| 摘要 |
A phase shifting circuit comprises: a pair of input terminals (I1, I2); a pair of output terminals (01, 02); a variable gain amplifying means (3) and an active alternating current integrator (1), connected in series between the input terminals and the output terminals; and control means (5, 7, 9) for controlling the gain of said amplifying means in dependence on the voltage between said input terminals and the voltage between said output terminals so as to maintain the amplitude of the voltage between said output terminals substantially equal to the amplitude of the voltage between said input terminals. The circuit exhibits low variation of phase shift with input signal frequency. <IMAGE> |
