TB2110FN 데이터 시트보기 (PDF) - Toshiba

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TB2110FN

TOSHIBA Bi−CMOS Integrated Circuit Silicon Monolithic

Toshiba 

TB2110FN

○ Phase comparator

The phase comparator compares the phase difference between the reference frequency signal fed from the

reference frequency divider and the divided output from the programmable counter, and outputs the difference.

In this way it controls the VCO through a low-pass filter to ensure that the frequencies and the phases of these

two signals are matched to each other.

Because this phase comparator has two tri-state buffers DO1 and DO2 connected in parallel as its outputs, you

can design the optimum filter constant for each of the FM and AM bands.

Furthermore, you can use the DOHZ bit of register D2 to place the DO2 output in a high-impedance state as

necessary.

Shown above is a DO output timing chart and a typical active low-pass filter circuit based on a darlington

connection of FET and bipolar transistors.

The filter circuit shown above is just one example. When designing the actual circuit, consider the band

configuration and the desired characteristics of your system.

11

2002-10-30

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