Current output circuit and two-wire transmitter
An output circuit and transmitter technology, applied in the field of two-wire transmitters, can solve the problems of poor anti-noise ability, narrowed bandwidth, low AC input impedance, etc., to improve anti-noise ability and widen frequency band. Effect
Active Publication Date: 2016-01-20
YOKOGAWA ELECTRIC CORP
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Problems solved by technology
Therefore, in the current output circuit 50 of the related art two-wire transmitter, a circuit element having a low pole such as the current mirror circuit 54 is inserted into the Image 6 In the negative feedback loop of the operational amplifier 52 shown by the dotted arrow in , the bandwidth becomes narrower, the AC input impedance becomes lower, and the anti-noise ability becomes worse
Method used
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[0038] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0039] (Construction of Example)
[0040] figure 1 is a diagram showing the basic configuration of the two-wire transmitter according to the present embodiment. according to figure 1 , the two-wire transmitter 1 according to this embodiment includes a sensor 10 , a signal processing circuit 20 , and a current output circuit 30 . The two-wire transmitter 1 is connected to an external circuit 40 such as a DCS through a positive power supply terminal VP and a negative power supply terminal VN respectively connected to two transmission lines L1, L2.
[0041] The two-wire transmitter 1 is, for example, a field device, and receives power supply from an external circuit 40 through two transmission lines L1, L2. The sensor 10 measures a physical quantity and converts it into an electrical signal. The signal processing circuit 20 performs ...
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A current output circuit for a two-wire transmitter includes a first current source circuit configured to output a first current controlled by a control voltage generated based on a physical quantity, a second current source circuit configured to output a second current controlled by the first current, a first shunt voltage source circuit configured to generate an internal power source of the two-wire transmitter from the second current, a third current source circuit configured to generate a third current controlled by a reference voltage, and a second shunt voltage source circuit configured to generate a power source of the second current source circuit by the third current. The current output circuit is configured to output a predetermined current controlled by the control voltage based on the first current, the second current and the third current to an external circuit through two transmission lines.
Description
technical field [0001] The present disclosure relates to a current output circuit, which is connected to an external circuit through two transmission lines, and a predetermined current signal while using the external circuit as a power source, and a two-wire transmitter having the circuit output circuit output to this external circuit. Background technique [0002] A two-wire transmitter is, for example, a field device that is connected to an external circuit such as a DCS (Distributed Control System) through two transmission lines, and while using this external circuit as a power source, transmits data from a sensor, etc. The acquired physical quantity is converted into a current signal, and the current signal is output to the external circuit. Since two-wire transmitters do not require dedicated power wiring and can be installed at low cost, two-wire transmitters are widely used as temperature transmitters or differential pressure transmitters and pressure transmitters in...
Claims
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IPC IPC(8): G05F1/56G01D5/14
CPCG05F1/561H02J4/00
Inventor 羽鸟大辅岩野阳一
Owner YOKOGAWA ELECTRIC CORP