Multi-driving output circuit power noise restraining method
A technology of output circuit and power supply noise, which is applied in the field of interface timing characteristics of 16-channel serial conversion and constant current drive circuit, can solve the problems of large power supply noise and large circuit current change, and achieve the reduction of transient current change and suppression of power supply noise effect
Inactive Publication Date: 2007-09-12
BEIJING ZHONGQING MICRO ELECTRIC TECH
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[0002] At present, in the design of the existing multi-channel serial conversion and constant current drive circuit widely used in the market, the moment of setting the state of all constant current drives is the same, so the instantaneous current of the circuit changes greatly, resulting in the disadvantage of large power supply noise
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[0031] In the above-mentioned content, there are various situations for the input method of the input signal, the number and driving mode of the driving output ports, the determination relationship between the status data and the status of the driving output ports, and the sequence of the status changes of the driving output ports. In combination with the above, the working mode of the multi-drive output circuit in one of the cases will be described.
[0032] The way of working that will be described is shown in Figure 3 and features the following:
[0033] (1) The status data uses synchronous serial mode;
[0034] (2) Instructions use asynchronous serial mode;
[0035] (3) The drive output port is a current drive;
[0036] (4) There are 1-n channels of drive output ports, and n is 16;
[0037] (5) The corresponding relationship between the input status data and the drive output port is: "1" means there is current, "0" means no current;
[0038] (6) The sequence of the sta...
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The invention belongs to the output circuit control technology, specially an application for multi-drive output circuit power source noise reduction method, mainly relates to the multi-drive output circuit power source noise reduction method. This application is one kind of the connection succession with 16 group strings transfers and constant current drive electric circuit. It has the following characteristic: the electric circuit input signal includes the data, the clock and the increase, the data signal value of electric circuit loading signal 1-16 clock signal before the rising edge in the rising edge time and memory, when the 1-16 clock signal after the loading signal falling edge drops in the rising edge, The electric circuit time sharing establishes 1-16 constant current drive states according to the memory value, each clock rising edge has only a constant current dirve condition to establish, that is to say each group drive output in a 1-n various time, according to the corresponding input condition data respectively changes to new states from the original states, each group drive output change time all receives the synchronized signal control, this method can effectively reduce power source transient state noise due to the greater electric current transient state change, thus, large scale promoted the data bandpass and promoted the power output which might realize.
Description
technical field [0001] The invention relates to a method for suppressing electrical noise of a multi-drive output circuit, in particular to a method for the interface timing characteristics of a 16-channel serial-to-parallel constant-current drive circuit. Background technique [0002] At present, in the existing multi-channel serial-parallel constant-current drive circuit design widely used in the market, the state setting time of all constant-current drives is the same, so that the instantaneous current of the circuit changes greatly, resulting in the disadvantage of large power supply noise. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a new type of timing sequence of a multi-channel serial-parallel constant-current drive circuit for the deficiencies in the prior art. [0004] The technical scheme of the present invention is: the input signal of the circuit includes data, clock and loading, the circuit collects and stores the valu...
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IPC IPC(8): G09G5/00H03K5/00
Inventor 邵寅亮徐微
Owner BEIJING ZHONGQING MICRO ELECTRIC TECH