
104 Analog Circuits Cookbook
CMRR, even after removing the 100 nF capacitor decoupling the negative
rail.
This should have made things worse, not better. But then one must
expect such oddities when using experimenter's plug board construction.
The manufacturer's figure for the CHs 154 minimum at 40 MHz. If we
assume that CHs proportional to frequency, the 'measured' CHs 138. But
the manufacturer's figure of 154 is with the slug fitted, at mid-range, giving
an inductance of 207 nH, so at 154 nH without the slug, a lower value of
CHs only to be expected. In fact, the results from the bird's nest test bed are
so encouraging that the circuit wil ...