A current sampling and holding circuit and signal acquisition system
A signal acquisition system and holding circuit technology, applied in the direction of measuring current/voltage, electronic switches, electrical components, etc., can solve the problems of large current noise, affecting the signal-to-noise ratio of the signal acquisition system, etc., and achieve the effect of large dynamic range
Active Publication Date: 2019-06-21
SHENZHEN GOODIX TECH CO LTD
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However, the increased bias current will introduce a lot of current noise, which affects the signal-to-noise ratio of the signal acquisition system
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[0017] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0018] see figure 2 , an embodiment of the present application provides a current sampling and holding circuit, the current sampling and holding circuit includes:
[0019] The cancellation circuit 21 is connected in series between the VDD terminal and the current sensor 11 , and is turned on according to the first enable signal, and the output current cancels the DC current component in the current sensor 11 .
[0020] The mirror...
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A current sampling and holding circuit and a signal acquisition system, the current sampling and holding circuit includes: an offset circuit, connected in series between the VDD terminal and a current-type sensor, connected according to a first enable signal, and the output current offsets the current-type sensor The DC current component in the sensor; the mirror circuit, connected in parallel with the offset circuit and the current-type sensor connected in series between the VDD terminal and the ground voltage, according to the second enabling signal opposite to the first enabling signal The signal is turned on, and the current transfer is carried out by using the current difference obtained by the mirror current of the shunt current and the output current of the current-type sensor. The application improves the establishment speed of the current sampling and holding circuit and reduces the output noise of the current sampling and holding circuit.
Description
technical field [0001] The present application relates to the technical field of current sampling and holding, in particular to a current sampling and holding circuit and a signal acquisition system. Background technique [0002] see figure 1 , in the signal acquisition system, the current sensor 11 outputs the AC part of the current, so a cancellation circuit 12 is usually added to obtain and cancel the DC component of the current output by the current sensor 11 . However, the limited settling time of the canceling circuit 12 will affect the waiting time of subsequent circuits, thereby reducing the efficiency of the entire acquisition system. [0003] However, in the sampling phase, when the first enable signal sh is high, the first switch S1 is closed, and at this time the gate and drain of the first P-type MOS transistor M1 are short-circuited, so the first P-type MOS transistor M1 It is equivalent to a resistor with a resistance value of 1 / gm1, and gm1 is the transcond...
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IPC IPC(8): G01R19/00
CPCG01R19/0053G11C27/028H03F3/45273H03F3/45753G11C27/02H03K17/6872
Inventor 张孟文
Owner SHENZHEN GOODIX TECH CO LTD