Circuit arrangement for measuring the phase modulation disturbance of a test signal
AssigneeSiemens Aktiengesellschaft
InventorsHelmuth Fink, Guenter Wess
Life of this patent
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Abstract
A circuit arrangement for measuring the phase modulation disturbance of a test signal which is passed through a test object and wherein a heterodyne oscillator supplies an input to a mixer which receives the input signal and supplies an output to a detector and display device and wherein the output of the mixer is applied to an automatic frequency control loop including a reference oscillator phase discriminator and a low pass filter which supplies an input to the frequency control input of the heterodyne oscillator.
Claims10
A circuit for detecting phase modulation disturbances of a signal, which has passed through a test object, in the carrier-frequency band comprising a carrier-frequency selective heterodyne receiver comprising a mixer receiving the incoming signal after it has passed through said test object, a band pass filter receiving the output of said mixer and passing an I.F. frequency, a voltage tunable heterodyne oscillator supplying an input to said mixer, a reference oscillator, a phase discriminator receiving a portion of said I.F. frequency and the output of said reference oscillator and producing an output voltage which is supplied to said voltage tunable heterodyne oscillator to adjust the frequency of said heterodyne oscillator, a first detector receiving a portion of the I.F. output of said band pass filter, and an evaluation device receiving the output of said first detector.
A circuit for detecting phase modulation disturbances of a signal, which has passed through a test object, in the carrier-frequency band comprising a carrier-frequency selective heterodyne receiver comprising a mixer receiving the incoming signal after it has passed through the test object, a band pass filter receiving the output of said mixer and producing an I.F. frequency, a voltage tunable heterodyne oscillator supplying an input to said mixer, a reference oscillator, a phase discriminator receiving the output of said reference oscillator and a portion of said I.F. frequency from said band pass filter and producing an output voltage which is supplied to said voltage tunable heterodyne oscillator to adjust its frequency, a first detector receiving a portion of the output of said band pass filter, and an evaluation device receiving the output of said first detector.
Dependencies are inferred from the claim text.