Broadband amplifier having uniform frequency response

Details Broadband amplifier having uniform frequency response Broadband amplifier having uniform frequency response

1995-10-26

1997-08-12

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330306, H03F 360

Patent

active

056569734

ABSTRACT:
A broadband amplifier includes an amplifier device and input and output networks formed of microstrips. The impedance of the output microstrip is chosen by taking the geometric mean of the real parts of one of the scattering parameters of the amplifier device, at the lower and upper limits of the frequency range of interest, and by taking the geometric mean of the system impedance with the result obtained previously. The final result of these calculations is the impedance of the output network. The impedance of the input network is made to be at least twice, and preferably twice, the impedance of the output network. The amplifier is also provided with a slope compensation circuit. It has been discovered that an amplifier designed in this manner exhibits remarkable flatness over a five-octave range. The amplifier circuit is therefore suitable for use in cable television and other broadband telecommunications applications, where the frequency range of interest may be 30 MHz to 1000 MHz.

REFERENCES:
patent: 4053842 (1977-10-01), Turski et al.
patent: 4638261 (1987-01-01), McGuire et al.

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