KR20050062804A - Apparatus for adjusting sensitivity - Google Patents

Abstract

The reception sensitivity adjusting apparatus of the present invention is characterized in that in a reception apparatus of a portable terminal, a low noise amplification process can be performed using a plurality of switches and a simple logic circuit without loss of passive elements, thereby reducing the overall noise figure. It is an object of the present invention to provide a reception sensitivity adjusting device which improves the reception sensitivity of the terminal.

In order to achieve the above object, the present invention, in the transceiver of the terminal including the ASM, is mounted between the antenna and the ASM, when the low noise amplification selection signal is activated, selective low noise for low noise amplification of the received signal input from the antenna Amplification unit; And a controller configured to generate the low noise amplification selection signal and to activate the low noise amplification selection signal when the strength of the received signal is below a reference level when the received signal is input.

Description

Reception sensitivity adjustment device {APPARATUS FOR ADJUSTING SENSITIVITY}

The present invention relates to an apparatus for adjusting reception sensitivity, and in particular, in a Global System for Mobile Communications (GSM) terminal, when the antenna switch is used to perform a reception mode and a transmission mode, reception sensitivity adjustment can be improved. Relates to a device.

FIG. 1 is a block diagram illustrating a conventional terminal transceiver, which will be described below.

The antenna 110 serves to transmit and receive radio waves with the base station.

In addition, the antenna switch module (ASM) 120 serves to switch to provide a reception path when receiving a signal from the antenna 110, and to provide a transmission path when transmitting a signal to the antenna 110. do.

Meanwhile, the Rx SAW (Surface Acoustic Wave) filter 130 serves to pass only a signal of a reception frequency band among the signals input from the antenna switch module (ASM) 120.

In addition, the low noise amplifier (LNA) 140 plays a role of low noise amplifying the signal input from the Rx surface acoustic wave (SAW) filter 130.

On the other hand, PAM (Power Amp Module) 150 receives a transmission signal and serves to amplify with sufficient power to transmit to the base station.

In addition, the Tx SAW filter 160 serves to pass only a signal of a transmission frequency band among the signals input from the power amp module (PAM) 150.

However, according to the conventional technique described above, the antenna switch module (ASM) 120 and the Rx Surface Acoustic Wave (SAW) filter 130, which are passive elements, are input before the received signal is input to the low noise amplifier (LNA) 140. As it passes, loss occurs (Insertion Loss), which causes a problem of deteriorating noise figure characteristics.

The present invention devised to solve the above problems, in the receiving device of the portable terminal, by using a plurality of switches and a simple logic circuit to perform a low noise amplification process without the loss of passive elements, the overall noise figure (Noise It is an object of the present invention to provide a reception sensitivity adjusting apparatus for improving characteristics and thereby improving reception sensitivity of a terminal.

In order to achieve the above object, the reception sensitivity adjusting apparatus of the present invention is mounted between an antenna and the ASM in a transceiver of a terminal including an ASM, and when a low noise amplification selection signal is activated, a reception signal input from the antenna is received. A selective low noise amplifier for low noise amplification; And a controller configured to generate the low noise amplification selection signal and to activate the low noise amplification selection signal when the strength of the received signal is below a reference level when the received signal is input.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the technical idea of the present invention. .

First, FIG. 2 is a block diagram illustrating an apparatus for adjusting reception sensitivity according to an embodiment of the present invention, and includes an optional low noise amplifier 210, a controller 220, an ASM 230, and an Rx SAW filter 240. .

The selective low noise amplifier 210 receives a low noise amplification selection signal and, when the low noise amplification selection signal is activated, serves to low noise amplify the received signal input from the antenna.

In addition, the controller 220 generates the low noise amplification selection signal and activates the low noise amplification selection signal when the strength of the received signal is equal to or less than a reference level when the received signal is input.

Meanwhile, the ASM 230 provides a reception path when receiving a signal from the antenna and switching to provide a transmission path when transmitting a signal through the antenna.

Meanwhile, the Rx SAW filter 240 serves to pass only a signal of a reception frequency band among the signals input from the ASM 230.

FIG. 3 is a block diagram illustrating the control unit 220 of FIG. 2.

The baseband IC 310 mounted in the controller 220 generates a receive turn-on signal that is activated by a second logic step High when a received signal is detected, and generates a second turn-on signal when the received signal is below a reference level. It generates a weak field detection signal that is activated in a logic step (High), and outputs the received turn-on signal and the weak field detection signal to the AND gate 320 to be described later.

In addition, the AND gate 320 mounted in the controller 220 receives the received turn-on signal and the weak field detection signal from the baseband IC 310, performs an AND operation, and then returns the result value. It serves to output as a low noise amplification selection signal.

FIG. 4 is a block diagram illustrating the selective low noise amplifier 210 of FIG. 2.

The LNA 410 mounted in the selective low noise amplifying unit 210 receives the low noise amplification selection signal, operates according to the activation of the low noise amplification selection signal, and performs low noise amplification of the received signal input from the antenna. do.

In addition, the plurality of switches 421 and 422 mounted in the selective low noise amplifier 210 receive the low noise amplification selection signal, and when the low noise amplification selection signal is activated, the received signal input from the antenna is the LNA. And switches to be conductive at 410.

Referring to the operation of the reception sensitivity adjusting apparatus of the present invention described above is as follows.

First, when the received signal of the weak field is received, the baseband IC 310 activates the received turn on signal and the weak field detection signal in a second logic step High.

Thereafter, the AND gate 320 mounted in the control unit 220 receives the turn-on signal and the weak field detection signal from the baseband IC 310, performs an AND operation, and selects the low noise amplification result. Output as a signal.

Thereafter, the plurality of switches 421 and 422 mounted in the selective low noise amplifier 210 switch to switch the received signal input from the antenna to the LNA 410 since the low noise amplification selection signal is activated. The LNA 410 mounted in the selective low noise amplifier 210 operates according to the activation of the low noise amplification selection signal to low noise amplify the received signal input from the antenna.

On the other hand, when the reception signal of the strong electric field is received or in the mode of transmitting the transmission signal, the reception turn-on signal and the weak field detection signal are deactivated in the first logic step Low.

Thereafter, the AND gate 320 mounted in the control unit 220 receives the turn-on signal and the weak field detection signal from the baseband IC 310, performs an AND operation, and selects the low noise amplification result. Output as a signal.

Thereafter, the plurality of switches 421 and 422 mounted in the selective low noise amplifier 210 switch so that the received signal input from the antenna is not conducted to the LNA 410 because the low noise amplification selection signal is deactivated.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawings shown.

The present invention improves the overall noise figure characteristic by allowing a low noise amplification process to be performed without a loss of passive elements in a receiving device of a portable terminal by using a plurality of switches and a simple logic circuit. Through this, there is an advantage of improving the reception sensitivity of the terminal.

1 is a block diagram showing a conventional terminal transceiver;

2 is a block diagram showing a reception sensitivity adjusting apparatus according to an embodiment of the present invention;

3 is a block diagram illustrating a control unit of FIG. 2;

4 is a block diagram illustrating a selective low noise amplifier of FIG. 2.

Explanation of symbols on the main parts of the drawings

210: selective low noise amplifier 220: control unit

230: ASM 240: Rx SAW Filter

Claims (3)

In the transceiver of the terminal including the ASM, An optional low noise amplification unit mounted between the antenna and the ASM and configured to low noise amplify a received signal input from the antenna when a low noise amplification selection signal is activated; And A controller for generating the low noise amplification selection signal and activating the low noise amplification selection signal when the strength of the received signal is below a reference level when the received signal is input; Receiving sensitivity adjustment device comprising a. The method of claim 1, wherein the control unit, A baseband IC that generates a receive turn-on signal that is activated when a received signal is detected and generates a weak field detection signal that is activated when the strength of the received signal is below a reference level; And An AND gate receiving the received turn-on signal and the weak electric field detection signal and performing an AND operation, and outputting the result as the low noise amplification selection signal. Receiving sensitivity adjusting device comprising a. The method of claim 1 or 2, wherein the selective low noise amplifier, An LNA operated according to the activation of the low noise amplification selection signal and configured to low noise amplify the received signal input from the antenna; And A plurality of switches for switching the received signal input from the antenna to be conducted to the LNA when the low noise amplification selection signal is activated Receiving sensitivity adjusting device comprising a.