KR20030009655A - Multi-band radio-frequency module whose configuration is minimized - Google Patents

Abstract

PURPOSE: A multi-band wireless frequency module having a minimized configuration is provided to configure a shared circuit for each wireless frequency band by variable capacitors and variable inductors, thereby minimizing hardware size. CONSTITUTION: Signals of many wireless frequency bands are received to be converted into baseband signals. The baseband signals are inputted to a baseband processor. Baseband signals of the baseband processor are converted into signals of the wireless frequency bands. The converted signals are transmitted. MEMS(Micro-Electro-Mechanical Systems) variable capacitors and variable inductors are fabricated by an MEMS technology. The variable capacitors and the variable inductors are changed by a connected state of an additional switch in accordance with a service selection signal of a user. Multipath switches(3,11,15,16,21), a wideband power amplifier(5), variable band-pass filters(6,8,10,13,17,18), a variable driving amplifier(7), a variable low noise amplifier(12), a variable voltage controlled oscillator(20), and a variable low-pass filter(22) are shared for each wireless frequency band.

Description

Multi-band radio-frequency module whose configuration is minimized}

The present invention relates to a multi-band radio frequency module, and more particularly, to receive signals of a plurality of radio frequency bands, convert them into baseband signals, input them to a baseband processor, and a baseband processor. A multi-band radio frequency module for converting signals in a band into signals in radio frequency bands for transmission.

Wireless communication schemes currently used include Code Division Multiple Access, Global System for Mobile communication, Personal Communication System, I.M.T. (International Mobile Telecommunication) -2000 and Wireless-Personal Area Network. As such different wireless communication schemes are used, multi-band radio frequency modules of a radio transceiver are being developed to use them integrally.

However, these multi-band radio frequency modules require circuits corresponding to the frequency bands of the respective communication schemes, thereby increasing the size of the hardware. For example, the multi-band radio frequency module of US Pat. No. 6,175,746 is provided with circuits corresponding to the frequency band of each communication scheme, so that the scale of the hardware is large. On the other hand, the multi-band radio frequency module of US Pat. No. 6,049,702 has the effect of reducing the wiring lines by using switches, but there is a problem that the size of the hardware is large because the switches are used a lot.

It is an object of the present invention to provide a multi-band radiofrequency module in which the construction thereof is minimized so that the scale of the hardware can be minimized.

1 is a block diagram illustrating a multi-band radiofrequency module according to an embodiment of the present invention.

FIG. 2 is a circuit diagram illustrating an internal configuration of a variable voltage controlled oscillator of the module of FIG. 1.

3 is a circuit diagram illustrating an internal configuration of amplifiers of the module of FIG. 1.

4 is a circuit diagram illustrating an internal configuration of band-pass filters of the module of FIG. 1.

<Explanation of symbols for the main parts of the drawings>

1 ... broadband antenna, 2 ... duplexer,

3, 11, 15, 16, 21 ... multipath switch, 4 ...

5 ... wide band power amplifier, 7 ... variable drive amplifier,

6, 8, 10, 13, 17, 18 ... variable band-pass filters,

9, 14 ... Wideband mixer, 12.Variable low noise amplifier,

20 variable voltage controlled oscillator, 201 variable resonator,

202 oscillator, 19 amplifier,

22 ... variable low-pass filter, 23 ... phase detector,

24 ... reference oscillator S _I ... baseband input signal,

S _O ... baseband output signal, S _CC ... service selection signal,

MV _C1 ... M.M.S. variable capacitors,

M _L1 ... M.M.M.S inductor, V _CC ...

S _IN1 , S _IN2 ... input signal, S _OUT1 , S _OUT2 ... output signal,

R1, R2, R3 ... resistor, TR1 ... transistor,

MV _L1 , ..., MV _L6 ... M.M.S. variable inductors,

M _C2 , ..., M _C7 ... M.M.S capacitors.

The present invention for achieving the above object, receives the signals of a plurality of radio frequency bands and converts the signals of the base band to the baseband processing unit, and the baseband signals from the baseband processing unit signals of the radio frequency bands Is a multi-band radio frequency module that converts the data into two. The module includes at least one variable capacitor and at least one variable inductor. The variable capacitor changes its capacitance in accordance with a service selection signal from a user. The inductor of the variable inductor changes in accordance with a service selection signal from a user.

According to the multi-band radio frequency module of the present invention, a shared circuit for each radio frequency band may be configured by the variable capacitor and the variable inductor. Accordingly, the configuration can be minimized so that the scale of the hardware can be minimized.

Preferably, the capacitor and the inductor are manufactured by Micro-Electro-Mechanical Systems technology, so that the capacitance and inductance are reduced by the contact state of the additional switch according to the service selection signal. Change.

Hereinafter, preferred embodiments according to the present invention will be described in detail.

Referring to FIG. 1, the multi-band radio frequency module according to an embodiment of the present invention receives signals R _X1 and R _X2 of a plurality of radio frequency bands and converts the signals into base band signals S _O. The signal is converted and input to a baseband processor (not shown), and the baseband signals S _I from the baseband processor are converted into signals _TX1 and _TX2 of radio frequency bands and transmitted. The module includes a wideband antenna (1), duplexer (2), multipath switches (3, 11, 15, 16, 21), receive signal isolator (4), wideband power amplifier (5), variable drive amplifier (7). ), Variable band-pass filters 6, 8, 10, 13, 17, 18, wideband mixers 9, 14, variable low noise amplifier 12, variable voltage controlled oscillator 20, amplifier 19 Variable low-pass filter 22, phase detector 23 and reference oscillator 24. The variable voltage controlled oscillator 20 includes a variable resonator 201 and an oscillator 202.

Here, multipath switches 3, 11, 15, 16, 21, wideband power amplifier 5, variable band-pass filters 6, 8, 10, 13, 17, 18, variable drive amplifier 7 ), Variable low noise amplifier 12, variable voltage controlled oscillator 20 and variable low-pass filter 22 have at least one M.S. variable capacitor (see MV _{C1 in} FIG. 2) or at least One M.M.S. variable inductor (see MV _L1 , ..., MV _{L6 in} FIG. 3 or 4). This M.M.S variable capacitor and variable inductor are manufactured by M.M.S. (Micro-Electro-Mechanical Systems) technology (the Korean Patent Application No. 2000 filed by the applicant) 33,911), its capacitance and inductance change according to the contact state of the additional switch according to the service selection signal from the user. Accordingly, multipath switches 3, 11, 15, 16, 21, broadband power amplifier 5, variable band-pass filters 6, 8, 10, 13, 17, 18, variable drive amplifiers ( 7), variable low noise amplifier 12, variable voltage controlled oscillator 20 and variable low pass filter 22 may be shared for each radio frequency band.

The wideband antenna 1 receives signals of a plurality of radio frequency bands from the outside and inputs them to the duplexer 2, while transmitting signals of the plurality of radio frequency bands from the duplexer 2 to the outside. The duplexer 2 inputs the radio frequency signals R _X1 and R _X2 from the broadband antenna 1 to the M.S.M. multipath switch 11 on the receiving side, and transmits the signals. The radio frequency signals T _X1 and T _X2 from the MMS multipath switch 3 on the side are input to the broadband antenna 1.

The MMS multipath switch 11 on the receiving side inputs the radio frequency signal R _X1 or R _X2 corresponding to the service selection signal from the user to the variable low noise amplifier 12. The variable low noise amplifier 12 removes noise of the input radio frequency signal R _X1 or R _X2 and then performs amplification. The variable band-pass filter 13 into which the radio frequency signal from the variable low noise amplifier 12 is input passes the signal in the frequency band according to the service selection signal from the user.

The variable voltage controlled oscillator 20 generates an oscillation signal S1 of a frequency according to the service selection signal from the user. The phase detector 23 generates a phase difference signal between the reference frequency signal from the reference oscillator 24 and the oscillation signal S1 from the variable voltage controlled oscillator 20. The variable low pass filter 22 into which the phase difference signal from the phase detector 23 is input generates the phase lock signals by passing a signal in the low frequency band according to the service selection signal from the user. The M.E.M.S multipath switch 21 inputs the phase lock signal S2 according to the service selection signal from the user to the variable resonator 201 of the variable voltage controlled oscillator 20. The variable resonator 201 inputs a signal having a resonance frequency according to the service selection signal from the user to the oscillator 202. The oscillator 202 inputs the oscillation signal S1 corresponding to the signal of the resonance frequency from the variable resonator 201 to the amplifier 19 and the phase detector 23. By such a phase-locked-loop circuit, the phase of the oscillation signal S1 from the variable voltage controlled oscillator 20 coincides with the phase of the reference frequency signal from the reference oscillator 24.

The amplifier 19 amplifies the oscillation signal S1 from the variable voltage controlled oscillator 20 and provides it to the broadband mixers 9 and 14. The wideband mixer 14 on the receiving side generates an in-phase component signal and a quadrature component signal of an intermediate frequency signal corresponding to the frequency difference between the two input signals. The M.M.S. multipath switch 15, to which the I (I) component signal is input, converts the I (I) component signal into a variable band-pass filter 17 corresponding to the service selection signal from the user. 18). Similarly, the M.M.S. multipath switch 15 into which the cue component signal is input may convert the cue component signal into a variable band-pass filter corresponding to the service selection signal from the user. (17 or 18). Accordingly, a child (I) component signal and a queue (Q) component signal is input to the variable band-pass filter (17 or 18) is a signal of a base frequency band (S _O) corresponding to the service-selection-signal from the user baseband Input to a processing unit (not shown).

On the other hand, the base frequency signal S _I from the baseband processor is input to the variable band-pass filter 10 on the transmitting side. This variable band-pass filter 10 passes a signal in an intermediate frequency band according to a service selection signal from a user. The wideband mixer 9 on the transmitting side generates a signal in the radio frequency band corresponding to the frequency difference between the oscillation signal from the amplifier 19 and the signal in the intermediate frequency band from the variable band-pass filter 10.

The variable band-pass filter 8, through which the signal of the radio frequency band is input from the broadband mixer 9, passes the signal of the radio frequency band according to the service selection signal from the user. The variable drive amplifier 7 amplifies the radio frequency band signal with an amplification degree according to the service selection signal from the user. The variable band-pass filter 6, through which the signal in the radio frequency band is input from the variable drive amplifier 7, passes the signal in the radio frequency band according to the service selection signal from the user. The broadband power amplifier 5 amplifies the radio frequency band signal with an amplification degree according to the service selection signal from the user. The receive signal isolator 4 isolates the abnormal received signal from the M.E.M.S multipath switch 3. The signal in the radio frequency band from the broadband power amplifier 5 is input to the M.E.M.S multipath switch 3 through the reception signal isolator 4. The M.E.M.S multipath switch 3 outputs a signal of a radio frequency band input through the reception signal isolator 4 to a terminal corresponding to the service selection signal from the user. The output signal is transmitted to the outside through the duplexer 2 and the broadband antenna 1.

Referring to FIG. 2, the variable voltage controlled oscillator 20 of the module of FIG. 1 includes a variable resonator 201 and an oscillator 202. The variable resonator unit 201 is configured as a parallel resonant circuit of an M.M.S variable capacitor MV _C1 and an M.M.S. inductor M _L1 . The M. C. variable capacitor MV _C1 changes its capacitance according to a contact state of an additional switch according to a service selection signal S _CC from a user. Accordingly, the variable resonator 201 inputs the phase lock signal S2 corresponding to the tuning frequency according to the service selection signal S _CC from the user to the oscillator 202. The oscillator 202 inputs the oscillation signal S1 corresponding to the signal of the resonance frequency from the variable resonator 201 to the amplifier 19 (FIG. 1) and the phase detector 23 (FIG. 1).

Referring to FIG. 3, the broadband power amplifier 5 or the variable low noise amplifier 12 of the module of FIG. 1 includes resistors R1, R2, R3, transistor TR1, M.S. MES. A variable inductor MV _L1 and an M.S.MS capacitor M _C2 are included. The transistor TR1 amplifies the input signal S _IN1 applied to the base and outputs the output signal S _OUT1 through the M. C. capacitor M _C2 . The inductance of the M.M.S. variable inductor MV _L1 is changed by the contact state of the additional switch according to the service selection signal (S _CC of FIG. 2) from the user. Here, the amplification degree is set by the power supply voltage (V _CC ), the resistors (R1, R2, R3) and the transistor (TR1), while the M.M.S (MEMS) variable inductor (MV _L1 ) Change. This is because the emitter current of the transistor TR1 varies with the inductance of the M. M. S. variable inductor MV _L1 . Therefore, the amplification degree is set according to the service selection signal (S _CC of FIG. 2) from the user.

4, in each of the band-pass filters 6, 8, 10, 13, 17, 18 of the module of FIG. 1, M. C. capacitors M _C3 ,. The frequency band of the output signal is set by means of a series-parallel circuit of M _C7 ) and M.M.MS variable inductors MV _L1 , ..., MV _L6 . The component of the input signal S _IN2 corresponding to the set frequency band is output as the output signal S _OUT2 . Here, each of the _M.M.S. variable inductors MV _L1 ,..., MV _L6 is determined by a contact state of an additional switch according to a service selection signal (S _CC of FIG. 2) from a user. Its inductance changes. Thus, the frequency band of each of the band-pass filters 6, 8, 10, 13, 17, 18 is set according to the service selection signal (S _{CC in} FIG. 2) from the user.

As described above, according to the multi-band radio frequency module according to the present invention, a shared circuit for each radio frequency band can be configured by a variable capacitor and a variable inductor. Accordingly, the configuration can be minimized so that the scale of the hardware can be minimized.

The present invention is not limited to the above embodiments, but may be modified and improved by those skilled in the art within the spirit and scope of the invention as defined in the appended claims.

Claims (5)

Receives signals of a plurality of radio frequency bands, converts them into baseband signals, inputs them to a baseband processor, and converts the baseband signals from the baseband processor into signals of radiofrequency bands and transmits them. In the radio frequency module, At least one variable capacitor whose capacitance varies in accordance with a service selection signal from a user, and A multi-band radio frequency module comprising at least one variable inductor whose inductance varies in accordance with a service selection signal from a user. The method of claim 1, The capacitor and the inductor are manufactured by Micro-Electro-Mechanical Systems technology, so that the capacitance and inductance are changed by the contact state of the additional switch according to the service selection signal. Radio Frequency Module. The method of claim 1, A multi-band radio frequency module for generating a local frequency signal tuned by a capacitance of a capacitor and an inductance of an inductor, wherein the capacitance varies according to a service selection signal from a user. The method of claim 1, And an amplifier amplifying an input signal by a transistor, wherein an emitter current of said transistor is controlled by said inductor. The method of claim 1, And a band-pass filter for setting a frequency band of the output signal by a series-parallel circuit of capacitors and inductors, wherein at least one inductance of the inductors varies with the service selection signal.