Modulators – Amplitude modulator – Suppressed carrier double sideband type
Patent
1994-07-29
1995-07-25
Grimm, Siefried H.
Modulators
Amplitude modulator
Suppressed carrier double sideband type
324314, 327105, 332170, H03B 2800, H03C 152, H03C 160, G01R 3324
Patent
active
054366003
ABSTRACT:
A local frequency generator employing a single crystal oscillator, latches and direct digital synthesizer circuits digitally produces all signals needed in the transmitter channel of a MRI system to generate MRI transmitter RF pulses. The local frequency generator is operable in both the single side band and double side band modes and has the capability of switching between the modes. The generator is constructed with a phase resetting capability for providing the plural output frequencies needed for making plural MRI slices.
REFERENCES:
patent: 4908578 (1990-03-01), Van Liere
patent: 4992743 (1991-02-01), Sheffer
patent: 4998072 (1991-03-01), Sheffer
patent: 5162763 (1992-11-01), Morris
Holland et al, "an Overview of Digital Spectrometers for MR Imaging", SMRI REPORT, pp. 241-246, Mar./Apr. 1992.
"Q2334 Dual Direct Digital Synthesizer Technical Data Sheet", QUALCOMM INCORPORATED, Jun. 1988, pp. 1-19.
Arakawa Mitsuaki
Crooks Lawrence E.
Furui Keiji
Hoenninger, III John C.
McDermott Thomas
Grimm Siefried H.
The Regents of the University of California
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