CN101373982B - High-frequency wireless reception front-end circuit - Google Patents
High-frequency wireless reception front-end circuit Download PDFInfo
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- CN101373982B CN101373982B CN200710094038XA CN200710094038A CN101373982B CN 101373982 B CN101373982 B CN 101373982B CN 200710094038X A CN200710094038X A CN 200710094038XA CN 200710094038 A CN200710094038 A CN 200710094038A CN 101373982 B CN101373982 B CN 101373982B
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- drain electrode
- wireless reception
- buffer circuit
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Abstract
The invention discloses a high-frequency wireless receiving front-end circuit, which is formed by a low-noise amplifier, a frequency mixer, a buffer circuit and a filter which are sequentially connected, wherein the buffer circuit is a phase inverter. The inventive circuit replaces the phase inverter for a transconductance amplifier, so as to avoid spontaneous oscillation phenomenon and improve circuit stability; and the circuit needs not to amplify necessary compensation capacitance and may not restrict bandwidth, and is easy to manufacture in an integrated circuit.
Description
Technical field
The present invention relates to a kind of high-frequency wireless reception front-end circuit.
Background technology
Modern telecommunication circuit is to the linearity of receiving circuit, dynamic range, and requiring of signal bandwidth is increasingly high.In order to improve integrated level, reduce the sheet external component, circuit adopts the structure of nearly zero intermediate frequency usually.High-frequency wireless reception front-end circuit generally is made up of following module successively: low noise amplifier, and down-conversion mixer, buffer circuit and filter, as shown in Figure 1.Because advantages such as passive frequency mixer has linearity height, and flicker noise is low are extensively adopted in receiving circuit.But; Passive frequency mixer itself can not provide gain; And also can decay to some extent to received signal; Therefore between frequency mixer and filter, need a buffer circuit usually, this circuit converts the current signal of frequency mixer output to filter required voltage signal on the one hand, and circuit also provides certain gain to come the noise of rejects trap on the other hand.
In the prior art, this buffer circuit is a trsanscondutance amplifier, and is as shown in Figure 2.This is the feedback circuit of a band amplifier, so amplifier will guarantee that in design circuit itself stablizes, can spontaneous oscillation, and noise is low, and bandwidth is bigger.The noise here mainly is a flicker noise, and this is the noise that a kind of power spectral density is inversely proportional to frequency, and in nearly zero intermediate frequency receiving circuit, flicker noise can seriously be disturbed the low-frequency component of the signal after the down-conversion.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high-frequency wireless reception front-end circuit, can guarantee the stable of circuit, spontaneous oscillation can not take place, and noise is low, and bandwidth is big.
For solving the problems of the technologies described above, the technical scheme of high-frequency wireless reception front-end circuit of the present invention is, is formed by connecting in low noise amplifier, frequency mixer, buffer circuit and filter successively, and said buffer circuit is an inverter.
Further improvement as high-frequency wireless reception front-end circuit of the present invention is, said buffer circuit comprises two N type metal-oxide-semiconductor M1 and M2, and two P type metal-oxide-semiconductor M3 and M4; The grid of M1 is connected with the grid of M3, and the drain electrode of M1 is connected with the drain electrode of M3, is provided with resistance R 1 between the grid of M1 and the drain electrode of M1; The grid of M2 is connected with the grid of M4, and the drain electrode of M2 is connected with the drain electrode of M4, is provided with resistance R 2 between the grid of M2 and the drain electrode of M2; The source electrode of M1 and M2 connects power supply; The source ground of M3 and M4, the grid of said M1 are normal phase input end, and the grid of said M2 is an inverting input; The drain electrode of said M2 is a positive output end, and the drain electrode of said M1 is a reversed-phase output.
The present invention replaces trsanscondutance amplifier through adopting inverter, makes circuit that the phenomenon of spontaneous oscillation can not take place, and has strengthened the stability of circuit, and circuit does not need the necessary building-out capacitor of amplifier yet, can limiting bandwidth, and in integrated circuit, be easy to make.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the modular structure figure of high-frequency wireless reception front-end circuit;
Fig. 2 is the circuit diagram of the buffer circuit of existing high-frequency wireless reception front-end circuit;
Fig. 3 is the circuit diagram of the buffer circuit of high-frequency wireless reception front-end circuit of the present invention.
Embodiment
High-frequency wireless reception front-end circuit of the present invention is formed by connecting in low noise amplifier, frequency mixer, buffer circuit and filter successively, and said buffer circuit is an inverter.
As shown in Figure 2, said buffer circuit, promptly said inverter comprises two N type metal-oxide-semiconductor M1 and M2; And two P type metal-oxide-semiconductor M3 and M4, the grid of M1 is connected with the grid of M3, and the drain electrode of M1 is connected with the drain electrode of M3, is provided with resistance R 1 between the grid of M1 and the drain electrode of M1; The grid of M2 is connected with the grid of M4, and the drain electrode of M2 is connected with the drain electrode of M4, is provided with resistance R 2 between the grid of M2 and the drain electrode of M2; The source electrode of M1 and M2 connects power supply, and the source ground of M3 and M4, the grid of said M1 are normal phase input end; The grid of said M2 is an inverting input, and the drain electrode of said M2 is a positive output end, and the drain electrode of said M1 is a reversed-phase output.
High-frequency wireless reception front-end circuit provided by the present invention replaces the buffer circuit among Fig. 1 with a simple inverter, as shown in Figure 3.Inverter is essential in digital circuit, and seldom in analog circuit, uses as amplifier, and in fact the inverter of Fig. 3 has played the irrealizable effect of traditional amplifier of a complicacy in circuit.The phase difference of the input and output signal of single-stage inverter has only 180 degree, so the circuit among Fig. 3 can not spontaneous oscillation.Owing to do not had stability problem, circuit not to need the required huge building-out capacitor of amplifier, and building-out capacitor can serious limiting bandwidth.In IC-components, flicker noise is inversely proportional to transistorized area, and the transistor among Fig. 3 can design to such an extent that influence the performance of circuit very greatly and not, and this size almost is possible in common amplifier.
In sum, the present invention replaces trsanscondutance amplifier through adopting inverter, makes circuit that the phenomenon of spontaneous oscillation can not take place; Strengthened the stability of circuit; Circuit does not need the necessary building-out capacitor of amplifier yet, can limiting bandwidth, and in integrated circuit, be easy to make.
Claims (1)
1. a high-frequency wireless reception front-end circuit is formed by connecting in low noise amplifier, frequency mixer, buffer circuit and filter successively, it is characterized in that, said buffer circuit is an inverter; Said buffer circuit comprises two N type metal-oxide-semiconductor M1 and M2, and two P type metal-oxide-semiconductor M3 and M4, and the grid of M1 is connected with the grid of M3; The drain electrode of M1 is connected with the drain electrode of M3, is provided with resistance R 1 between the grid of M1 and the drain electrode of M1, and the grid of M2 is connected with the grid of M4; The drain electrode of M2 is connected with the drain electrode of M4, is provided with resistance R 2 between the grid of M2 and the drain electrode of M2, and the source electrode of M1 and M2 connects power supply; The source ground of M3 and M4, the grid of said M1 are normal phase input end, and the grid of said M2 is an inverting input; The drain electrode of said M2 is a positive output end, and the drain electrode of said M1 is a reversed-phase output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710094038XA CN101373982B (en) | 2007-08-24 | 2007-08-24 | High-frequency wireless reception front-end circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710094038XA CN101373982B (en) | 2007-08-24 | 2007-08-24 | High-frequency wireless reception front-end circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101373982A CN101373982A (en) | 2009-02-25 |
| CN101373982B true CN101373982B (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710094038XA Expired - Fee Related CN101373982B (en) | 2007-08-24 | 2007-08-24 | High-frequency wireless reception front-end circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101373982B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8620254B2 (en) * | 2010-02-04 | 2013-12-31 | Cornell University | Wireless communication device and system |
| EP3602091B1 (en) * | 2017-03-27 | 2023-01-04 | Waveguide Corporation | Sensor interfaces |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293434A (en) * | 1999-10-18 | 2001-05-02 | 日本电气株式会社 | Buff circuit |
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2007
- 2007-08-24 CN CN200710094038XA patent/CN101373982B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293434A (en) * | 1999-10-18 | 2001-05-02 | 日本电气株式会社 | Buff circuit |
Non-Patent Citations (1)
| Title |
|---|
| 许永生等.一种低噪声高线性度射频前端电路设计.《固体电子学研究与进展》.2006,第26卷(第2期),188-193. * |
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| Publication number | Publication date |
|---|---|
| CN101373982A (en) | 2009-02-25 |
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Granted publication date: 20120725 Termination date: 20130824 |