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Programmable multi-channel amplitude and phase shifting circuit

  • US 7,728,576 B1
  • Filed: 01/07/2004
  • Issued: 06/01/2010
  • Est. Priority Date: 01/07/2004
  • Status: Expired due to Fees
First Claim
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1. An inexpensive, programmable, frequency independent, amplitude and phase shifting circuit comprising:

  • an enclosure comprising;

    means for holding printed circuit boards; and

    a front panel for receiving input and output signals;

    a motherboard comprising;

    means for supplying input signals through said front panel;

    a power source;

    digital control lines; and

    a demultiplexer circuit board;

    said demultiplexer circuit board within said motherboard comprising;

    a demultiplexer;

    a plurality of signal receiving digital control lines coupled to the demultiplexer from a digital output card in a personal computer;

    a plurality of signal sending digital control lines coupled to the demultiplexer routed to an amplitude/phase shifting circuit board; and

    means for selecting a single amplifier for operator selected amplitude or phase gain change over a single frequency or sweep in frequency;

    an amplitude/phase shifting circuit board comprising;

    a plurality of programmable gain operational amplifiers each including a plurality of data input lines and a select line, independent of the data input lines, one amplifier selected at a time through the select line, to have its gain/and or phase changed when an operator desires a new amplitude and/or phase, each of the programmable gain operational amplifiers further including a first input signal line to receive a sine signal waveform and a second input signal line to receive a cosine signal waveform each of the sine and cosin signal waveforms are of the same frequency;

    a plurality of summing operational amplifiers, coupled to the plurality of programmable operational amplifers, to sum the sine signal waveform and cosine signal waveform;

    a plurality of output signal lines, coupled to the plurality of summing gain operational amplifiers, each output signal line to transmit a phase and/or amplitude shifted sinusoidal signal waveform having the same frequent as the summed sine signal waveform and cosine signal waveform; and

    means for controlling said amplitude/phase shifting circuit.

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