CN100559706C - Radio-frequency differential-to-single-ended converter - Google Patents
Radio-frequency differential-to-single-ended converter Download PDFInfo
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- CN100559706C CN100559706C CNB2006101165539A CN200610116553A CN100559706C CN 100559706 C CN100559706 C CN 100559706C CN B2006101165539 A CNB2006101165539 A CN B2006101165539A CN 200610116553 A CN200610116553 A CN 200610116553A CN 100559706 C CN100559706 C CN 100559706C
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Abstract
The invention discloses a kind of radio-frequency differential-to-single-ended converter, the basic pattern of this transducer is divided into two kinds on N type and P type, realizes with N transistor npn npn and P transistor npn npn respectively.N type and P type converter incorporates constitute the push-pull type radio-frequency differential-to-single-ended converter; Wherein, the output of described N type transducer and P type transducer is ac-coupled to output end vo by capacitor C 1 and C2 respectively; Import sharedly, promptly the transistor M4 of the transistor M1 of N type transducer and P type transducer uses same input Vi+, and the transistor M3 of the transistor M2 of N type transducer and P type transducer uses same input Vi-; Form the push-pull type radio-frequency differential-to-single-ended converter.Operating frequency range of the present invention is wide, and additional gain can be provided, the efficient height, and the two differential circuits load balancing, the linearity is good, is easy on chip integrated.
Description
Technical field
The present invention relates to a kind of radio circuit, particularly relate to a kind of radio-frequency differential-to-single-ended converter.
Background technology
The afterbody of transmitter generally is a power amplifier, and its output certain power is transmitted into the space then to antenna.The power amplifier of main flow mostly adopts single-ended input form at present, and the circuit before the power amplifier adopts difference form usually, to improve the noise ability that suppresses.Therefore need before power amplifier, insert a differential-to-single-ended converter.
Two kinds of differential-to-single-ended conversion methods of main at present use:
A kind of Ba Lun of being to use (balun) is merged into differential signal single-ended.Its shortcoming is: differential loss is big, and the circuit of realization takies bigger area, is not easy on chip integrated.
Another kind method is directly to get a road in the difference input (other a tunnel is unsettled, need not).Its shortcoming is, gain loss 6dB, and efficient is low, and the two-way load characteristic is unbalanced.
Summary of the invention
Technical problem to be solved by this invention provides a kind of radio-frequency differential-to-single-ended converter, and operating frequency range is wide, power loss is little, efficient is high, two differential circuits load balancing, the linearity are good, it is integrated to be easy on chip.
For solving the problems of the technologies described above, the technical scheme that radio-frequency differential-to-single-ended converter of the present invention adopted is: N type radio-frequency differential-to-single-ended converter and P type radio-frequency differential-to-single-ended converter by parallel connection are formed, and are connected between power supply and the ground wire;
The output of described N type radio-frequency differential-to-single-ended converter and P type radio-frequency differential-to-single-ended converter is ac-coupled to output end vo by first capacitor C 1 and second capacitor C 2 respectively; Import shared, be that the first transistor M1 of N type radio-frequency differential-to-single-ended converter and the 4th transistor M4 of P type radio-frequency differential-to-single-ended converter use same differential input signal anode Vi+, the 3rd transistor M3 of the transistor seconds M2 of N type radio-frequency differential-to-single-ended converter and P type radio-frequency differential-to-single-ended converter uses same differential input signal negative terminal Vi-; Form the push-pull type radio-frequency differential-to-single-ended converter.
Adopt radio-frequency differential-to-single-ended converter of the present invention, can make the operating frequency range of signal wide, power loss is little, efficient is high, two differential circuits load balancing, the linearity are good; And have and be easy to advantage integrated on chip.
Owing to there is source follower, output impedance is low, and bandwidth is big, can make the operating frequency range of signal wide.And the narrow often passband of the working range of Ba Lun.
Power loss is little, efficient is high.Owing to there is common-source amplifier, itself have the effect of power amplification, and source follower and the shared electric current of common-source amplifier, improved efficient.And often there is the power attenuation of 2-3dB in Ba Lun, directly gets one tunnel power attenuation that 6dB more arranged.
The two differential circuits load balancing.By transistorized size match, it is balanced preferably that the two differential circuits load can reach.Directly get one the tunnel and then make the two-way load imbalance, reduced inhibition ability common-mode noise.
The linearity is good.Owing to recommend characteristic, provide bigger amplitude of oscillation space to output voltage, make it have good linearty.
Be easy on chip integrated.The present invention only uses transistor and electric capacity, integratedly on chip only takies very little area; And on chip integrated Ba Lun, on the one hand can take very big area, the differential loss of Ba Lun can be very big on the other hand, efficient is low.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and Examples:
Fig. 1 is the circuit diagram of N type radio-frequency differential-to-single-ended converter of the present invention;
Fig. 2 is the circuit diagram of P type radio-frequency differential-to-single-ended converter of the present invention;
Fig. 3 is the circuit diagram of push-pull type radio-frequency differential-to-single-ended converter of the present invention
Fig. 4 is the circuit diagram of the present invention's improved push-pull type radio-frequency differential-to-single-ended converter on Fig. 3 basis.
Embodiment
Referring to Fig. 1, N type radio-frequency differential-to-single-ended converter of the present invention comprises that two N transistor npn npns are the first transistor M1 and transistor seconds M2, the drain electrode interconnection of the source electrode of the first transistor M1 and transistor seconds M2 is as output end vo, the drain electrode of the first transistor M1 connects power supply, the source ground line of transistor seconds M2, differential input signal anode Vi+ is input to the grid of the first transistor M1 by AC coupled (having omitted dc bias circuit among the figure), and differential input signal negative terminal Vi-is input to the grid of transistor seconds M2 by AC coupled.
The first transistor M1 constitutes source follower, and output end vo is followed differential input signal anode Vi+ in the same way.Transistor seconds M2 constitutes common-source amplifier, and Vi-oppositely amplifies with the differential input signal negative terminal.Because Vi+ and Vi-are reverse, the output of source follower and common-source amplifier is in the same way so, and both can directly merge, and finish differential-to-single-ended translation function.
Common-source amplifier makes transducer have certain gain.Source follower has less output impedance, so transducer has the operating frequency range of broad.By transistorized size match, it is balanced preferably that the two differential circuits load can reach.In addition, this transducer also have efficient height, the linearity good, be easy to advantage such as integrated on chip.
Fig. 2 is the circuit diagram of P type radio-frequency differential-to-single-ended converter of the present invention.It comprises two P transistor npn npns i.e. the 3rd transistor M3 and the 4th transistor M4, the source electrode interconnection of the drain electrode of the first transistor M1 and transistor seconds M2 is as output end vo, the source electrode of the 3rd transistor M3 connects power supply, the grounded drain line of the 4th transistor M4, differential input signal anode Vi+ is input to the grid of the 4th transistor M4 by AC coupled (having omitted dc bias circuit among the figure), and differential input signal negative terminal Vi-is input to the grid of the 3rd transistor M3 by AC coupled.
Corresponding with circuit shown in Figure 1, the 4th transistor M4 constitutes source follower, and transistor the 3rd M3 constitutes common-source amplifier.
On Fig. 1,2 basis, can form the push-pull type radio-frequency differential-to-single-ended converter.Referring to Fig. 3, it is made up of the N type radio-frequency differential-to-single-ended converter (hereinafter to be referred as N type transducer) and the P type radio-frequency differential-to-single-ended converter (hereinafter to be referred as P type transducer) of parallel connection, is connected between power supply and the ground wire.
The output of described N type transducer and P type transducer is ac-coupled to output end vo by first capacitor C 1 and second capacitor C 2 respectively; Import shared, be that the first transistor M1 of N type transducer and the 4th transistor M4 of P type transducer use same differential input signal anode Vi+, the 3rd transistor M3 of the transistor seconds M2 of N type transducer and P type transducer uses same differential input signal negative terminal Vi-.
The first transistor M1 and the 4th transistor M4 constitute source follower respectively, are coupled to output end vo by ac coupling capacitor (C1 and C2) respectively, and output end vo is followed differential input signal anode Vi+ in the same way.Transistor seconds M2 and the 3rd transistor M3 constitute common-source amplifier respectively, are coupled to output end vo by ac coupling capacitor (C1 and C2) respectively, and Vi-oppositely amplifies with the differential input signal negative terminal.Because Vi+ and Vi-are reverse, the output of source follower and common-source amplifier is in the same way so, and both can directly merge, and finish differential-to-single-ended translation function.
As shown in Figure 4, on the basis of Fig. 3, described push-pull type radio-frequency differential-to-single-ended converter is further improved, increase P type the 5th a transistor M5 and N type the 6th a transistor M6; The source electrode of described P type the 5th transistor M5 connects power supply, the gate interconnection of the 3rd transistor M3 of grid and described P type transducer, and draining is connected with the output that connects N type transducer; The source ground line of N type the 6th transistor M6, the gate interconnection of the transistor seconds M2 of grid and N type transducer, drain electrode connects with the output of P type transducer and is connected.
The first transistor M1 and the 4th transistor M4 constitute source follower respectively, are coupled to output end vo by ac coupling capacitor (C1 and C2) respectively, and output end vo is followed differential input signal anode Vi+ in the same way.Transistor seconds M2, the 3rd transistor M3, the 5th transistor M5 and the 6th transistor M6 constitute common-source amplifier respectively, are coupled to output end vo by ac coupling capacitor (C1 and C2) respectively, and Vi-oppositely amplifies with the differential input signal negative terminal.Because Vi+ and Vi-are reverse, the output of source follower and common-source amplifier is in the same way so, and both can directly merge, and finish differential-to-single-ended translation function.
Claims (2)
1, a kind of radio-frequency differential-to-single-ended converter is characterized in that: N type radio-frequency differential-to-single-ended converter and P type radio-frequency differential-to-single-ended converter by parallel connection are formed, and are connected between power supply and the ground wire;
The output of described N type radio-frequency differential-to-single-ended converter and P type radio-frequency differential-to-single-ended converter is ac-coupled to output (Vo) by first electric capacity (C1) and second electric capacity (C2) respectively; Import shared, be that the first transistor (M1) of N type radio-frequency differential-to-single-ended converter and the 4th transistor (M4) of P type radio-frequency differential-to-single-ended converter use same differential input signal anode (Vi+), the transistor seconds (M2) of N type radio-frequency differential-to-single-ended converter and the 3rd transistor (M3) of P type radio-frequency differential-to-single-ended converter use same differential input signal negative terminal (Vi-); Form the push-pull type radio-frequency differential-to-single-ended converter;
Described N type radio-frequency differential-to-single-ended converter comprises two N transistor npn npns, be the first transistor (M1) and transistor seconds (M2), the drain electrode interconnection of the source electrode of the first transistor (M1) and transistor seconds (M2) is as output (Vo), the drain electrode of the first transistor (M1) connects power supply, the source ground line of transistor seconds (M2), differential input signal anode (Vi+) is input to the grid of the first transistor (M1) by AC coupled, and differential input signal negative terminal (Vi-) is input to the grid of transistor seconds (M2) by AC coupled;
Described P type radio-frequency differential-to-single-ended converter comprises two P transistor npn npns, i.e. the 3rd transistor (M3) and the 4th transistor (M4), the source electrode interconnection of the drain electrode of the 3rd transistor (M3) and the 4th transistor (M4) is as output (Vo), the source electrode of the 3rd transistor (M3) connects power supply, the grounded drain of the 4th transistor (M4), differential input signal anode (Vi+) is input to the grid of the 4th transistor M4 by AC coupled, and differential input signal negative terminal (Vi-) is input to the grid of the 3rd transistor (M3) by AC coupled.
2, radio-frequency differential-to-single-ended converter as claimed in claim 1 is characterized in that: also comprise P type the 5th transistor (M5) and N type the 6th transistor (M6); The source electrode of described P type the 5th transistor (M5) connects power supply, the gate interconnection of the 3rd transistor (M3) of grid and described P type radio-frequency differential-to-single-ended converter, and draining is connected with the output that connects N type radio-frequency differential-to-single-ended converter; The source ground line of N type the 6th transistor (M6), the gate interconnection of the transistor seconds (M2) of grid and N type radio-frequency differential-to-single-ended converter, drain electrode connects with the output of P type radio-frequency differential-to-single-ended converter and is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101165539A CN100559706C (en) | 2006-09-27 | 2006-09-27 | Radio-frequency differential-to-single-ended converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101165539A CN100559706C (en) | 2006-09-27 | 2006-09-27 | Radio-frequency differential-to-single-ended converter |
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| CN101154925A CN101154925A (en) | 2008-04-02 |
| CN100559706C true CN100559706C (en) | 2009-11-11 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101572483B1 (en) * | 2008-12-31 | 2015-11-27 | 주식회사 동부하이텍 | transmitter |
| TW201228090A (en) * | 2010-12-31 | 2012-07-01 | Ind Tech Res Inst | Input apparatus on chip for differential signals and balun thereof |
| CN103532497B (en) * | 2013-10-18 | 2016-08-24 | 中国科学技术大学 | A kind of ultra-wideband low-noise amplifier using inductance compensation technology |
| CN105591660A (en) * | 2014-10-23 | 2016-05-18 | 展讯通信（上海）有限公司 | Radio frequency transceiver and mobile terminal |
| CN108288742B (en) * | 2017-12-13 | 2021-02-12 | 成都四相致新科技有限公司 | Radio frequency isolation gate, signal isolation method, radio frequency isolation transmission circuit and transmission method |
| CN113014232A (en) * | 2021-02-23 | 2021-06-22 | 成都西瓴科技有限公司 | Low-jitter differential clock receiving circuit |
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2006
- 2006-09-27 CN CNB2006101165539A patent/CN100559706C/en active Active
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