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US 4,341,999 AGranted
High accuracy phase shift control system
AssigneeEaton Corporation
InventorsRonald M. Rudish, Peter J. McVeigh
Life of this patent
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Abstract
The phase shift imparted to a signal is accurately controlled by passing the signal through a phase shifter in which the phase shift is adjusted by an automatic feedback control circuit. The control circuit senses the actual phase through the phase shifter and combines this information with a signal representing the desired phase to generate a control signal for the phase shifter.
Claims6
Apparatus for accurately controlling the phase of a first signal comprising:
- (a) means for shifting the phase of the first signal, said means for shifting having an input, an output and a control port, the first signal being applied to the input port and extracted from the output port with a phase shift determined by a second signal, which is applied to the control port,
- (b) first means for sampling a portion of the first signal, connected to the input port of said means for shifting the phase,
- (c) second means for sampling a portion of the first signal connected to the output of the means for shifting the phase,
- (d) means for sensing phase having a first and second input port and an output port, the first input port being connected to the first means for sampling while the second input port is connected to the second means for sampling to accept and determine the phase difference between the sampled signals and produce at the output port of the means for sensing phase the second signal related to the phase difference of the sampled signals,
- (e) second phase shifting means designated the reference phase shifting means having an input port and output port and a control port, the second phase shifting means connected in series between one of the sampling means and the phase sensing means to shift the phase of one of the sampled signals in accordance with an independent fourth signal applied to the control port of the reference phase shifting means, and
- (f) means for applying said second signal from the output of the means for sensing phase to the control port of the first means for shifting the phase to drive the first phase shifting means to the phase angle of the reference phase shifting means.
3 more elements
Apparatus for accurately controlling the phase of a first signal comprising:
- (a) means for shifting the phase of the first signal, said means for shifting having an input, an output and a control port, the first signal being applied to the input port and extracted from the output port with a phase shift determined by a second signal, which is applied to the control port,
- (b) first means for sampling a portion of the first signal connected to the input port of the means for shifting the phase,
- (c) second means for sampling a portion of the first signal connected to the output of the means for shifting the phase,
- (d) phase sensing means having a first and second input ports and an output port, the first input port being connected to the first means for sampling while the second input port is connected to the second method for sampling to accept and determine the phase difference between the sampled signals and produce at the output port of the phase sensing means a third signal related to the phase difference of the sampled signals, and
- (e) means for subtracting two signals, said means for subtracting having two input ports and an output port and accepting at one input port an independent signal designated the command signal which indicates the desired phase of the means for shifting the phase, and accepting at the second input port the third signal indicating the present phase of the means for shifting the phase to produce at the output port of the means for subtracting the second signal which is applied to the control port of the means for phase shifting to drive it to the desired phase.
2 more elements
Dependencies are inferred from the claim text.