circuit is in normal gain.When power further reduced, back level simulation ride gain amplifier 1032 started to control, its increase that gains, and whole receiver circuit gain increases.When power reduced to minimum levels, the gain of back level simulation ride gain amplifier 1032 reached maximum, and whole receiver circuit is in maximum gain.
The present invention is arranged in the receiver circuit of terminal station indoor unit base band ifd module, in the course of the work, import the into downstream signal of indoor unit from the terminal outdoor unit and through immediate frequency cable, realize the device of automatic gain control after filtration in wave apparatus and the wideband wireless switch-in system terminal station of the present invention, the signal power that is input to demodulator at last is in a suitable set point, under this signal power value, each performance index of demodulator all can be in optimum state, and the control response of AGC (response curve slope, amplitude limit in the output, two-stage AGC switching point) also can set easily and flexibly based on the actual application requirements and adjust.
Claims (10)
1, realize the device of automatic gain control in a kind of wideband wireless switch-in system terminal station, include tuner, demodulator automatic gain control module, prime simulation ride gain amplifier and back level simulation ride gain amplifier, tuner is between prime simulation ride gain amplifier and back level simulation ride gain amplifier, back level simulation ride gain amplifier is positioned at before the demodulator automatic gain control module, this demodulator automatic gain control module is used to estimate the power of input signal, and the back output pulse width modulation signal of comparing with the setting power value, it is characterized in that: described device also includes the gain control signal generation unit, this gain control signal generation unit can be according to the output signal of the demodulator automatic gain control module that receives, before generation is used for control, the gain control signal of back level simulation ride gain amplifier gain.
2, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 1, it is characterized in that: described gain control signal generation unit includes filter network, the amplifier follower, the pre-amplifier automatic gaining controling signal produces circuit and the post-amplifier automatic gaining controling signal produces circuit, wherein, filter network is used for the output signal of receiving demodulation device automatic gain control module, and this signal carried out exporting the amplifier follower to after the filtering, be divided into two-way behind the signal process amplifier follower, deliver to the pre-amplifier automatic gaining controling signal respectively and produce circuit and post-amplifier automatic gaining controling signal generation circuit, produce corresponding pre-amplifier automatic gaining controling signal and post-amplifier automatic gaining controling signal.
3, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 2, it is characterized in that: described pre-amplifier automatic gaining controling signal produces circuit and includes the resistance pressure-dividing network that the amplifier direct proportion amplifies the saturation limiting circuit and is used for the adjustment of pre-amplifier automatic gaining controling signal output amplitude, wherein the amplifier direct proportion amplifies the output signal that the reception of saturation limiting circuit comes from the amplifier follower, and with after this signal amplification and going up amplitude limit, export resistance pressure-dividing network to and carry out the amplitude adjustment, generate the pre-amplifier automatic gaining controling signal at last.
4, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 2, it is characterized in that: described post-amplifier automatic gaining controling signal produces circuit and includes offset generating circuit, the amplifier direct proportion amplifies negative bias compensation bottoming width of cloth circuit and is used for the resistance pressure-dividing network that post-amplifier automatic gaining controling signal output amplitude is adjusted, wherein, offset generating circuit amplifies negative bias compensation bottoming width of cloth circuit with the amplifier direct proportion and links to each other, the amplifier direct proportion amplifies negative bias compensation bottoming width of cloth circuit and receives the output signal that comes from the amplifier follower, and with after this signal amplification and the negative bias compensation, export resistance pressure-dividing network to and carry out the amplitude adjustment, generate the post-amplifier automatic gaining controling signal at last.
5, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 2, it is characterized in that: described filter network is for to form the LC filter network by filter resistance and filter capacitor.
6, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 3, it is characterized in that: described amplifier direct proportion amplifies that the saturation limiting circuit comprises integrated transporting discharging, amplitude limiter circuit feedback resistance and the earth resistance that links to each other with this integrated transporting discharging reverse input end between the reverse input end that is connected this integrated transporting discharging and the output, and wherein the resistance of feedback resistance and earth resistance is all adjustable.
7, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 3, it is characterized in that: the described resistance pressure-dividing network that is used for the adjustment of pre-amplifier automatic gaining controling signal output amplitude comprises signal output resistance and signal divider resistance, signal divider resistance one end ground connection wherein, a termination output; The resistance of signal output resistance and prime signal divider resistance is all adjustable.
8, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 4, it is characterized in that: described offset generating circuit comprises biasing circuit integrated transporting discharging, biasing input resistance and biasing circuit earth resistance, wherein, the power supply of one termination 5V of this biasing input resistance, the other end links to each other with the integrated transporting discharging positive input; This biasing circuit earth resistance one end ground connection, the other end links to each other with the integrated transporting discharging positive input, and the resistance of biasing input resistance and biasing circuit earth resistance is all adjustable.
9, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 8, it is characterized in that: described amplifier direct proportion amplifies negative bias compensation bottoming width of cloth circuit and comprises integrated transporting discharging, forward input resistance, forward input grounding resistance, feedback resistance and reverse input resistance, wherein, this forward input resistance one end links to each other with the positive input of this integrated transporting discharging, and the other end connects the amplifier follower; One end of forward input grounding resistance also links to each other with the positive input of this integrated transporting discharging, and the other end is ground connection then; Feedback resistance is connected between the reverse input end and output of integrated transporting discharging; Oppositely an end of input resistance links to each other with the output of offset generating circuit, and the other end connects the reverse input end of integrated transporting discharging; The resistance of feedback resistance and the reverse input resistance of lower limit circuit is all adjustable.
10, realize the device of automatic gain control in the wideband wireless switch-in system terminal station according to claim 9, it is characterized in that: the described resistance pressure-dividing network that is used for the adjustment of post-amplifier automatic gaining controling signal output amplitude comprises signal output resistance and signal divider resistance, signal divider resistance one end ground connection wherein, a termination output; The signal output resistance is all adjustable with the resistance of back level signal divider resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100029087A CN100561994C (en) | 2005-01-26 | 2005-01-26 | Realize the device of automatic gain control in the wideband wireless switch-in system terminal station |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100029087A CN100561994C (en) | 2005-01-26 | 2005-01-26 | Realize the device of automatic gain control in the wideband wireless switch-in system terminal station |
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| CN1812384A true CN1812384A (en) | 2006-08-02 |
| CN100561994C CN100561994C (en) | 2009-11-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195583A (en) * | 2011-05-24 | 2011-09-21 | 中兴通讯股份有限公司 | Device and method for controlling gain of transimpedance amplifier of lithium niobate (LiNbO3) modulator |
| CN111211750A (en) * | 2020-02-25 | 2020-05-29 | 广芯电子技术（上海）股份有限公司 | Automatic gain control circuit and method for controlling gain regulation speed in AGC system |
| CN117807937A (en) * | 2024-03-01 | 2024-04-02 | 成都鹰谷米特科技有限公司 | Pulse photoelectric detection pre-amplifying circuit digital-analog hybrid integrated circuit chip and device |
-
2005
- 2005-01-26 CN CNB2005100029087A patent/CN100561994C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102195583A (en) * | 2011-05-24 | 2011-09-21 | 中兴通讯股份有限公司 | Device and method for controlling gain of transimpedance amplifier of lithium niobate (LiNbO3) modulator |
| CN102195583B (en) * | 2011-05-24 | 2016-01-20 | 中兴通讯股份有限公司 | A kind of lithium niobate modulator trans-impedance amplifier gain control and method |
| CN111211750A (en) * | 2020-02-25 | 2020-05-29 | 广芯电子技术（上海）股份有限公司 | Automatic gain control circuit and method for controlling gain regulation speed in AGC system |
| CN111211750B (en) * | 2020-02-25 | 2023-06-09 | 广芯电子技术（上海）股份有限公司 | Automatic gain control circuit and method for controlling gain adjustment speed in AGC system |
| CN117807937A (en) * | 2024-03-01 | 2024-04-02 | 成都鹰谷米特科技有限公司 | Pulse photoelectric detection pre-amplifying circuit digital-analog hybrid integrated circuit chip and device |
| CN117807937B (en) * | 2024-03-01 | 2024-05-24 | 成都鹰谷米特科技有限公司 | Pulse photoelectric detection pre-amplifying circuit digital-analog hybrid integrated circuit chip and device |
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| Publication number | Publication date |
|---|---|
| CN100561994C (en) | 2009-11-18 |
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