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Title:
POWER AMPLIFIER
Document Type and Number:
Japanese Patent JP2000216642
Kind Code:
A
Abstract:

To accurately adjust a gradient amplifier of a nuclear spin tomograph, by giving a accurate end stage switching time interval to current flow which is generated in a induction load connecting with a out put of a power amplifier.

In the power amplifier having a power bridge circuit including a predetermined number of switching elements SE1-SE4, at least a switching terminal stage E connected to an intermediate circuit with no voltage, and at least one digital pulse width modulator DPWM that generates pulse-width- modulated control signals S1-S4 to all the switching elements SE1-SE4 of the power bridge circuit receiving digital input signals IN, N-IN in order to produce at least one ffinal stage voltage UE according to a final stage switching clock, pre-stage modulators PM1, PM2 to form the digital input signals IN, N-IN are connected before the digital pulse width modulator DPWM, and at least either of the digital input signals IN, N-IN includes an offset equivalent preferably to a half LSB.


Inventors:
LENZ HELMUT
Application Number:
JP1999000353559
Publication Date:
August 04, 2000
Filing Date:
December 13, 1999
Export Citation:
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Assignee:
SIEMENS AG
International Classes:
H05G1/10; A61B5/055; G01R33/385; H03F3/217; H03K7/08; (IPC1-7): H03F3/217; H03K7/08; H05G1/10
Attorney, Agent or Firm:
山口 巖