CN201307848Y - Radio frequency automatic level control circuit - Google Patents
Radio frequency automatic level control circuit Download PDFInfo
- Publication number
- CN201307848Y CN201307848Y CNU2008202152954U CN200820215295U CN201307848Y CN 201307848 Y CN201307848 Y CN 201307848Y CN U2008202152954 U CNU2008202152954 U CN U2008202152954U CN 200820215295 U CN200820215295 U CN 200820215295U CN 201307848 Y CN201307848 Y CN 201307848Y
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- Prior art keywords
- amplifier
- radio frequency
- circuit
- attenuator
- level control
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Abstract
The utility model discloses a radio frequency system automatic level control circuit, in particular to a circuit with rather large adjustability of radio frequency signal gain, which comprises a power amplifier, a comparison/operational amplifier and a coupler, and an adjustable attenuator is also connected between the power amplifier and the coupler. A power detector is connected between the comparison/operational amplifier and the coupler. Radio frequency signals are sent to the adjustable attenuator by the power amplifier, and then the signals are output to the next level of circuit of the system. An output port of a comparison circuit does not determine the gain of the power amplifier, but determines the decrement of the attenuator. Because the circuit adopts the fixed amplifier gain (fixed amplifier bias voltage), and the adjustability of radio frequency signals can be realized by adjusting the decrement of the attenuator, the problem that the whole radio frequency (microwave) communication system breaks down caused by potential burning phenomenon of the amplifier in the automatic level control circuit is solved to a certain degree. Normal working points of amplifier elements can be ensured, the potential burning possibility can be avoided, and the adjustable range of ideal signal quantity can also be reached.
Description
Technical field
The utility model relates to a kind of radio system automatic level control circuit, more particularly relates to have about the radiofrequency signal amount of gain circuit of big adjustability.
Background technology
Whether in RF application the inside, effective control of signal gain size is important to what close for a system, can receive and specify the signal power of size to guarantee its operate as normal because it is related to the next stage circuit.Existing main flow automatic gain control case in, all be to realize the adjustability that gains by the bias voltage of direct resonance-amplifier.Because in the amplifier normal range of operation, the changed scope of the bias voltage of amplifier is smaller, so it is also just smaller to change the adjustable extent of Amplifier Gain amount, and change the working point and bring potential distortion can for the amplification performance of amplifier and burn, thereby cause whole radio frequency (microwave) communication system to be in the danger of potential collapse.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of radiofrequency signal gain and has more wide adjustable range, and effectively solves the potential distortion of amplifier and burn the radio frequency automatic level control circuit of phenomenon.
Technical scheme: to achieve these goals, radio frequency automatic level control circuit provided by the invention comprises power amplifier, comparison/operational amplifier, and coupling apparatus also is connected with adjustable attenuator between power amplifier and coupling apparatus.
Be connected with power detector between comparison/operational amplifier and the coupling apparatus.
Beneficial effect: radiofrequency signal enters this circuit by the power amplifier input port, and signal is admitted to adjustable attenuator behind power amplifier, then signal output is delivered to the next stage circuit of system.The output port of comparison circuit does not determine the amount of gain of power amplifier, but the attenuation of decision attenuator.Because this circuit adopted fixedly amplifier gain (fixedly amplifier biasing voltage), realized the resizability of radiofrequency signal by the regulated attenuator attenuation, overcome to a certain extent because of amplifier in the automatic level control circuit potential and burnt the crash issue that phenomenon causes whole radio frequency (microwave) communication system.Both guarantee the amplifier element normal working point, avoided the potential possibility of burning, reached the adjustable extent of more satisfactory signal magnitude again.
Description of drawings
Fig. 1 is existing RF application automatic electric-level control mainstream technology circuit block diagram;
Fig. 2 is an automatic level control circuit block diagram of the present invention;
Fig. 3 is the circuit diagram of adjustable attenuator among the present invention.
PA-power amplifier, OP-comparison/operational amplifier, PWR DETECTOR-power detector, COUPLER-coupling circuit; VARIABLE ATTENUATOR-adjustable attenuator,
The HSMP3814-PIN diode
Embodiment
Below in conjunction with accompanying drawing particular content of the present utility model is described further.
With reference to Fig. 1: in the circuit block diagram of existing RF application automatic electric-level control mainstream technology, radiofrequency signal enters amplifier from power amplifier PA input A, and signal amplifies after power amplifier PA output port B directly is sent to next stage coupling apparatus COUPLER.Part signal closes end D to power detector PWR DETECTOR through the lotus root of coupling apparatus COUPLER, convert magnitude of voltage to through power detector PWR DETECTOR, be input to comparison/operational amplifier OP, compare with extraneous input voltage F, again the gain that comes regulatory work rate amplifier PA through the output port G of the comparison/operational amplifier OP bias voltage by regulatory work rate amplifier PA.When this circulation reaches balance, the C of coupling apparatus COUPLER end then output finally through amplifying signal.
With reference to Fig. 2: in the automatic level control circuit block diagram of the present invention, the difference part of the present invention and main flow automatic electric-level control technology is to have added adjustable attenuator VARIABLE behind power amplifier PA
ATTENUATOR。Signal is through the input A ingoing power amplifier PA of power amplifier PA, radiofrequency signal after B end output is sent to after the adjustable attenuator VARIABLE ATTENUATOR, delivers to next stage coupling circuit COUPLER again from the output H of adjustable attenuator VARIABLE ATTENUATOR.Part signal closes end D to power detector PWRDETECTOR through the lotus root of coupling apparatus COUPLER, convert magnitude of voltage to through power detector PWR DETECTOR, be input to comparison/operational amplifier OP, compare with extraneous input voltage F, again through the output port G of comparison/operational amplifier OP by regulating the attenuation of adjustable attenuator VARIABLE ATTENUATOR, reach gain controlling with this to entire circuit.After reaching balance at last, hold then output signal by the C of coupling apparatus COUPLER.In this scheme,, therefore the range of choice of relative broad is arranged also when selecting amplifier element because of not needing to consider whether power amplifier PA has bigger bias voltage scope.
With reference to Fig. 3: the present invention utilizes the resistance of PIN diode under radio frequency to be changed this characteristic by changing bias current.We select the HSMP-3814PIN diode of Agilent science and technology to be used as attenuating elements.Because they have low-down distortion, and only need less bias current, so than being more suitable for the frequency microwave communication system.Signal from the left side or the right input IN-OUT end enter, be the attenuator that HSMP3814 does through two diode CR1 and CR2 then, at last by the right or left side output IN-OUT output.The extraneous variable voltage of VCC by the variation of its magnitude of voltage, and changes the pad value that two diode CR1 and CR2 are the attenuator done of HSMP3814.3.3V be that supply diode CR1 and CR2 are the fixed-bias transistor circuit of HSMP3814.When design balance formula attenuator, adopt the resistance R 2 of double-tube series replacement π type attenuator, R3.Because the maximum isolation degree of network is by the parasitic capacitance C2 and the C3 decision of two series diodes, with two diode CR1 and CR2 is that HSMP3814 replaces a diode can improve attenuation or the operating frequency upper limit is doubled, and the series resistance of duo-diode has 180 degree phase differences, can offset the even distortion, resistance R 1, resistance R 4, resistance R 5, resistance R 6 is as the build-out resistor of diode, suitably select its parameter, can be in big dynamic attenuation range series connection and bypass diode provide correct biasing and shunting, the impedance matching that whole network acquisition is forged a good relationship.
Claims (2)
1, a kind of radio frequency automatic level control circuit comprises power amplifier, comparison/operational amplifier, and coupling apparatus is characterized in that: also be connected with adjustable attenuator between power amplifier and coupling apparatus.
2, radio frequency automatic level control circuit according to claim 1 is characterized in that: be connected with power detector between comparison/operational amplifier and the coupling apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202152954U CN201307848Y (en) | 2008-12-09 | 2008-12-09 | Radio frequency automatic level control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202152954U CN201307848Y (en) | 2008-12-09 | 2008-12-09 | Radio frequency automatic level control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201307848Y true CN201307848Y (en) | 2009-09-09 |
Family
ID=41100314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202152954U Expired - Fee Related CN201307848Y (en) | 2008-12-09 | 2008-12-09 | Radio frequency automatic level control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201307848Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340286A (en) * | 2010-07-16 | 2012-02-01 | 东莞理工学院 | Method for realizing ALC (Adaptive Logic Circuit) control |
| CN103208972A (en) * | 2012-01-12 | 2013-07-17 | 上海创远仪器技术股份有限公司 | Wide-band amplifier circuit with controllable gain and high flatness |
| CN106411343A (en) * | 2016-11-15 | 2017-02-15 | 中国电子科技集团公司第四十研究所 | Direct sampling based receiver RF front-end processing circuit and receiver |
-
2008
- 2008-12-09 CN CNU2008202152954U patent/CN201307848Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340286A (en) * | 2010-07-16 | 2012-02-01 | 东莞理工学院 | Method for realizing ALC (Adaptive Logic Circuit) control |
| CN103208972A (en) * | 2012-01-12 | 2013-07-17 | 上海创远仪器技术股份有限公司 | Wide-band amplifier circuit with controllable gain and high flatness |
| CN106411343A (en) * | 2016-11-15 | 2017-02-15 | 中国电子科技集团公司第四十研究所 | Direct sampling based receiver RF front-end processing circuit and receiver |
| CN106411343B (en) * | 2016-11-15 | 2019-04-02 | 中国电子科技集团公司第四十一研究所 | It is a kind of based on the receiver radio frequency front-end processing circuit directly sampled and receiver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090909 Termination date: 20131209 |