Method and apparatus for low-frequency bypass in broadband...

Details Method and apparatus for low-frequency bypass in broadband... Method and apparatus for low-frequency bypass in broadband...

2007-05-22

2007-05-22

Choe, Henry (Department: 2817)

Amplifiers

With plural amplifier channels

Amplifying different frequencies in different channels

C330S151000

Reexamination Certificate

active

11146766

ABSTRACT:
A method of processing an input broadband signal in RF circuitry includes extracting low-frequency components from the input broadband signal, processing the low-frequency components in low-frequency bypass circuitry, and adding the processed low-frequency components to the output of the RF circuitry to produce a combined output signal. Low-frequency bypass amplifier circuitry for bypassing RF circuitry includes a capacitor having a first terminal for receiving an input signal and a second terminal for connecting to an input of the RF circuitry, and a differential amplifier having two inputs respectively connected to the two terminals of the capacitor, and an output connected to an output of the RF circuitry. High-frequency components of the input signal pass through the capacitor and the RF circuitry, and low-frequency components pass through the differential amplifier and are added to the output of the RF circuitry to produce a combined output signal. The low-frequency bypass circuitry has an amplification which matches with the amplification of the RF circuitry, such that the combined output signal is not distorted from the input signal.

REFERENCES:
patent: 3622898 (1971-11-01), Salmon
patent: 4284965 (1981-08-01), Higashi et al.
patent: 6600388 (2003-07-01), Hershtig
patent: 7049886 (2006-05-01), Kim et al.

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