CN208548882U - A kind of small-sized Direct Conversion wide band radio-frequency reception system - Google Patents
A kind of small-sized Direct Conversion wide band radio-frequency reception system Download PDFInfo
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Abstract
The utility model relates to a kind of small-sized Direct Conversion wide band radio-frequencies to receive system, by using harmonic mixing technology, direct current negative-feedback technology --- the Miller integrated transporting discharging component with inelastic region metal-oxide-semiconductor self-calibration function, feed forward type gain and phase corrective network technology based on second-order differential feedback element, effectively solve the problems, such as the intrinsic direct current offset of Direct Conversion structure, second order intermodulation distortion and I/Q Channel Mismatch, system is received to which Direct Conversion structure is successfully applied to wide band radio-frequency, realizes its miniaturization, standardization and high reusable degree.It has broad application prospects.
Description
Technical field
The utility model relates to a kind of frequency conversion wide band radio-frequencies to receive system.
Background technique
Traditional wide band radio-frequency receives the Topology Structure Design that system uses superheterodyne receiver, can provide sufficiently high
Receiving sensitivity and frequency selectivity, but the intrinsic image frequency of superheterodyne receiver inhibits to select what is mutually restricted to ask with neighboring trace
Topic can only smoothly be filtered with conversion system secondary or more than two times by increasing larger-size image-reject filter and IF
Wave device solves, this undoubtedly makes the complexity of receiver circuit, size, component number, power consumption all very high.Direct Conversion connects
Receipts machine use with the identical local frequency of radiofrequency signal, radiofrequency signal is directly transformed to base band, there is no image frequency inhibit
Problem, entire circuit can be realized in the form of component or mmic chip in monolithic printed board, therefore the circuits such as size, complexity
Design objective all significantly reduces, and the wide band radio-frequency receiving front-end realized in a manner of Direct Conversion, due to increasing system collection
The reusable degree of Cheng Du, circuit are largely increased, therefore have broad application prospects.
But wide band radio-frequency using the above structure, which receives system, need to solve direct current offset, intermodulation distortion and I, Q Channel Mismatch
Etc. the intrinsic technological deficiency beneficial effect of Direct Conversions mode.
Utility model content
The mixing of radio-frequency receiving system usually all use the orthogonal mixing schemes of I, Q binary channels, and broadband mixing general side
Method is to use the frequency mixer of multiple frequency range concurrent workings to cover wider frequency band, to realize that broadband is straight on single frequency mixer
Mixing is connect, current method is to use harmonic mixing, i.e., defeated with the higher hamonic wave signal and high frequency of the local oscillation signal of a low frequency
Enter signal to be mixed, be moved downwards to complete frequency spectrum.But it is inclined that harmonic wave direct conversion mode can be inevitably present direct current
Shifting problem, in order to solve the above technical problems, the utility model provides a kind of small-sized Direct Conversion wide band radio-frequency reception system, packet
It includes:
First bandpass filter, input terminal are connected with radio frequency input, obtain and receive signal；Low-noise amplifier, it is defeated
Enter end to be connected with the output of first bandpass filter；Coupled capacitor, input terminal and the low-noise amplifier
Output end connection；First orthogonal mixer, input terminal are connect with the output end of the coupled capacitor；First direct current negative-feedback
Amplifier, input terminal are connect with the output of first orthogonal mixer；Second bandpass filter, input terminal with it is described
The first direct current reversed feedback amplifier output connection；Second direct current reversed feedback amplifier, input terminal and second band
The output of bandpass filter connects；First digital analog converter, the output of input terminal and the first direct current reversed feedback amplifier
Connection；Digital information processing system, I path input are connect with the output end of first digital analog converter；Frequency is closed
It grows up to be a useful person, generates local oscillation signal；Frequency multiplier, input terminal are connect with the output end of the frequency synthesizer；Second orthogonal mixing
Device, input terminal are connect with the output end of the coupled capacitor；Third direct current reversed feedback amplifier, input terminal and described
The output of second orthogonal mixer connects；Third bandpass filter, input terminal and the third direct current reversed feedback amplifier
Output connection；4th direct current reversed feedback amplifier, input terminal are connect with the output of the third bandpass filter；Second
Digital analog converter, input terminal are connect with the output of the 4th direct current reversed feedback amplifier；Digital information processing system,
Q path input is connect with the output end of second digital analog converter；Switch, input terminal are defeated with the frequency multiplier
Outlet connection；Its output end is connected to the input terminal of first orthogonal mixer and the input terminal of the second orthogonal mixer.
Further, the digital signal processor, I channel output end are defeated with the first direct current reversed feedback amplifier
Enter connection, while being connect with the input of the second direct current reversed feedback amplifier；Digital signal processor, Q channel output end and
The input of three direct current reversed feedback amplifiers connects, while connecting with the input of the 4th direct current reversed feedback amplifier.
Further, the orthogonal mixer, comprising: the output end of first capacitor its input terminal and the coupled capacitor
Connection；First barrier Schottky diode, anode are connect with the output end of the first capacitor, cathode and second band
The input terminal of bandpass filter connects；Its input terminal of second capacitor is connect with the output end of the coupled capacitor；Second potential barrier Xiao Te
Based diode, cathode are connect with the output end of second capacitor, the input terminal of anode and second bandpass filter
Connection；The I channel output end of quadrature phase shifter, input terminal and digital information processing system, the output end of first capacitor and
The anode connection of one barrier Schottky diode；The output end and the second potential barrier of quadrature phase shifter, output end and the second capacitor
The cathode of Schottky diode connects.
As described above, direct current reversed feedback amplifier includes: Miller operational amplifier, and anode input connection is described orthogonal
The output end of frequency mixer；Its pole P of metal-oxide-semiconductor and the input of the first Miller operational amplifier cathode connect；Its input terminal of biasing resistor with
The output end of Miller operational amplifier connects, and output end is connected to ground；Miller operational amplifier, anode input described in connection
MOS pipe the pole N and be connected to ground, cathode input connects the output of the biasing resistor, and output is connected to metal-oxide-semiconductor
Gate input.
Beneficial effect
The Direct Conversion wide band radio-frequency that above-mentioned utility model technology provides a kind of miniaturization receives the implementation method of system,
Orthogonal mixer, Multiband hondover switch, with bandpass filter, low-noise amplifier, direct current negative-feedback amplification are completed in chip-scale
The repertoire of the critical components such as device has structure tight to reduce LO (local oscillator) leakage bring direct current offset effect
Gather, function admirable the characteristics of.
Detailed description of the invention
Fig. 1；Circuit system structural block diagram is received for a kind of small-sized Direct Conversion wide band radio-frequency
Fig. 2；For the short base line interference antenna array structural block diagram of the utility model quaternary
Fig. 3；For the utility model dipole antenna configuration block diagram
Fig. 4；For the utility model orthogonal mixer internal structure block diagram
Fig. 5；For the utility model direct current reversed feedback amplifier circuit structure block diagram
Fig. 6；For the Miller operational amplifier configuration block diagram in the utility model direct current reversed feedback amplifier
Fig. 7；The control of I/Q channel gain and corrective network circuit structure frame for the utility model digital information processing system
Figure
Specific embodiment
Transmission signal is transmitted to the small-sized Direct Conversion of the utility model by antenna element by radio frequency reception Channel Elements
Wide band radio-frequency receives system.
Wherein antenna element be the short base line interference antenna array of quaternary, antenna array array element by 4 fixed distance aparts dipole
Sub-antenna composition, as shown in Figure 2.Wherein, first left antenna is benchmark antenna in figure, is arranged successively as first antenna, the
Two antennas and third antenna.It is that first antenna is from reference antenna 300mm, the second antenna distance benchmark day that it, which arranges fixed range,
Line 660mmm, third antenna is apart from reference antenna 1200mm.Each antenna structure is as shown in Figure 3.
A kind of small-sized Direct Conversion wide band radio-frequency of the utility model receives system, as shown in Figure 1, comprising:
First bandpass filter 101, input terminal are connected with radio frequency input, obtain and receive signal；Low-noise amplifier
(102), input terminal is connected with the output of first bandpass filter (101)；Coupled capacitor (103), input terminal with
The output end of the low-noise amplifier (102) connects；First orthogonal mixer (104), input terminal and the coupling
The output end of capacitor (103) connects；First direct current reversed feedback amplifier (105), input terminal mixing orthogonal with described first
The output of device (104) connects；Second bandpass filter (106), input terminal and the first direct current reversed feedback amplifier
(105) output connection；Second direct current reversed feedback amplifier (107), input terminal and second bandpass filter (106)
Output connection；First digital analog converter (108), input terminal are defeated with the second direct current reversed feedback amplifier (107)
It connects out；Digital information processing system (117), the output end of I path input and first digital analog converter (108)
Connection；Frequency synthesizer (109) generates local oscillation signal；Frequency multiplier (110), input terminal and the frequency synthesizer (109)
Output end connection；
Second orthogonal mixer (111), input terminal are connect with the output end of the coupled capacitor (103)；Third is straight
It flows reversed feedback amplifier (113), input terminal is connect with the output of second orthogonal mixer (111)；The filter of third band logical
Wave device (114), input terminal are connect with the output of the third direct current reversed feedback amplifier (113)；4th direct current negative-feedback
Amplifier (115), input terminal are connect with the output of the third bandpass filter (114)；Second digital analog converter
(116), input terminal is connect with the output of the 4th direct current reversed feedback amplifier (115)；Digital information processing system
(117), Q path input is connect with the output end of second digital analog converter (116)；It switchs (112), input terminal
It is connect with the output end of the frequency multiplier (110)；Its output end is connected to the defeated of first orthogonal mixer (104)
Enter the input terminal of end and the second orthogonal mixer (111).
Further, the digital information processing system (117), I channel output end are put with the first direct current negative-feedback
The input connection of big device (105), while being connect with the input of the second direct current reversed feedback amplifier (107)；Digital Signal Processing system
It unites (117), Q channel output end is connect with the input of third direct current reversed feedback amplifier (113), while negative with the 4th direct current
The input of feedback amplifier (115) connects.
Wherein Multiband hondover switch (112) uses the IPN00587-SPIN electronic switch of SYMON company, Germany,
Single switching time≤10us, standing-wave ratio≤1.2.Multiband with bandpass filter (101), (106) (114) are difficult to understand public using Chengdu day
The TDF2490-BRCAC microstrip type radio-frequency filter of department, insertion loss≤0.6dB, stopband attenuation >=60dB.
Multiband low-noise amplifier (102) uses monolithic mmic chip, and chip model is U.S.'s Maxim
MAX2675, noise coefficient are only 1dB, full frequency band gain >=20dB.ADC chip selects the double channel A/D 9625 of ADI company, should
Device sample rate is 2.5GSPS, quantization digit 18bit.What digital information processing system chip DSP (117) was selected is TI company
TMS320C6414TBZLZA8, the SDRAM of plug-in 64Mb, be mainly used to realize the control of command analysis and I, Q Channel Mismatch
System and calibration function.
It is inclined that orthogonal mixer (109), (118) are mainly used for the intrinsic self-mixing bring direct current of solution Direct Conversion structure
Shifting problem.Radiofrequency signal is divided into two, and the input terminal of two Schottky diodes is respectively coupled to by respective capacitance,
And (output of local oscillation signal direct synthesizer+frequency multiplier), the bias amount as two Schottky diodes access two poles
Manage respective input terminal.The output end of two diodes formed as a result, is the two-way Direct Conversion baseband signal after being mixed.Electricity
Road is using the MSPD2018 phase detection type harmonic mixing device assembly of AEROFLEX company, Holland, and internal circuit configuration block diagram is such as
Shown in Fig. 4.Device --- barrier Schottky diode power consumption is very low for the mixing of its core, is microwatt magnitude, therefore intermediate frequency leakage
And heat dissipation all very littles, convenient for the miniaturization of entire printed circuit board.
First orthogonal mixer (104), comprising: first capacitor (201), input terminal and the coupled capacitor
(103) output end connection；First barrier Schottky diode (202), the output of anode and the first capacitor (201)
End connection, cathode are connect with the input terminal of second bandpass filter (106)；Second capacitor (203), input terminal and institute
State the output end connection of coupled capacitor (103)；Second barrier Schottky diode (204), cathode and second capacitor
(203) output end connection, anode are connect with the input terminal of second bandpass filter (106)；Quadrature phase shifter
(205), the I channel output end of input terminal and digital information processing system (117), the output end of first capacitor (201) and the
The anode connection of one barrier Schottky diode (202)；Quadrature phase shifter (205), output end are defeated with the second capacitor (203)
The connection of the cathode of outlet and the second barrier Schottky diode (204).
Second orthogonal mixer (111), comprising: first capacitor (301), input terminal and the coupled capacitor
(103) output end connection；First barrier Schottky diode (302), the output of anode and the first capacitor (301)
End connection, cathode are connect with the input terminal of the third bandpass filter (114)；Second capacitor (303), input terminal and institute
State the output end connection of coupled capacitor (103)；Second barrier Schottky diode (304), cathode and second capacitor
(303) output end connection, anode are connect with the input terminal of the third bandpass filter (114)；Quadrature phase shifter
(305), the Q channel output end of input terminal and digital information processing system (117), the output end of first capacitor (301) and the
The anode connection of one barrier Schottky diode (302)；Quadrature phase shifter (305), output end are defeated with the second capacitor (303)
The connection of the cathode of outlet and the second barrier Schottky diode (304).
Direct current reversed feedback amplifier (105) (107) (113) (115) includes Miller integrated transporting discharging component (a pair), inside
Circuit structure diagram is as shown in figure 5, chip model is the MT5990-RCX2014 of TaiWan, China Yun Sheng company, direct current negative-feedback amplification
The main function of device is to effectively improve second order input section IIP2, so that Direct Conversion structure bring second order inter-modulation be overcome to lose
Very.
In order to further increase second order input section level, band inelastic region metal-oxide-semiconductor is used certainly in direct current negative-feedback circuit
The Miller integrated transporting discharging component of calibration function, wherein forming work by the bias voltage of reasonably preset two pairs of four groups of metal-oxide-semiconductors
Extremely low drain-source current in inelastic region, and the drain-source current and drain-source voltage (very high bias voltage over the ground) are linear
Relationship, therefore equivalent circuit internal resistance out will show high value.A pair of of Miller integrated operational amplifier, by metal-oxide-semiconductor drain-source electricity
The containing of pressure, Miller effect --- node capacitor expands as G times of coupled capacitor for generation, and circuit externally shows high capacitor value.
Huge inhibiting effect can be presented to second order intermodulation distortion (low frequency offset amount) in this high resistant of amplifier, capacitance, by frequency mixer
Output end low-pass filtering, the negative-feedback signal after detecting the low frequency offset amount, as drain-source voltage, so that it may realize to the low frequency
The dynamic closed-loop control of offset, the i.e. self-calibration function of second order intermodulation distortion, this self calibration feedback loop can be effectively suppressed
Low frequency offset caused by second order intermodulation distortion.
The first direct current reversed feedback amplifier (105) includes: Miller operational amplifier (401), and anode input connects
Connect the output end of first orthogonal mixer (104)；Metal-oxide-semiconductor (404), the pole P and Miller operational amplifier (401) cathode are defeated
Enter connection；Biasing resistor (402), input terminal are connect with the output end of Miller operational amplifier (401), and output end and ground are even
It connects；Miller operational amplifier (403), the pole N of the anode input connection metal-oxide-semiconductor (404) are simultaneously connected to ground, and cathode is defeated
Enter the output for connecting the biasing resistor (402), output is connected to the gate input of metal-oxide-semiconductor (404).
The second direct current reversed feedback amplifier (107) includes: Miller operational amplifier (501), and anode input connects
Connect the output end of second bandpass filter (106)；Metal-oxide-semiconductor (504), the pole P and Miller operational amplifier (501) cathode are defeated
Enter connection；Biasing resistor (502), input terminal are connect with the output end of Miller operational amplifier (501), and output end and ground are even
It connects；Miller operational amplifier (503), the pole N of the anode input connection metal-oxide-semiconductor (504) are simultaneously connected to ground, and cathode is defeated
Enter the output for connecting the biasing resistor (502), output is connected to the gate input of metal-oxide-semiconductor (504).
The third direct current reversed feedback amplifier (113) includes: Miller operational amplifier (601), and anode input connects
Connect the output end of second orthogonal mixer (111)；Metal-oxide-semiconductor (604), the pole P and Miller operational amplifier (601) cathode are defeated
Enter connection；Biasing resistor (602), input terminal are connect with the output end of Miller operational amplifier (601), and output end and ground are even
It connects；Miller operational amplifier (603), the pole N of the anode input connection metal-oxide-semiconductor (604) are simultaneously connected to ground, and cathode is defeated
Enter the output for connecting the biasing resistor (602), output is connected to the gate input of metal-oxide-semiconductor (604).
The 4th direct current reversed feedback amplifier (115) includes: Miller operational amplifier (701), and anode input connects
Connect the output end of the third bandpass filter (114)；Metal-oxide-semiconductor (704), the pole P and Miller operational amplifier (701) cathode are defeated
Enter connection；Biasing resistor (702), input terminal are connect with the output end of Miller operational amplifier (701), and output end and ground are even
It connects；Miller operational amplifier (703), the pole N of the anode input connection metal-oxide-semiconductor (704) are simultaneously connected to ground, and cathode is defeated
Enter the output for connecting the biasing resistor (702), output is connected to the gate input of metal-oxide-semiconductor (704).
The Miller integrated transporting discharging component (a pair) of direct current reversed feedback amplifier (105) (107) (113) (115) is using with non-
Linear zone metal-oxide-semiconductor self-calibration function, internal circuit structure chart is as shown in fig. 6, chip model is TaiWan, China Yun Sheng company
MT5990-RCX2014, the main function of direct current reversed feedback amplifier is to effectively improve second order input section IIP2, to overcome
Direct Conversion structure bring second order intermodulation distortion.
In order to eliminate the amplitude and phase mismatch of I/Q interchannel, also specially devised in printed board anti-based on second-order differential
The feed forward type gain control of feedback link and corrective network, circuit inner structure figure are as shown in Figure 7.In digital signal processor DSP
In specially devise the channel I/Q control and correcting circuit, by I/Q channel signal amplitude compared with phase, formed error
Signal recycles a second-order differential feedback element, extracts the variable quantity of error signal velocity and acceleration, as adjusting two-stage
The feedforward pumping signal of baseband amplifier can rapidly correct the amplitude and phase mismatch of I/Q interchannel.
In addition to the implementation, the utility model further includes having other embodiments, all to use equivalents or equivalent
The technical solution that alternative is formed, should all fall within the protection scope of the utility model claims.
Claims (8)
1. a kind of small-sized Direct Conversion wide band radio-frequency receives system (100), which is characterized in that the system includes:
First bandpass filter (101), input terminal are connected with radio frequency input, obtain and receive signal；
Low-noise amplifier (102), input terminal are connected with the output of first bandpass filter (101)；
Coupled capacitor (103), input terminal are connect with the output end of the low-noise amplifier (102)；
First orthogonal mixer (104), input terminal are connect with the output end of the coupled capacitor (103)；
First direct current reversed feedback amplifier (105), input terminal are connect with the output of first orthogonal mixer (104)；
Second bandpass filter (106), input terminal are connect with the output of the first direct current reversed feedback amplifier (105)；
Second direct current reversed feedback amplifier (107), input terminal are connect with the output of second bandpass filter (106)；
First digital analog converter (108), input terminal are connect with the output of the second direct current reversed feedback amplifier (107)；
The output end of digital information processing system (117), I path input and first digital analog converter (108) connects
It connects；
Frequency synthesizer (109) generates local oscillation signal；
Frequency multiplier (110), input terminal are connect with the output end of the frequency synthesizer (109)；
Second orthogonal mixer (111), input terminal are connect with the output end of the coupled capacitor (103)；
Third direct current reversed feedback amplifier (113), input terminal are connect with the output of second orthogonal mixer (111)；
Third bandpass filter (114), input terminal are connect with the output of the third direct current reversed feedback amplifier (113)；
4th direct current reversed feedback amplifier (115), input terminal are connect with the output of the third bandpass filter (114)；
Second digital analog converter (116), input terminal are connect with the output of the 4th direct current reversed feedback amplifier (115)；
The output end of digital information processing system (117), Q path input and second digital analog converter (116) connects
It connects；
It switchs (112), input terminal is connect with the output end of the frequency multiplier (110)；Its output end is connected to described the
The input terminal of one orthogonal mixer (104) and the input terminal of the second orthogonal mixer (111).
2. a kind of small-sized Direct Conversion wide band radio-frequency according to claim 1 receives system (100), which is characterized in that institute
The digital information processing system (117) stated, I channel output end are connect with the input of the first direct current reversed feedback amplifier (105),
It is connect simultaneously with the input of the second direct current reversed feedback amplifier (107)；Digital information processing system (117), Q channel output end
It connect with the input of third direct current reversed feedback amplifier (113), while connecting with the input of the 4th direct current reversed feedback amplifier (115)
It connects.
3. a kind of small-sized Direct Conversion wide band radio-frequency according to claim 1 receives system (100), which is characterized in that institute
The first orthogonal mixer (104) stated, comprising:
First capacitor (201), input terminal are connect with the output end of the coupled capacitor (103)；
First barrier Schottky diode (202), anode connect with the output end of the first capacitor (201), cathode and
The input terminal of second bandpass filter (106) connects；
Second capacitor (203), input terminal are connect with the output end of the coupled capacitor (103)；
Second barrier Schottky diode (204), cathode are connect with the output end of second capacitor (203), anode with
The input terminal of second bandpass filter (106) connects；
Quadrature phase shifter (205), I channel output end, the first capacitor of input terminal and digital information processing system (117)
(201) the anode connection of output end and the first barrier Schottky diode (202)；
The output end and the second barrier Schottky diode of quadrature phase shifter (205), output end and the second capacitor (203)
(204) cathode connection.
4. a kind of small-sized Direct Conversion wide band radio-frequency according to claim 1 receives system (100), which is characterized in that institute
The second orthogonal mixer (111) stated, comprising:
First capacitor (301), input terminal are connect with the output end of the coupled capacitor (103)；
First barrier Schottky diode (302), anode connect with the output end of the first capacitor (301), cathode and
The input terminal of the third bandpass filter (114) connects；
Second capacitor (303), input terminal are connect with the output end of the coupled capacitor (103)；
Second barrier Schottky diode (304), cathode are connect with the output end of second capacitor (303), anode with
The input terminal of the third bandpass filter (114) connects；
Quadrature phase shifter (305), Q channel output end, the first capacitor of input terminal and digital information processing system (117)
(301) the anode connection of output end and the first barrier Schottky diode (302)；
The output end and the second barrier Schottky diode of quadrature phase shifter (305), output end and the second capacitor (303)
(304) cathode connection.
5. a kind of small-sized Direct Conversion wide band radio-frequency according to claim 1 receives system (100), which is characterized in that institute
The the first direct current reversed feedback amplifier (105) stated includes:
Miller operational amplifier (401), anode input connect the output end of first orthogonal mixer (104)；
Metal-oxide-semiconductor (404), the pole P and the input of Miller operational amplifier (401) cathode connect；
Biasing resistor (402), input terminal are connect with the output end of Miller operational amplifier (401), and output end is connected to ground；
Miller operational amplifier (403), the pole N of the anode input connection metal-oxide-semiconductor (404) are simultaneously connected to ground, cathode
Input connects the output of the biasing resistor (402), and output is connected to the gate input of metal-oxide-semiconductor (404).
6. a kind of small-sized Direct Conversion wide band radio-frequency according to claim 1 receives system (100), which is characterized in that institute
The the second direct current reversed feedback amplifier (107) stated includes:
Miller operational amplifier (501), anode input connect the output end of second bandpass filter (106)；
Metal-oxide-semiconductor (504), the pole P and the input of Miller operational amplifier (501) cathode connect；
Biasing resistor (502), input terminal are connect with the output end of Miller operational amplifier (501), and output end is connected to ground；
Miller operational amplifier (503), the pole N of the anode input connection metal-oxide-semiconductor (504) are simultaneously connected to ground, cathode
Input connects the output of the biasing resistor (502), and output is connected to the gate input of metal-oxide-semiconductor (504).
7. a kind of small-sized Direct Conversion wide band radio-frequency according to claim 1 receives system (100), which is characterized in that institute
The third direct current reversed feedback amplifier (113) stated includes:
Miller operational amplifier (601), anode input connect the output end of second orthogonal mixer (111)；
Metal-oxide-semiconductor (604), the pole P and the input of Miller operational amplifier (601) cathode connect；
Biasing resistor (602), input terminal are connect with the output end of Miller operational amplifier (601), and output end is connected to ground；
Miller operational amplifier (603), the pole N of the anode input connection metal-oxide-semiconductor (604) are simultaneously connected to ground, cathode
Input connects the output of the biasing resistor (602), and output is connected to the gate input of metal-oxide-semiconductor (604).
8. a kind of small-sized Direct Conversion wide band radio-frequency according to claim 1 receives system (100), which is characterized in that institute
The 4th direct current reversed feedback amplifier (115) stated includes:
Miller operational amplifier (701), anode input connect the output end of the third bandpass filter (114)；
Metal-oxide-semiconductor (704), the pole P and the input of Miller operational amplifier (701) cathode connect；
Biasing resistor (702), input terminal are connect with the output end of Miller operational amplifier (701), and output end is connected to ground；
Miller operational amplifier (703), the pole N of the anode input connection metal-oxide-semiconductor (704) are simultaneously connected to ground, cathode
Input connects the output of the biasing resistor (702), and output is connected to the gate input of metal-oxide-semiconductor (704).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566218A (en) * | 2018-06-04 | 2018-09-21 | 中国卫星海上测控部 | A kind of small-sized Direct Conversion wide band radio-frequency reception system |
| CN110912571A (en) * | 2019-10-29 | 2020-03-24 | 芯创智（北京）微电子有限公司 | Receiver circuit with ultra-low power consumption |
-
2018
- 2018-06-04 CN CN201820861172.1U patent/CN208548882U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108566218A (en) * | 2018-06-04 | 2018-09-21 | 中国卫星海上测控部 | A kind of small-sized Direct Conversion wide band radio-frequency reception system |
| CN110912571A (en) * | 2019-10-29 | 2020-03-24 | 芯创智（北京）微电子有限公司 | Receiver circuit with ultra-low power consumption |
| CN110912571B (en) * | 2019-10-29 | 2022-02-22 | 芯创智（北京）微电子有限公司 | Receiver circuit with ultra-low power consumption |
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