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A current source circuit

A current source and circuit technology, applied in the field of current source, can solve the problems that the input dynamic range of the voltage-controlled pulse current source circuit cannot cover weak and small signals, and the chopper circuit cannot work, etc.

Active Publication Date: 2019-05-14
KUKA ROBOTICS GUANGDONG CO LTD
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Problems solved by technology

The voltage-controlled current source can output a continuously changing current waveform under the control of a digital-to-analog converter (DAC) or other analog signals. When it is necessary to output an adjustable-amplitude current pulse, the analog signal (modulated signal) is usually chopped. As the control input of the current source, there is a problem in this method. When the input signal is very weak (such as less than 100mV), the general chopper circuit cannot work, which means that the input dynamic range of the voltage-controlled pulse current source circuit Can't cover weak signals

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  • A current source circuit

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[0032] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0033] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

[0034] Refer below figure 1 Current source circuits in some embodiments according to the invention are described.

[0035] Such as figure 1 As shown, according to an embodiment of the present inve...

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Abstract

The invention provides a current source circuit. The current source circuit comprises an amplifier, a first transistor, a second transistor and a first resistor, wherein the positive-going input end of the amplifier is an analog signal input end, and the reverse input end of the amplifier is a voltage signal feedback end, the reverse input end is connected with the current output end of the firsttransistor, and the output end is connected with the input end of the first transistor; the current output end of the first transistor is grounded through the first resistor, and the input end of thesecond transistor is a pulse signal input end; the output end of the second transistor is connected with the reverse input end of the amplifier. According to the current source circuit, the output ofa current source can be cut off instantly, so that the purpose of pulse output is achieved; in addition, due to the fact that the analog input end is free of a chopper circuit, the current source circuit can work under extremely low input voltage, and therefore the current source circuit can obtain wide-range pulse current output under the condition that the sampling resistance is unchanged.

Description

technical field [0001] The present invention relates to the field of current source technology, in particular to a current source circuit. Background technique [0002] The current source circuit is a common basic circuit in electronic application technology. This type of circuit can output a constant current, and the output current does not change with the change of the load within a certain range. [0003] There are a variety of circuits that can realize the function of a current source. Among them, there is a current source called a voltage-controlled current source. The output current of this current source circuit can be controlled by its input voltage, that is, the input voltage is linearly proportional to the output current. The voltage-controlled current source can output a continuously changing current waveform under the control of a digital-to-analog converter (DAC) or other analog signals. When it is necessary to output an adjustable-amplitude current pulse, the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/46
Inventor 刘文喜莫元劲
Owner KUKA ROBOTICS GUANGDONG CO LTD
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