CN213937838U - Second grade mixer based on cell-phone - Google Patents

Abstract

The utility model relates to a wireless communication technology field discloses a pronunciation or the stable and higher second grade mixer based on cell-phone of data transmission, possesses: a local oscillator, which is configured in the second-stage mixer and is used for receiving the high-frequency signal; wherein a high frequency electromagnetic wave signal is generated within the local oscillator, the local oscillator mixing the high frequency electromagnetic wave signal with the high frequency signal to form a difference frequency signal; a wideband mixer having an LO buffer amplifier coupled to the output of the local oscillator for receiving the difference frequency signal; and a primary winding of the transformer is respectively connected with the differential signal output end of the broadband mixer, and the differential frequency signal is output after being coupled and gained by the transformer.

Description

Second grade mixer based on cell-phone

Technical Field

The utility model relates to a wireless communication technology field, more specifically say, relate to a second grade mixer based on cell-phone.

Background

Work in the field of wireless communications has brought about advances in the development of full-duplex wireless communication systems by simultaneously transmitting and receiving signals over a single wireless communication channel. At present, the applications occupying the high frequency band of 30MHz to 300MHz are increasing, and are aimed at the frequency band used in the voice or data communication system which is much higher. Because the starting level of linearity is high, it is difficult for the mixer to maintain linearity and conversion gain at lower frequencies, resulting in greater attenuation of voice or data during transmission.

Therefore, how to improve the linearity and the conversion gain of the mixer becomes a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's the aforesaid because the starting point level of linearity is higher, the mixer is difficult to keep linearity and conversion gain when lower frequency, leads to pronunciation or the great defect of data decay in transmission process, provides a pronunciation or the stable and higher second grade mixer based on cell-phone of gain of data transmission.

The utility model provides a technical scheme that its technical problem adopted is: a two-stage mixer based on a mobile phone is constructed, and the two-stage mixer is provided with:

a local oscillator, which is configured in the second-stage mixer and is used for receiving the high-frequency signal; wherein a high frequency electromagnetic wave signal is generated within the local oscillator, the local oscillator mixing the high frequency electromagnetic wave signal with the high frequency signal to form a difference frequency signal;

a wideband mixer having an LO buffer amplifier coupled to the output of the local oscillator for receiving the difference frequency signal;

and a primary winding of the transformer is respectively connected with the differential signal output end of the broadband mixer, and the differential frequency signal is output after being coupled and gained by the transformer.

In some embodiments, the device further comprises a first inductor, a first capacitor and a second capacitor,

one end of the first inductor and one end of the first capacitor are respectively connected with the output end of the local oscillator,

one end of the second capacitor is coupled to the other end of the first inductor, and the other end of the second capacitor is coupled to an LO buffer amplification end of the broadband mixer.

In some embodiments, the device further comprises a third capacitor and a second inductor,

one end of the third capacitor is connected with the output end of the baseband, the other end of the third capacitor is coupled to one end of the second inductor, and the other end of the second inductor is connected with the information source end of the broadband mixer.

In some embodiments, the inductor further comprises a third inductor and a fourth inductor connected in series,

one end of the third inductor is connected with a low-capacitance differential end of the broadband mixer,

one end of the fourth inductor is connected with the other low-capacitance differential end of the broadband mixer.

In some embodiments, the device further comprises a seventh capacitor and an eighth capacitor,

one end of the seventh capacitor is coupled to the other low-capacitance differential end of the broadband mixer, the other end of the seventh capacitor is connected to one end of the primary winding of the transformer,

one end of the eighth capacitor is coupled to the other low-capacitance differential end of the broadband mixer, and the other end of the eighth capacitor is connected to the other end of the primary winding of the transformer.

The second-stage mixer based on the mobile phone of the utility model comprises a local oscillator, a broadband mixer and a transformer, wherein the local oscillator is used for receiving high-frequency signals; generating a high-frequency electromagnetic wave signal in a local oscillator, wherein the local oscillator mixes the high-frequency electromagnetic wave signal with the high-frequency signal to form a difference frequency signal; the broadband mixer is used for receiving the difference frequency signal; the difference frequency signal is output after being coupled and gained by a transformer. Compared with the prior art, the problem that the mixer is difficult to keep linearity and conversion gain at lower frequency and the attenuation of voice or data is larger in the transmission process due to the fact that the starting point level of the linearity is higher through the matching use of the local oscillator, the broadband mixer and the transformer can be effectively solved.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic circuit diagram of an embodiment of a mobile phone-based secondary mixer.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1, in the first embodiment of the mobile phone based secondary mixer of the present invention, the mobile phone based secondary mixer 100 includes a Local Oscillator (LOIN), a wideband mixer U101 and a transformer Tr 101.

Specifically, a local oscillator (corresponding to LOIN) is configured in the second-stage mixer for receiving a high-frequency signal (corresponding to 30MHz to 300 MHz).

Wherein, a high frequency electromagnetic wave signal is generated in a local oscillator (corresponding LOIN), the local oscillator (corresponding LOIN) mixes the high frequency electromagnetic wave signal with the high frequency signal to form a difference frequency signal, and the difference frequency signal is output to the broadband mixer U101.

The wideband mixer U101 incorporates integrated RF and LO transformers, reaching 30dBm at its specified frequency range (300MHz to 4 GHz).

The LO buffer amplifier (corresponding to pin 15) of the wideband mixer U101 is coupled to the output of the local oscillator (corresponding to LOIN) for receiving the difference frequency signal.

The primary winding of the transformer Tr101 is respectively connected with a differential signal output end (corresponding to the 10 pins and 11 pins) of the broadband mixer U101, and a difference frequency signal is coupled and gained by the transformer Tr101 and then output to keep the linearity and the conversion gain of the mixing pair, so that the problem that the starting point level of the linearity is high, and the mixer is difficult to keep the linearity and the conversion gain at lower frequency, so that the voice or data is greatly attenuated in the transmission process is solved.

In some embodiments, in order to improve stability of the input high frequency signal, a first inductor L101, a first capacitor C101, and a second capacitor C102 may be disposed in the secondary mixer.

Wherein, the capacity of the second capacitor C102 is selected to be 1000 pF.

Specifically, one end of the first inductor L101 and one end of the first capacitor C101 are respectively connected to an output end of a local oscillator (corresponding to LOIN),

one end of the second capacitor C102 is coupled to the other end of the first inductor L101, and the other end of the second capacitor C102 is coupled to the LO buffer amplifier of the wideband mixer U101.

That is, a high frequency signal inputted from a local oscillator (corresponding to LOIN) is inputted to the wideband mixer U101 through the first inductor L101, the first capacitor C101 and the second capacitor C102.

In some embodiments, in order to improve the stability of the input baseband signal, a third capacitor C103 and a second inductor L102 may be disposed in the secondary mixer, wherein the capacity of the third capacitor C103 is selected to be 1000 pF.

Specifically, one end of the third capacitor C103 is connected to an output end of the baseband (corresponding to RFIN), the other end of the third capacitor C103 is coupled to one end of the second inductor L102, and the other end of the second inductor L102 is connected to an information source end (corresponding to pin 3) of the wideband mixer U101.

In some embodiments, in order to improve the gain effect of the output difference frequency signal, a third inductor L103 and a fourth inductor L104 may be disposed in the two-stage mixer, wherein the third inductor L103 and the fourth inductor L104 are connected in series.

Specifically, one end of the third inductor L103 is connected to a low-capacitance split end (corresponding to 10 pins) of the wideband mixer U101,

one end of the fourth inductor L104 is connected to the other low-capacitance split end (corresponding to pin 11) of the wideband mixer U101.

In some embodiments, the wideband mixer U101 further includes a seventh capacitor C107 and an eighth capacitor C108, one end of the seventh capacitor C107 is coupled to the other low-capacitance split end (corresponding to 10 pins) of the wideband mixer U101, and the other end of the seventh capacitor C107 is connected to one end of the primary winding of the transformer Tr 101.

One end of the eighth capacitor C108 is coupled to the other low-capacitance differential end (corresponding to pin 11) of the wideband mixer U101, and the other end of the eighth capacitor C108 is connected to the other end of the primary winding of the transformer Tr 101.

In particular, the mixer linearity performance improves when the input frequency approaches 150 MHz. Input, LO and output port return loss measurements. Overall performance is maintained in the VHF range compared to higher input frequencies. Thus, when used in radio design, its high IP3 and conversion gain results in maximum dynamic range, which maximizes adjacent channel interference rejection, thereby improving selectivity.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (5)

1. A two-stage mixer based on a mobile phone is characterized by comprising:

a local oscillator, which is configured in the second-stage mixer and is used for receiving the high-frequency signal; wherein a high frequency electromagnetic wave signal is generated within the local oscillator, the local oscillator mixing the high frequency electromagnetic wave signal with the high frequency signal to form a difference frequency signal;

a wideband mixer having an LO buffer amplifier coupled to the output of the local oscillator for receiving the difference frequency signal;

and a primary winding of the transformer is respectively connected with the differential signal output end of the broadband mixer, and the differential frequency signal is output after being coupled and gained by the transformer.

2. The handset based secondary mixer of claim 1,

also comprises a first inductor, a first capacitor and a second capacitor,

one end of the first inductor and one end of the first capacitor are respectively connected with the output end of the local oscillator,

one end of the second capacitor is coupled to the other end of the first inductor, and the other end of the second capacitor is coupled to an LO buffer amplification end of the broadband mixer.

3. The handset based secondary mixer of claim 1,

also comprises a third capacitor and a second inductor,

one end of the third capacitor is connected with the output end of the baseband, the other end of the third capacitor is coupled to one end of the second inductor, and the other end of the second inductor is connected with the information source end of the broadband mixer.

4. The handset based secondary mixer of claim 1,

also comprises a third inductor and a fourth inductor which are connected in series,

one end of the third inductor is connected with a low-capacitance differential end of the broadband mixer,

one end of the fourth inductor is connected with the other low-capacitance differential end of the broadband mixer.

5. The handset based secondary mixer of claim 4,

also comprises a seventh capacitor and an eighth capacitor,

one end of the seventh capacitor is coupled to the other low-capacitance differential end of the broadband mixer, the other end of the seventh capacitor is connected to one end of the primary winding of the transformer,

one end of the eighth capacitor is coupled to the other low-capacitance differential end of the broadband mixer, and the other end of the eighth capacitor is connected to the other end of the primary winding of the transformer.

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