Current compensation circuit and operation method of compensation current
A current compensation circuit, a technology for compensating current, applied in the field of analog front end, can solve the problems of negative influence of circuit performance and large compensation capacitor.
Pending Publication Date: 2021-11-30
NOVATEK MICROELECTRONICS CORP
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Problems solved by technology
[0003] Doing so will result in an excessively large value for the compensation capacitor, resulting in a large area of capacitance in the layout area and negatively impacting circuit performance
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[0038] In order to facilitate the understanding of the purpose, features and effects of the present invention, specific embodiments and drawings are provided below for detailed description of the present invention.
[0039] refer to Figure 2A , which is a diagram of an analog front end of a current compensation circuit according to a specific embodiment of the present invention.
[0040] The analog front end has a pulse width modulation current compensation circuit 200 including a first operational amplifier 210 , a second operational amplifier 230 , a positive current electronic switch 240 and a negative current electronic switch 250 . The first operational amplifier 210 and the second operational amplifier 230 function as an integrator.
[0041] The first operational amplifier 210 includes a first negative input terminal and a first positive input terminal, and the first positive input terminal receives an input voltage signal V TX . The first operational amplifier 210 f...
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The invention discloses a current compensation circuit and an operation method of a compensation current. The operation method of compensation current, applicable to analog front end, comprises sensing a current state and determining whether the current state is a positive or negative current state. An appropriate control signal is determined according to the current state, and if the current state is a negative current state, the appropriate control signal is sent to conduct the positive current electronic switch, or if the current state is a positive current state, the appropriate control signal is sent to conduct the negative current electronic switch. When the positive current electronic switch is turned on, the positive compensation current flows to offset the negative parasitic current, and when the negative current electronic switch is turned on, the negative compensation current flows to offset the positive parasitic current. The main control unit uses pulse width modulation signals of different widths related to different current states to send the pulse width modulation signals so as to conduct the positive current electronic switch or the negative current electronic switch.
Description
technical field [0001] The present invention relates to an analog front end (AFE), in particular to an analog front end circuit with pulse width modulation current compensation, its current compensation circuit and an operation method for compensating current. Background technique [0002] refer to figure 1 , which is a diagram of the analog front-end detection circuit 10 . When T[n] receives a sensing signal source, it converts the signal into a current I sense , and store it in the integrator 20. Unfortunately, there are many parasitic capacitances in the sense path, which makes the sense current from I sense becomes I sense +I other . To offset I other The excess current, the existing technology increases the capacitance compensation circuit C comp . Compensation current I comp is achieved by compensating the high voltage (V comph ) and compensation low voltage (V compl ) generated by voltage switching. [0003] Doing so would result in an excessively large v...
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IPC IPC(8): H03M1/06H03K7/08
CPCH03M1/06H03K7/08G05F1/461H03F3/45475H03F2200/129
Inventor 郑彦诚
Owner NOVATEK MICROELECTRONICS CORP