APPARATUS FOR MEASURING AMPLITUDE-FREQUENCY AND PHASE-FREQUENCY CHARACTERISTICS OF AMPLIFIERS Russian patent published in 2013 - IPC G01R27/28 

FIELD: physics.

SUBSTANCE: result is achieved by adjusting and generating orthogonal output voltages of the test amplifier and controlled attenuator in a wide frequency range with subsequent conversion thereof from the Cartesian coordinate system to a polar coordinate system. The apparatus for measuring the amplitude-frequency and phase-frequency characteristics of amplifiers has a unit for generating quadrature signals 1, a rectangular pulse former 2, the test amplifier 3, a controlled phase changer 4, a saw-tooth voltage generator 5, a digital inverter 6, a device for automatic control of the transfer constant 7, a controlled attenuator 8, a short pulse former 9, a coordinate conversion unit 10, an amplitude detector 11, an RS flip-flop 12, a comparator 13, a first reference voltage source 14, a phase-determining unit 15, a second reference voltage source 16, an adder 17, a subtractor 18, a phase indicator 19, an amplitude indicator 20 and a dual-threshold comparator 21.

EFFECT: high accuracy of measuring amplitude-frequency and phase-frequency characteristics of an amplifier.

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