publications

Figure 1.5:
Sideband Suppression

"... the sideband suppression as measured using a typical audio frequency of 4 kHz is plotted for eight several scanner frequencies spanning the ESI phantom's operational range characterisation test 3 above.

Again a very high suppression of approximately 53 dB is obtained over the operational range of the phantom. The slightly lower suppression observed at 2 MHz is due to a fractionally higher inductance used in the parallel tuned phasing circuit causing imperfect quadrature phase shifting. This has since been rectified by changing to a lower inductance coil for this filter."