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US 5,489,877 AGranted
Broadband amplifier having uniform frequency response
AssigneePico Products, Inc.
InventorsMarc Yacoubian, Edward Rosen, Norman F. Reinhardt
Life of this patent
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AssigneePico Products, Inc.
InventorsMarc Yacoubian, Edward Rosen, Norman F. Reinhardt
Estimating the term…
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.
In an amplifier circuit, the circuit including an input network, an amplifier device, and an output network, the amplifier device having a scattering parameter s.sub.22 which corresponds to output impedance of the amplifier device, the scattering parameter being a complex number,
In an amplifier circuit, the circuit including an input network, an amplifier device, and an output network, the input and output networks being connected to opposite sides of the amplifier device,
A method of designing a broadband amplifier circuit, the amplifier circuit being operable over a frequency range having a lower limit and an upper limit, the amplifier circuit including an input network, an amplifier device, and an output network, the input and output networks being connected to input and output ends of the amplifier device, the amplifier device having a scattering parameter denoted s.sub.22, the amplifier circuit having a system impedance, the method comprising the steps of:
A method of designing a broadband amplifier circuit, the amplifier circuit being operable over a given frequency range, the amplifier circuit including an input network, an amplifier device, and an output network, the input and output networks being connected to input and output ends of the amplifier device, the method comprising the steps of:
Dependencies are inferred from the claim text.