| 摘要 |
PURPOSE:To enable to obtain f<1/2> AGC performance with high accuracy over wide band, by inserting the two terminal circuit approximating the distributed RC element with the lumped parameter RC elements to the flat amplifiers. CONSTITUTION:In the f<1/2> AGC circuit, the two terminal circuit 5 consisting of the eight lumped RC elements which approximates the distributed RC element is inserted between the pre-flat amplifier 2 and the post flat amplifier 4. Further, the change in the value of the variable resistor 3 changes the teansmission performance. Next, the amplifier are constituted with common collector sysem so that the input and output impedance of the amplifiers 2 and 4 can satisfy a certain condition, and moreover, the frequency response 50 of the f<1/2> AGC circuit when the impedance C4 and R4 of two terminal circuit is removed by taking into consideration the input impedance of the amplifier 4 is within + or - 0.1 dB deviation for the band 1 to 800 MHz at the corrective distance 200 m. |
