KR100499523B1 - RF Signal Gain controller - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system, and more particularly, to an RF signal gain adjustment controller that is adapted to generate a loop gain for controlling an RF adjustment time interval of an RF adjustment unit by itself in an RF adjustment loop of a radio receiver. The RF signal gain adjustment controller according to the present invention includes a receiver for receiving a radio frequency signal and converting it into a baseband signal, and an adjuster for generating a control signal for controlling the operation of the receiver by analyzing the output baseband signal. And an integrator that accumulates the generated control signal for a predetermined time, an absolute value converting unit that takes an absolute value of the accumulated value, and an output time of the control signal of the adjusting unit according to an output value of the absolute value converting unit. It consists of a loop gain adjuster that generates a loop gain signal for the RF adjuster to actively adjust the RF tuning time interval, thereby improving the RF tuning function and reducing the hardware burden and the time delay of the RF tuning.

Description

RF signal gain controller

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system, and more particularly, to an RF signal gain adjustment controller that is adapted to generate a loop gain for controlling an RF adjustment time interval of an RF adjustment unit by itself in an RF adjustment loop of a radio receiver.

In general, a transmitter of a communication system modulates and transmits a digital signal into an analog signal, and a receiver converts the received analog signal into a digital signal to recover the original digital signal.

At this time, the receiver amplifies the received analog signal and converts it into a digital signal. The automatic gain control (AGC) for stably controlling the amplitude of the received signal at a desired level and the mixer frequency of the receiver are controlled. Perform the signal processing function of Auto Frequency Control (AFC).

Digital signals obtained through such signal processing are referred to as baseband signals.

1 is a block diagram illustrating a conventional RF signal gain controller.

Referring to FIG. 1, an RF signal gain controller includes an RF receiver 100 for converting a signal received through airwaves into a baseband signal, and an analog / digital signal for converting an analog signal output from the RF receiver 100 into a digital signal. A digital converter 110, an RF adjusting unit 120 generating an automatic gain control (AGC), an automatic frequency control (AFC), and a DC offset control (DC-offset Control) signal using the converted digital signal; It is composed of a digital to analog converter 130 for converting the control signal generated by the RF adjuster 120 to an analog signal and transmitting to the RF receiver 100.

Here, the RF adjusting unit 120 includes an adder 121 for adding an output value of the analog / digital converter 110 and a predetermined reference value REF, a shift register 122 for storing an output value of the adder 121, It consists of an integrator 123 that accumulates the output value of the shift register 122.

The operation of the conventional RF signal gain controller configured as described above is as follows.

First, the RF receiver 100 amplifies, downconverts, and filters a radio frequency (RF) signal received through an antenna and converts the RF signal into a baseband signal. At this time, the amplification of the received signal is performed using an Auto Gain Control (AGC) amplifier (not shown), and a mixer (not shown) is used to obtain a baseband signal from which the carrier frequency is removed from the received signal.

Here, the AGC amplifier needs to continuously adjust the amplification gain in order to obtain the desired baseband signal strength, and the control signal used at this time is generated by the RF adjusting unit 120.

In addition, a local oscillator (not shown) of the RF receiver 100 down-converts the frequency of the baseband signal, and the RF adjuster 120 continuously controls the control signal to remove an error of the local frequency oscillator. Generates.

In addition, a signal passing through the AGC amplifier and the mixer of the RF receiver 100 may have an unwanted DC component. The RF adjuster 120 continuously removes the DC-offset control signal to remove the DC component. Generates.

Then, the RF receiver 100 outputs a baseband signal suitable for performing signal processing in a baseband receiver (not shown) using control signals generated by the RF adjuster 120.

As such, the RF receiver 100 receives a control signal from the RF receiver 120 for controlling the AGC amplifier, the mixer, and the DC offset cancellation circuit.

Meanwhile, referring to the operation of the RF adjuster 120, the adder 121 receives an output signal of the analog-to-digital converter 110, and receives the input signal from the input signal and a control processor (CP) (not shown). Find the difference from the input reference value (REF).

The output value of this adder 121 is stored in the shift register 122.

The shift register 122 shifts bit positions of stored values according to a loop gain value provided by the control processor CP, and the shifted bit values are input to the integrator 123 and accumulated.

Since the value accumulated in the integrator 123 represents an error with the reference value REF provided from the control processor CP, the RF adjuster 120 may convert the value accumulated in the integrator 123 into the digital / analog converter 130. It converts into an analog signal through and transmits it to the RF receiver 100 as a control signal.

 Here, the bit shift of the shift register 122 is for adjusting the RF adjustment time interval. That is, the shift register 122 performs bit shift to the right or left by the loop gain value given by the control processor CP, and then inputs this value into the integrator 123 and accumulates it.

For example, moving the bit position one bit to the right divides it by two, and one bit to the left divides it by two, so that the input value of the integrator 123 is increased to reduce the RF adjustment time interval. Therefore, the input value is made small so that the RF adjustment time interval is long.

The RF adjustment time interval needs to be reduced as the gain error, frequency error, and DC offset (DC-offset) value to be adjusted by the RF receiver 100 increases.

However, in the conventional RF signal gain controller, when the error value to be adjusted in the RF receiver is large, the RF adjustment time interval is reduced. On the contrary, when the error value is zero or small, the RF adjustment time interval is required to adjust the RF adjustment time interval. Since the loop gain is input from the control processor CP, it is impossible without the control of the control processor CP, and there is a problem in that hardware burden and time delay occur due to the control of the control processor CP.

Accordingly, an object of the present invention is to conceive in view of the problems of the prior art mentioned above, by generating a loop gain (LOOP GAIN) input to the RF adjustment unit itself to actively adjust the RF adjustment time interval according to the situation. To provide an RF signal gain adjustment controller.

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As an aspect of the present invention for achieving the above object, the RF signal gain adjustment controller according to the present invention, a receiving unit for receiving a radio frequency signal and converting it into a baseband signal, and analyzing the converted baseband signal An adjusting unit for generating a control signal for controlling the operation of the receiving unit, an integrator accumulating the control signal generated from the adjusting unit for a predetermined time, an absolute value converting unit taking an absolute value of the value accumulated by the integrator And a loop gain adjusting unit for generating a loop gain signal for controlling the generation time of the control signal of the adjusting unit according to the output value of the absolute value converting unit. Preferably, the adjusting unit outputs from the receiving unit. An adder for adding a predetermined baseband signal and a preset reference value, and an output of the adder And a shift register for shifting a bit position of the stored values according to a loop gain signal provided by the loop gain adjusting unit and an integrator accumulating an output value of the shift register. A configuration and an operation according to an example will be described with reference to the accompanying drawings. In the present invention, an RF signal gain for generating an LOOP GAIN input to the RF adjustment unit by itself and actively adjusting the RF adjustment time interval according to a situation. We propose a coordination controller.

To this end, the present invention accumulates a value of a control signal output from the RF adjuster for a predetermined time, and compares the accumulated value with a preset reference value to generate a loop gain for controlling the RF adjust time interval of the RF adjuster. The adjusting unit is further provided.

The loop gain adjuster sets a predetermined threshold value, and compares the set threshold value with a cumulative value of a control signal output from the RF adjuster, and reduces the RF adjustment time interval when the accumulated value is larger than the threshold value. After outputting the signal to the RF regulator, if the accumulated value is less than the threshold value, and outputs a loop gain to extend the RF adjustment time interval is transmitted to the RF regulator.

Then, the RF adjuster may appropriately adjust the RF adjust time interval according to the loop gain generated by the loop gain adjuster to generate a control signal optimized for the received signal to the RF receiver according to a situation.

2 is a block diagram illustrating an RF signal gain adjustment controller according to the present invention.

Referring to FIG. 2, an RF signal gain adjustment controller includes an RF receiver 200 that receives a radio frequency (RF) signal and converts the RF signal into a baseband signal, and an analog / digital converter that converts the converted baseband signal into a digital signal. And an RF adjuster 220 for analyzing a signal output from the analog-to-digital converter 210 to generate a control signal for controlling the operation of the RF receiver 200. The integrator 250 accumulates the control signal generated by the RF adjusting unit 220, the absolute value converting unit 240 taking an absolute value of the accumulated value of the integrator 250, and the absolute value converting unit 240. The loop gain adjuster 230 generates a loop gain for controlling the RF time interval of the RF adjuster 220 according to the output.

Here, the RF adjuster 220 stores an adder 221 that adds an output value of the analog-to-digital converter 210 and a predetermined reference value REF, and an output value of the adder 221, and the loop gain adjuster ( The shift register 222 performs a bit shift of the stored values according to the loop gain provided at 230, and an integrator 223 accumulates an output value of the shift register 222.

The operation of the RF signal gain adjustment controller configured as described above is as follows.

First, the integrator 250 accumulates the control signal output from the RF adjuster 220 during the RF adjust time.

Subsequently, the absolute value converting unit 240 takes an absolute value of values accumulated in the integrator 250.

Since the absolute value taken by the absolute value converting unit 240 becomes an RF adjusting value for the RF adjusting unit 220 to perform during the RF adjusting time, the loop gain adjusting unit 230 uses the absolute value of the RF of the RF adjusting unit 230. Generate loop gain to control the adjustment time interval.

At this time, when the absolute value taken by the absolute value converter 240 is greater than a preset threshold value, the loop gain adjuster 230 generates a loop gain to reduce the RF adjustment time interval, and generates an absolute value. If it is less than this threshold, a loop gain is generated that increases the RF adjustment time interval.

Then, the loop gain adjuster 230 transmits the generated loop gain to the shift register 222 of the RF adjuster 230, and the shift register 222 is the number of bit shifts according to the loop gain transmitted from the loop gain adjuster 230. Adjust the size of the error value input to the integrator 223.

That is, the loop gain generated by the loop gain adjusting unit 230 adjusts the number of bit shifts of the shift register 222 that stores the output value of the adder 221 and thus the magnitude of the error value input to the integrator 223. And finally change the gain of the RF adjusting unit 220.

Therefore, since the error value input from the shift register 222 is changed, the integrator 223 changes the control signal accordingly and is generated by the RF receiver 200.

Meanwhile, the loop gain adjuster 230 generates a clear signal for initializing the integrator 250 whenever the loop gain value is updated.

Then, the integrator 250 accumulates the output value of the RF adjuster 220 again each time the clear signal is received.

On the other hand, the integrator 250 does not need to continuously accumulate the output values of the RF adjuster 220. That is, since the RF adjustment time interval is generally set in millisecond units, it is longer than the output interval of the RF adjustment unit 220. Therefore, the integrator 250 may perform the same operation in the loop gain adjustment unit 230 even if the output value of the RF adjustment unit 220 is sampled and accumulated at regular time intervals during the RF adjustment time interval, and thereby, logic. It can reduce the power required.

As described above, the RF signal gain adjusting controller according to the present invention generates the loop gain by itself in the loop gain adjusting unit and adjusts the RF adjusting time interval of the RF adjusting unit, so that the RF adjusting time interval to be adjusted is large and the RF adjusting time interval should be shortened. In this case, it is possible to optimize the RF tuning function according to the situation by shortening the RF tuning time interval and increasing the RF tuning time interval when the RF tuning time interval is long because the RF tuning value is small.

In addition, since the loop gain is generated by itself, it is not necessary to include a control processor, thereby reducing the hardware burden, and there is an effect of controlling the received signal quickly according to the situation.

1 is a block diagram illustrating an RF signal gain controller in a conventional communication system.

2 is a block diagram illustrating an RF signal gain controller in a communication system according to the present invention.

* Description of the symbols for the main parts of the drawings *

200: RF receiver 210: analog to digital converter

220: RF adjusting unit 230: loop gain adjusting unit

240: absolute value conversion unit 250: integrator

260: Digital to Analog Converter

Claims (5)

A receiver which receives a radio frequency signal and converts the signal into a baseband signal; An adjusting unit which analyzes the converted baseband signal and generates a control signal for controlling the operation of the receiving unit; An integrator that accumulates the control signal generated from the adjusting unit for a predetermined time; An absolute value converting unit which takes an absolute value of values accumulated by the integrator, And a loop gain adjuster for generating a loop gain signal for controlling the generation time of the control signal of the adjuster according to the output value of the absolute value converter. The method of claim 1, wherein the adjustment unit, An adder for adding a baseband signal output from the receiver and a preset reference value; A shift register for storing an output value of the adder and shifting bit positions of the stored values according to a loop gain signal provided by the loop gain adjusting unit; And an integrator that accumulates an output value of the shift register. The method according to claim 1 or 2, The loop gain adjustment unit compares the accumulated value of the control signal output from the adjusting unit with a preset threshold value, and outputs a loop gain signal for reducing the RF adjustment time interval when the accumulated value is larger than the threshold value. And outputting a loop gain signal for extending the RF adjustment time interval when the cumulative value is smaller than the threshold value. The method of claim 3, And the loop gain adjustment unit generates a clear signal for initializing the integrator when the loop gain signal is updated. The method of claim 4, wherein And the integrator accumulates output values of the adjuster again when a clear signal is received from the loop gain adjuster.