Differential Balanced Current Conveyor
A technology for balancing current and transmitters, applied in instruments, adjusting electrical variables, control/regulation systems, etc., can solve problems such as signal distortion and low transmission accuracy of current transmitters, and achieve low phase distortion, high-precision transmission, and flat frequency The effect of response
Inactive Publication Date: 2016-01-20
钟其炳
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Problems solved by technology
[0005] The present invention solves the technical problem of low transmission accuracy of the above-mentioned current transmitter and causes signal distortion, and provides a differential balanced current transmitter with high transmission accuracy and can directly process balanced current signals
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[0039] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0040] like figure 1 As shown, the differential balanced current transmitter of the present invention includes a power supply, a first input circuit 6, a second input circuit 7, and a first constant current source circuit for providing a stable bias current for the first input circuit 1 and the second constant current source circuit 8, the third constant current source circuit 5 and the fourth constant current source circuit 12 for providing a stable bias current of the second input circuit 7, six Darlington heteropolar current mirrors circuit and two DC servo circuits, the Darlington heteropolar current mirror circuit includes a first current mirror circuit 2, a se...
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The invention discloses a differential type balanced current transmitter which comprises a power supply, a first input circuit, a second input circuit, a first constant flow source circuit, a third constant flow source circuit, a fourth constant flow source circuit and a plurality of Darlington heterospolar type current mirror circuits, wherein each Darlington heterospolar type current mirror circuit comprises a first current mirror circuit, a third current mirror circuit, a firth current mirror circuit as well as a second current mirror circuit, a fourth current mirror circuit and a sixth current mirror circuit; the first current mirror circuit is connected with an earth wire; the second current mirror circuit is connected with the third current mirror circuit; the third current mirror circuit is connected with the sixth current mirror circuit; the firth current mirror circuit is connected with the fourth current mirror circuit. According to the differential type balanced current transmitter, the Darlington heterospolar type current mirror circuits are adopted, so that high precision transmission of current is realized, the distortion rate of signal current is greatly reduced, the linearity is improved greatly, and the frequency has very wide and flat frequency response and very low phase distortion.
Description
technical field [0001] The invention belongs to the technical field of current transmitters, in particular to a differential balanced current transmitter. Background technique [0002] The vast majority of current output DAC chips convert current signals into voltage signals through active or passive I / V circuits. If they are converted by circuits composed of transistor op amps or IC op amps, they Both are negative feedback circuits, which are limited by relatively small slew rate and relatively large phase shift, resulting in relatively large distortion. [0003] If you use passive I / V conversion, although there is no impact from the shortcomings of the active method, the output amplitude is limited due to the clamping circuit in the chip, and because the conversion level is not high, then through Amplification by subsequent amplifiers will inevitably reduce the signal-to-noise level, and the amplifier will also have inherent effects. [0004] Although there are currently...
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IPC IPC(8): G05F3/26
Inventor 钟其炳
Owner 钟其炳