many systems still use analog circuit adjust the transmission time

    In addition to the use of digital circuit mode, many systems still use analog circuit adjust the transmission time: laptop battery baseband code sent via analog trigger circuit, and ranging error control via analog baseband code trigger circuit transmission time. In this way, in theory, the step of adjusting transmission timing is smaller, but compared with the digital circuit, easily affected by temperature, noise, and other factors, the reliability is much less. The proposed method is implemented with a digital way, stability and reliability has incomparable superiority.

    This design of the shaping filter full use of the hardware resources left in the ROM, the logical unit takes up very little. The shaping filter is composed of a shaping filter set can be Baseband transmission time step size is reduced to a fraction of the clock cycle, or one of a dozen points, thus greatly improve the accuracy of the transmission timing adjustment . This design has been applied to a ranging system, laptop battery has achieved good results. This design can also be applied in many other ranging systems, such as positioning systems, secondary radar, etc., so a higher practical value.

the ROM output filter result is C code baseband filtering result value intermediate code. the calculated E R falls in a range which. Select the sub-interval waveform, the waveform to the sub D / A converter into an analog waveform and then outputs the notebook battery can adjust the transmission time of the clock cycle steps down to 1 / E. the system clock frequency is 20MHz, so the code 2MHz baseband interpolation between adjacent bits "0", then step (C preferably 5) of the FIR filter shaping filter device can be achieved. the waveform value of quantization bits, each base band code number of sampling points clocks of other factors.

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