KR20010017046A - Local switching apparatus available both cdma and amps using rf switch - Google Patents

Abstract

PURPOSE: A CDMA(Code Division Multiple Access)/AMPS(Advanced Mobile Phone System) local switching apparatus using an RF switch is provided to satisfy both CDMA and AMPS and to improve IMD or sensitivity specification by selectively switching a local level inputted from a mixer using two RF switches according to a mode. CONSTITUTION: A CDMA/AMPS local switching apparatus using an RF switch is a PLL(Phase Locked Loop)(10), the first RF switch(20), the first induction coil(30), the second induction coil(40), the second RF switch(50), a TR part(60) and a mixer(70). The PLL(10) receives a frequency signal and outputs a phase-locked tuning voltage to the input terminal #5 of the first RF switch(20). The first RF switch(20) receives high/low signals dependent on mode control signals from the TR part(60) through its input terminals #4 and #6 and outputs voltage to the first induction coil(30) and the second induction coil(40) through its output terminals #1 and #3. The first induction coil(30) receives voltage outputted from the output terminal #1 of the first RF switch(20) and supplies voltage to the input terminal #1 of the second RF switch(50). The second induction coil(40) receives voltage outputted from the output terminal #3 of the first RF switch(20) and supplies voltage to the input terminal #3 of the second RF switch(50). The second RF switch(50) receives high/low signals dependent on mode control signals from the TR part(60) through its input terminals #4 and #6, receives voltage from the first induction coil(30) and the second induction coil(40) through its input terminals #1 and #3 and outputs voltage to the mixer(70) through its output terminal #5. The TR part(60), comprised of a resistor(R) and a transistor(Q), receives voltage and mode control signals through the resistor(R) and outputs high/low signals to the input terminals #4 and #6 of the first RF switch(20) and the second RF switch(50). The mixer(70) receives voltage outputted from the output terminal #5 of the second RF switch(50) and mixes an RF signal outputted from the second RF switch(50) and a local signal.

Description

LOCAL SWITCHING APPARATUS AVAILABLE BOTH CDMA AND AMPS USING RF SWITCH}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local switching device for each code division multiple access (CDMA) and advanced mobile phone system (AMPS) mode using an RF switch. In particular, the CDMA, AMPS dual mode The present invention relates to a local switching device for each CDMA and AMPS mode using an RF switch that allows the local level of the mixer to be adjusted according to each mode by switching using the RF switch in the CDMA and AMPS modes.

In the conventional CDMA and AMPS dual mode mobile phones, the local level coming into the mixer is the same regardless of the mode, thereby fixing the level for either CDMA or AMPS.

However, in the conventional CDMA and AMPS dual-mode mobile phones described above, although the IMD (InterModulation Distortion) or SPEC changes depending on the level coming into the mixer, the CDMA and AMPS dual mode mobile phones are fixed in accordance with either CDMA or AMPS mode. There was a disadvantage in IMD and sensitivity SPEC.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to satisfy CDMA and AMPS simultaneously by selectively switching the local level coming into the mixer according to the mode using two RF switches. In addition, the present invention provides a local switching device for each CDMA and AMPS mode using an RF switch that improves IMD or sensitivity SPEC.

Local switching device for each CDMA, AMPS mode using the RF switch as described above. A PLL for receiving a frequency signal and outputting a tuning voltage having a phase fixed thereto; A voltage is input from the PLL to an input terminal 5, a HIGH / LOW signal is input to an input terminal 4 and an input terminal 6, a voltage is output to an output terminal 1 and an output terminal 3, and an output terminal 2 is grounded. An RF switch; A first induction coil configured to receive a voltage output from the first output terminal, set a matching value suitable for CDMA, and apply a voltage to the first input terminal; A second induction coil configured to receive the voltage output from the third output terminal, set a matching value suitable for AMPS, and apply a voltage to the third input terminal; A second RF switch for inputting a HIGH / LOW signal to an input terminal 4 and an input terminal 6, a voltage input to an input terminal 1 and an input terminal 3, and an output terminal 2 being grounded and outputting a voltage to an output terminal 5; A TR unit for receiving a mode control signal and having a transistor for applying a set voltage and a transistor which is turned off when the signal is a LOW signal and turned on when the signal is a high signal, and outputs a HIGH / LOW signal to the input terminals 4 and 6, respectively. ; And a mixer which receives the voltage output to the output terminal 5 and mixes the RF signal and the local signal output from the second RF switch.

1 is a functional block diagram illustrating a configuration of a local switching device for each CDMA and AMPS mode using an RF switch according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

10: PLL 20: first RF switch

30: first induction coil 40: second induction coil

50: second RF switch 60: TR unit

70: mixer R1, R2: resistance

Q: transistor

Hereinafter, a local switching device for each CDMA and AMPS mode using an RF switch according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a functional block diagram showing the configuration of a local switching device for each CDMA, AMPS mode using an RF switch according to an embodiment of the present invention, CDMA, AMPS using an RF switch according to an embodiment of the present invention The local switching device for each mode includes a phase locked loop (PLL) 10, a first RF switch 20, a first induction coil 30, a second induction coil 40, and a second RF switch 50. , The TR unit 60, and the mixer 70.

The PLL 10 receives a frequency signal and outputs a tuning voltage having a fixed phase to an input terminal 5 of the first RF switch 20.

In addition, the first RF switch 20 has the output terminal 2 of the ground, the input terminal 5 receives the voltage from the PLL (10), from the TR unit 60 through the input terminal 4 and 6 input terminal. It receives the HIGH / LOW signal according to the mode control signal, and outputs a voltage to the first induction coil 30 and the second induction coil 40 through the first output terminal and the third output terminal.

Meanwhile, the first induction coil 30 receives a voltage output from the first output terminal of the first RF switch 20, is set to a matching value suitable for CDMA, and the second RF switch is provided through a first input terminal. Serves to apply voltage.

In addition, the second induction coil 40 receives the voltage output from the third output terminal of the first RF switch 20, is set to a matching value suitable for AMPS, and the second RF switch through the third input terminal It serves to apply a voltage to (50).

Meanwhile, the second RF switch 50 receives a HIGH / LOW signal according to a mode control signal from the TR unit 60 through input terminals 4 and 6, and inputs the first and third input terminals. The voltage is input from the induction coil 30 and the second induction coil 40, and the output terminal 2 is grounded and serves to output the voltage to the mixer 70 through the output terminal 5.

In addition, the TR unit 60 receives a voltage through the resistor R2 and receives a mode control signal so that the transistor Q is turned on when the signal is a LOW signal and is turned on when the signal is a LOW signal. A resistor R1 is provided and serves to output a HIGH / LOW signal to the first RF switch 20 and the second RF switch 50 through the input terminal 4 and the input terminal 6.

On the other hand, the mixer 70 receives the voltage output to the output terminal 5 serves to mix the RF signal and the local signal output from the second RF switch 50.

The operation of the local switching device for each of the CDMA and AMPS modes using the RF switch is as follows.

First, when the mode control signal is LOW, the transistor Q in the TR unit 60 is turned off, and the fourth input terminal of the first RF switch 20 and the second RF switch 50 is LOW, and the sixth input terminal is HIGH. do.

Then, a path through which the signal from the PLL 10 passes through the second induction coil 40 is formed to be suitable for AMPS.

In addition, when the mode control signal is HIGH, the transistor Q in the TR unit 60 is turned on, and the fourth input terminal of the first RF switch 20 and the second RF switch 50 is HIGH, and the sixth input terminal is LOW. do.

Then, a path through which the signal from the PLL 10 passes through the first induction coil 30 is formed to be suitable for CDMA.

As described above, according to the local switching device for each CDMA and AMPS mode using the RF switch according to the present invention, the CDMA and AMPS are simultaneously satisfied by selectively switching the local level coming into the mixer according to the mode using two RF switches. In addition, the IMD and the sensitivity SPEC are improved, and in particular, the AMPS IMD of the dual-mode mobile phone which is an export terminal is improved.

Claims (1)

A PLL for receiving a frequency signal and outputting a tuning voltage having a phase fixed thereto; A voltage is input from the PLL to an input terminal 5, a HIGH / LOW signal is input to an input terminal 4 and an input terminal 6, a voltage is output to an output terminal 1 and an output terminal 3, and an output terminal 2 is grounded. An RF switch; A first induction coil configured to receive a voltage output from the first output terminal, set a matching value suitable for CDMA, and apply a voltage to the first input terminal; A second induction coil configured to receive the voltage output from the third output terminal, set a matching value suitable for AMPS, and apply a voltage to the third input terminal; A second RF switch for inputting a HIGH / LOW signal to an input terminal 4 and an input terminal 6, a voltage input to an input terminal 1 and an input terminal 3, and an output terminal 2 being grounded and outputting a voltage to an output terminal 5; A TR unit for receiving a mode control signal and having a transistor for applying a set voltage and a transistor which is turned off when the signal is a LOW signal and turned on when the signal is a high signal, and outputs a HIGH / LOW signal to the input terminals 4 and 6, respectively. ; And a mixer which receives the voltage output from the output terminal 5 and mixes the RF signal output from the second RF switch and the local signal.