| 摘要 |
FIELD: physics, radio. ^ SUBSTANCE: invention relates to radio-measuring techniques, specifically to measurement of nonlinear distortions. The device consists of an operational amplifier (op-amp) with a negative feedback whose inverting input is connected to the output of a differential amplifier (DA), and the non-inverting input is connected to the terminal of the first potentiometre. A second op-amp has a negative feedback and its inverting input is connected to the other terminal of the first potentiometre, while the non-inverting input is connected to the connection point between the series and parallel branches of a Wien bridge. The outputs of the first and second operational amplifiers are connected to a second potentiometre whose sliding contact is the control output of the device for measuring nonlinear distortions. A third potentiometre is connected to the output of the differential amplifier and the input of the device for measuring nonlinear distortions and its sliding contact is connected to a device for measuring effective values. ^ EFFECT: preventing dependency of the value of phase shift on frequency in an amplifier - phase shifter. ^ 1 cl |
