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Log amplifier based mixer

A logarithmic amplifier and mixer technology, applied in the electronic field, can solve the problems of large combined frequency interference, large influence of discreteness, and low sensitivity, and achieve the effects of reducing circuit cost, expanding dynamic range, and easy integration

Inactive Publication Date: 2013-05-22
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

[0005] 1) The mutual influence between the circuits of the above-mentioned mixer is serious, and the combined frequency interference is also large, resulting in the instability of the obtained mixed frequency signal;
[0006] 2) The above-mentioned mixer is greatly affected by the discreteness of component parameters, and the dynamic range of the signal that can be processed is small;
[0007] 3) The obtained mixed frequency signal is an attenuated signal with low sensitivity, which is difficult to meet various needs in practical applications

Method used

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Embodiment Construction

[0018] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0019] In order to avoid the interference of the combination frequency and obtain a mixed frequency signal with high stability, an embodiment of the present invention proposes a mixer based on a logarithmic amplifier, see figure 1 , including: the first resistor R 1 and the second resistor R 2 ,

[0020] The first resistor R 1 One end of the input first signal source V 1 , the first resistor R 1 The other ends are respectively connected to the first diode D 1 anode of the second diode D 2 cathode of the first diode D 1 cathode and the second diode D 2 The anode is connected to the output terminal of the operational amplifier A at the same time, and the output mixed signal voltage V o ;

[0021] The second resistor R 2 One end of the input s...

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Abstract

The invention discloses a log amplifier based mixer which comprises a first resistor and a second resistor. A first single source is input into one end of the first resistor, the other end of the first resistor is respectively connected with an anode of a first diode and a cathode of a second diode, and a cathode of the first diode and an anode of the second diode are simultaneously connected with an output end of an operation amplifier to output mixer signal voltage. A second signal source is input into one end of the second resistor, the other end of the second resistor is respectively connected with the anode of the first diode, the cathode of the second diode and a negative polarity input end of the calculation amplifier, and a positive polarity input end of the calculation amplifier is grounded. The mixer is easy to operate and integrate, simple in structure, and capable of conveniently obtaining stable and high-accuracy mixer signals, reducing circuit costs, and meeting multiple requirements in practical applications.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a mixer based on a logarithmic amplifier. Background technique [0002] A mixer is a non-linear device, and the output signal frequency is equal to the sum, difference, or other combination of the two input signal frequencies. [0003] The mixers in the prior art are usually diode mixers, balanced mixers and transistor mixers, all of which are composed of inductors and transformers. The above-mentioned mixer has a simple structure, can work in a relatively high frequency band, and output a mixed frequency signal. [0004] In the process of realizing the present invention, the inventor finds that at least the following disadvantages and deficiencies exist in the prior art: [0005] 1) The mutual influence between the circuits of the above-mentioned mixer is serious, and the combined frequency interference is also large, resulting in the instability of the obtained mixed freq...

Claims

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Application Information

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IPC IPC(8): H03D7/16
Inventor 林凌张林娜李刚
Owner TIANJIN UNIV
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