CN206135890U - High accuracy logarithmic amplifier - Google Patents

Abstract

The utility model discloses a high accuracy logarithmic amplifier belongs to the communications field, and it includes that the merit divides ware, wave detector, high -gain input amplifier, clipper -limiter and multiplier, the input received signal of ware is divided to the merit, the merit divides two outputs of ware to distinguish the input of tie geophone and high -gain input amplifier, the output of wave detector inserts the corresponding input of multiplier, the output of high -gain input amplifier inserts through the clipper -limiter the corresponding input of multiplier, the output output signal of multiplier. The utility model has the advantages that input output signal becomes the logarithm relation, and makes the user can be with the received signal at dynamic compress.

Description

A kind of high accuracy logafier

Technical field

This utility model is related to a kind of high accuracy logafier, belongs to the communications field, is particularly suited for wide dynamic The receiver of scope.

Background technology

In the radio systems such as radar, communication and remote measurement, the signal that antenna is received often has very wide dynamic model Enclose, this just brings many problems to the design of receiver.On the one hand, linear amplifier is due to fixed gain, therefore Output saturation is easily caused when the signal of wide dynamic range is processed；On the other hand, receiver is the letter for receiving antenna Give the A-D converter of rear class after number transformed, but the manageable dynamic range of signals of A-D converter be it is certain, because This is also required to the dynamic range compression of signal to the manageable scope of A-D converter.

Utility model content

Technical problem to be solved in the utility model there is provided a kind of input/output signal into the high-precision of logarithmic relationship Degree logafier so that the signal for receiving can be compressed by user in dynamic range.

The technical solution of the utility model is as follows：

A kind of high accuracy logafier, which includes power splitter, cymoscope, high-gain input amplifier, amplitude limiter and takes advantage of Musical instruments used in a Buddhist or Taoist mass；The input of the power splitter receives signal, two outfan difference tie geophones of the power splitter and high-gain The input of input amplifier, the outfan of the cymoscope access the respective input of the multiplier, and the high-gain is defeated The outfan Jing amplitude limiters for entering amplifier access the respective input of the multiplier, the outfan output letter of the multiplier Number.

Further, the gain of the high-gain input amplifier is more than or equal to 120dB.

Further, the input of the power splitter receives the signal of the wide dynamic range that signal is received from antenna, The input of power splitter is defeated by after the received machine front end conversion of the signal；After dynamic range of signals is compressed by this utility model Amplified filtering etc. again is given the external A-D converter of the multiplier outputs and is processed.

The beneficial effects of the utility model are as follows：

This utility model drives amplitude limiter that signal level is maintained at a fixed value by high gain amplifier, then with detection Voltage realizes the logarithmic transformation relation of output and input after being multiplied, so as to the input with wide dynamic range for receiving antenna Signal Compression is to the manageable scope of digital-to-analog converter in receiver；This utility model is practical and convenient, simple structure, it is easy to Production.

Description of the drawings

Fig. 1 is schematic block circuit diagram of the present utility model.

Specific embodiment

This utility model is described further with reference to Fig. 1 and embodiment.

As shown in figure 1, the present embodiment includes power splitter, cymoscope, high-gain input amplifier, amplitude limiter and multiplier； The input of the power splitter receives signal, and put respectively by tie geophone and high-gain input for two outfans of the power splitter The input of big device, the outfan of the cymoscope access the respective input of the multiplier, and the high-gain input is amplified The outfan Jing amplitude limiters of device access the respective input of the multiplier, the outfan output signal of the multiplier.

Further, the gain of the high-gain input amplifier is more than or equal to 120dB.

Further, the input of the power splitter receives the signal of the wide dynamic range that signal is received from antenna, The input of power splitter is defeated by after the received machine front end conversion of the signal；After dynamic range of signals is compressed by this utility model Amplified filtering etc. again is given the external A-D converter of the multiplier outputs and is processed.

The operation principle of the present embodiment is as follows：

Input signal Jing power splitters first are divided into two-way and are respectively processed：

The cymoscope carries out logarithmic detector to the signal all the way after work(point, then gives the multiplier by detecting circuit Be multiplied end all the way.

Another road signal after work(point gives the high-gain input amplifier carries out linear amplification, and signal Jing high-gains are defeated Enter after amplifier amplifies and there is very high level, the amplitude limiter is by signal limiter is to a fixed level and is passed to institute State another road multiplication port of multiplier.

Input signal has very wide dynamic range, in order that input signal makes amplitude limiter in full dynamic range in amplitude limit State now works, and the high-gain input amplifier gain reaches more than 120dB, even can also under minimum incoming level Signal is amplified to more than the simulation level that amplitude limiter is played when amplitude limit is acted on.

The fixed level that detecting circuit is exported with the amplitude limiter is exported after being multiplied by a multiplier.Due to inspection Wave voltage and input signal into logarithmic relationship, therefore, the output signal of the multiplier also just with input signal into logarithmic relationship, Complete the function of logarithmic amplification.As the amplitude limit output level of amplitude limiter is fixed, therefore the precision of the present embodiment is main Depending on the precision of detecting circuit, and the detection precision of cymoscope can accomplish very high, therefore also just determine that the present embodiment is A kind of high-precision logafier.

It is this utility model preferably implementation above, it should be noted that above-described embodiment is only this utility model The preferred version of realization, and indefiniteness is exhaustive, in addition, with there are other realization sides in the case where this utility model is conceived Case, without departing from the concept of the premise utility, it is any it is obvious replacement this utility model protection domain it It is interior.

Claims (2)

1. a kind of high accuracy logafier, it is characterised in that：Which includes power splitter, cymoscope, high-gain input amplifier, limit Width device and multiplier；The input of the power splitter receives signal, two outfan difference tie geophones of the power splitter With the input of high-gain input amplifier, the outfan of the cymoscope accesses the respective input of the multiplier, described The outfan Jing amplitude limiters of high-gain input amplifier access the respective input of the multiplier, the outfan of the multiplier Output signal.

2. high accuracy logafier according to claim 1, it is characterised in that：The increasing of the high-gain input amplifier Benefit is more than or equal to 120dB.