Method and system for matching the input impedance of an RF ampl

Details Method and system for matching the input impedance of an RF ampl Method and system for matching the input impedance of an RF ampl

1997-02-28

1999-06-22

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

455291, 455341, H03F 134

Patent

active

059146400

ABSTRACT:
A low noise RF input amplifier circuit has an input impedance Z.sub.IN for matched-impedance coupling to an antenna having a resistive impedance R.sub.A. The amplifier circuit has an input and output nodes, an inverting amplifier, and a feedback capacitor. The input node receives an antenna signal which the inverting amplifier amplifies by a frequency-dependent gain -A(s) approaching -A.sub.0 at low complex frequencies s. The feedback capacitor C couples the output node to the input node for negative feedback and is selected to match Z.sub.IN to R.sub.A. When the amplifier's gain A(s) has a rolloff approximated by ##EQU1## where p.sub.1 is a negative pole, the capacitance of C which matches Z.sub.IN to R.sub.A is approximately inversely proportional to both (A.sub.0 +1) and R.sub.A.

REFERENCES:
patent: 4414690 (1983-11-01), Nordholt et al.
patent: 4484147 (1984-11-01), Metz
patent: 5159289 (1992-10-01), Zametzer et al.
patent: 5488382 (1996-01-01), Fenzi et al.

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