Amplifiers – With semiconductor amplifying device – Including frequency-responsive means in the signal...
Patent
1994-06-30
1995-07-18
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including frequency-responsive means in the signal...
330254, 455255, H03F 3191
Patent
active
054345413
ABSTRACT:
A frequency translated filter adapted for integration into a conventional monolithic integrated circuit arrangement. The filter includes an RF amplifier having a gain determining port; a one port, AF (audio frequency), frequency selective, gain determining immittance network; a forced-commutated bridge of bilateral switching elements interconnecting the immittance network and the gain affecting port of the amplifier, and an RF local oscillator for providing a commutating drive signal to the bridge. The action of the RF commutating bridge is to convert the voltage and current appearing at the gain affecting port of the RF amplifier to a low frequency at the terminals of the AF immittance network, and to reflect the immittance of the AF network back through the RF commutating bridge, translating it up again in frequency. The effect is to permit the use of AF frequency selective elements to render an amplifier frequency selective at radio frequencies.
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J. Y.-C. Chang, Asad A. Abidi, and Michael Gaitan, "Large Suspended Inductors on Silicon and Their Use in a 2-lm COS RF Amplifier," IEEE Electron Device Letters, vol. 14, No. 5, May 1993, pp. 246-248.
AT&T Corp.
Mullins James B.
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