CN208572042U - A kind of spaceborne miniaturization analog predistortion device - Google Patents
A kind of spaceborne miniaturization analog predistortion device Download PDFInfo
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- CN208572042U CN208572042U CN201821208854.9U CN201821208854U CN208572042U CN 208572042 U CN208572042 U CN 208572042U CN 201821208854 U CN201821208854 U CN 201821208854U CN 208572042 U CN208572042 U CN 208572042U
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- diode
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- delayed phase
- spaceborne
- predistorter
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Abstract
The utility model provides a kind of spaceborne miniaturization analog predistortion device, and using mode transmission structure, two-stage Schottky diode parallel connection is placed, by the way that reasonable bias working point is arranged, builds periphery match circuit.Predistorter shows the characteristic of gain expansion and delayed phase with the increase of input power, and circuit realizes that structure is simple, small in size, can be integrated with existing circuit processing techniques, realizes the miniaturization of circuit.The length for connecting the microstrip line of two diodes should meet the integral multiple of half-wavelength, to realize the superposition of gain extension and delayed phase degree.It is respectively connected in parallel with a capacitor beside each diode, by changing the capacitance of capacitor, the delayed phase characteristic of adjustable predistorter.The biasing resistor of diode supply lines realizes the adjusting to diode turn-on voltage, by changing the resistance value, the operating point that control predistorter changes with input power, while the amplitude of adjustable gain expansion and delayed phase.
Description
Technical field
The utility model relates to a kind of predistorters, and in particular to a kind of spaceborne miniaturization analog predistortion device.
Background technique
Business microsatellite proposes very high requirement to the volume and power consumption of its TTC channel, it is desirable that TT&C Transponder has
Low-power consumption, miniaturization, feature easy of integration.Therefore, to improve power-efficient, satellite Overall Power Consumption, TTC channel transmitting are reduced
The power amplifier of channel end is usually operated at close to saturation state, to improve working efficiency, reduces Overall Power Consumption.It defends simultaneously
Star TTC & DT Systems have generallyd use the digital modulation modes such as BPSK, QPSK, these digital modulation modes usually require that power
The amplifier linearity with higher to reduce the bit error rate of data transmission, and does not interfere the communication of microsatellite adjacent channel
Work.
Utility model content
The utility model devises a kind of analog predistortion device that can adapt in microsatellite TT&C system, it is desirable that its electricity
Road has the characteristics that structure is simple, low in energy consumption, small in size, the power amplifier cascade of the predistorter and transmission channel end
Afterwards, it can effectively improve crosstalk of the power amplifier at saturation power, improve the linearity of power amplifier.
The technical solution of the utility model is as follows:
1, analog predistortion device uses mode transmission structure, and two-stage Schottky diode parallel connection is placed, reasonable by being arranged
Bias working point, build periphery match circuit.Predistorter shows gain expansion and phase with the increase of input power
The characteristic of lag, circuit realizes that structure is simple, small in size, can be integrated with existing circuit processing techniques, realizes the small of circuit
Type.
2, the analog predistortion device connects the length of the microstrip line of two diodes by the way of two-stage diodes in parallel
The integral multiple of the half-wavelength of center operating frequency should be met, to realize the superposition of gain extension and delayed phase degree；
3, for can delayed phase degree to predistorter realize and individually adjust, each in parallel one beside each diode
A capacitor, by changing the capacitance of capacitor, in the case where not influencing predistorter gain, the phase of adjustable predistorter
Hysteresis characteristic；
4, the biasing resistor of diode supply lines realizes the adjusting to diode turn-on voltage, by changing the resistance value,
The operating point that control predistorter changes with input power, while the amplitude of adjustable gain expansion and delayed phase.
The circuit of the utility model has the advantages that structure is simple, small in size, low in energy consumption, especially suitable for micro-thermoelectric generator
The transmission channel of TT&C Transponder improves nonlinear characteristic of the power amplifier at saturation power.
Detailed description of the invention
Fig. 1 is the circuit diagram of the spaceborne miniaturization analog predistortion device of the present invention.
Specific embodiment
The analog predistortion device of the utility model is to construct circuit structure appropriate using diode as predistorter,
Near suitable bias point, its gain and phase are controlled with the variation characteristic of input power, structure is simple and easy to implement, volume
It is small and low in energy consumption, current microsatellite communication system is very suitable to the demand for development of circuit miniaturization and low-power consumption.The simulation
After predistorter and the cascade of the power amplifier of satellite TT&C system transmitter end, can have in the case where not influencing power amplification efficiency
Effect reduces non-linear distortion of the power amplifier at saturation power, improves the linear of power amplifier.It is practical new to this now in conjunction with embodiment, attached drawing
Type is further described:
Fig. 1 is the circuit diagram of the spaceborne miniaturization analog predistortion device of the present invention.C0Indicate capacitance, capacitance is preferably
100~1000pF prevents DC voltage from influencing the input and output port of signal.C1It indicates adjusting capacitor in parallel, changes electricity
The capacitance of appearance can individually adjust the degree of analog predistortion device delayed phase, and capacitance is preferably 0.5~20pF.
+VccIndicate that supply voltage, voltage value are preferably arranged to 3~8V, provide supply voltage appropriate, R table for diode
Show biasing resistor, resistance value is preferably set to 1K~10K ohm, to change the bias voltage of diode, influences its transmission characteristic.
Z0Indicate the characteristic impedance of microstrip line, for realizing the impedance matching of front stage, l indicates that the physics of microstrip line is long
Front stage Diode gain expansion width may be implemented when its physical length is the integral multiple of center working frequency half-wavelength in degree
The superposition of degree and delayed phase.
Diode1 and Diode2 is using Schottky diode, using Schottky diode under particular bias voltage in Fig. 1
Nonlinear characteristic, with the increase of input power, Schottky diode predistorter can show gain expansion and phase steric retardation
Characteristic afterwards.
Big signal input power Pin(Vin) when, the electric current of diode will appear peak clipping, and distorted signals can generate DC operation
Electric current Ir, change the quiescent point of diode.The electric current I of diode operation point at this timedLAnd VdLIt can indicate are as follows:
IdL=Ir+f(VdL) (4)
VdL=VCC-R·Ir-R·f(VdL) (5)
The then equivalent resistance R of diode at this timedIt indicates are as follows:
The scattering parameter S of its two-port can be found out using Microwave Net method21:
Then its amplitude are as follows:
Phase are as follows:
The propagation characteristic of mode transmission diode predistorter, amplitude | S21| and phase ∠ S21With input power Pin(Vin)
Variation can state are as follows:
It can be seen that predistorter shows the characteristic of gain expansion and delayed phase with the increase of input power, it can
To be used to supplement distortion of the power amplifier at saturation power, the linearity of power amplifier is improved.
The spaceborne miniaturization analog predistortion device circuit of the utility model uses the biasing networks of single supply, this single supply
Feeding classification structure is simple, small in size, realizes convenient for miniaturization Integrated design.
It should be noted that only the present invention is schematically illustrated and illustrated above, those skilled in the art is answered
When understanding, protection scope of the present invention is belonged to any modification of the invention and replacement.
Claims (4)
1. a kind of spaceborne miniaturization analog predistortion device, which is characterized in that two-stage diodes in parallel connects, between two diodes
It is connected with microstrip line, each adjusting capacitor in parallel beside each diode adjusts the capacitance of capacitor by changing, and adjusts pre- lose
The delayed phase characteristic of true device, supply voltage adjust the conducting voltage of diode by biasing resistor, and microstrip line both ends respectively connect
One capacitance prevents DC voltage from influencing the input and output port of predistorter.
2. a kind of spaceborne miniaturization analog predistortion device as described in claim 1, which is characterized in that the length of the microstrip line
For the integral multiple of half-wavelength, to realize the superposition of two-stage Diode gain extension and delayed phase.
3. a kind of spaceborne miniaturization analog predistortion device as described in claim 1, which is characterized in that pass through setting diode
Bias working point realizes the characteristic of two-stage Diode gain extension and delayed phase using the nonlinear characteristic of diode.
4. a kind of spaceborne miniaturization analog predistortion device as described in claim 1, which is characterized in that by adjusting biasing resistor
Resistance value, the operating point that changes with input power of control predistorter, while adjusting the amplitude of gain expansion and delayed phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821208854.9U CN208572042U (en) | 2018-07-28 | 2018-07-28 | A kind of spaceborne miniaturization analog predistortion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821208854.9U CN208572042U (en) | 2018-07-28 | 2018-07-28 | A kind of spaceborne miniaturization analog predistortion device |
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| CN208572042U true CN208572042U (en) | 2019-03-01 |
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| CN201821208854.9U Active CN208572042U (en) | 2018-07-28 | 2018-07-28 | A kind of spaceborne miniaturization analog predistortion device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677132A (en) * | 2019-09-05 | 2020-01-10 | 广州穗源微电子科技有限公司 | Radio frequency linear power amplifier circuit |
| CN112968675A (en) * | 2021-01-28 | 2021-06-15 | 重庆邮电大学 | Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line |
-
2018
- 2018-07-28 CN CN201821208854.9U patent/CN208572042U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677132A (en) * | 2019-09-05 | 2020-01-10 | 广州穗源微电子科技有限公司 | Radio frequency linear power amplifier circuit |
| CN110677132B (en) * | 2019-09-05 | 2020-09-25 | 广州穗源微电子科技有限公司 | Radio frequency linear power amplifier circuit |
| CN112968675A (en) * | 2021-01-28 | 2021-06-15 | 重庆邮电大学 | Pre-distortion Doherty power amplifier based on variable capacitance diode loading composite left-right-hand transmission line |
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