Mikhail A Nikolaev

US Patent:

7221220, May 22, 2007

Filed:

Jun 7, 2005

Appl. No.:

11/146766

Inventors:

Anatoli B. Stein - Atherton CA, US
Mikhail Nikolaev - Palo Alto CA, US

Assignee:

Guzik Technical Enterprises - Mountain View CA

International Classification:

H03F 3/68

US Classification:

330126, 330151

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.