Tektronix AWG610 Instrukcja Użytkownika Pobierz pdf (Strona 175)

100

101

The Graphical Waveform Editor

AWG610 Arbitrary Waveform Generator User Manual

3-57

110

111110000

Tap

Output

1 Cycle

Bit 1 Bit 2 Bit 3

Figure 3-6: Register value and tap setting example

The following steps describe how the instrument generates the output waveform

values.

1. Output 1 of the rightmost bit.

2. Take XOR of the output value 1 and the Bit 2 value 0 (result is 1).

3. Shift the bit values one column to the right.

4. Assign the value 1 to Bit 1, which is the XOR value from Step 2. The new

array of the register values is 110.

5. Repeat steps 1 to 4, with 110 as the register value.

6. Repeating output of the rightmost bit of the register and the subsequent shift

of the register value results in the output values as shown in Figure 3–6. In

this example, the shift register output pattern starts to repeat after seven

cycles.

The data generated by the shift register is called an M Series. If n is defined as

the number of shift register bits, then the output pattern from the shift register

generator (M Series length) will begin to repeat after 2

– 1 cycles.

The Shift Register Generator dialog box lets you define the register length, initial

Figure 3–7 shows the dialog box, and Table 3–11 describes the dialog box

parameters.

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 465 466

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