Elmo SERVO AMPLIFIER DBP SERIES - Manual (Page 92)

91
DBP - Rev 6/93
R201 = 5.92 x 10
7
/ T x p (Kohm)
where p = bit per rev
= 1,024 for 10 bits resolution
= 4,096 for 12 bits
= 16,384 for 14 bits
= 65,536 for 16 bits
Closed Loop Bandwidth Selection (C67, C68, R200)
a. Choose the Closed Loop 3dB Bandwidth (f bw) required ensuring that
fref > 10 x fbw
Recommended bandwidth values:
250Hz for 3KHz
300Hz for 5KHz
500Hz for 10KHz
b. Select C67 so that
2.5x10
9
C67 = ------------- (pF)
R201 x fbw
2
with R201 in Kohm and f bw in Hz as selected above.
c. C68 is given by
C68 = 40 x C67 (pF)