US 2013/0171954 A1 · RECEIVER INCLUDING A TRACKING FILTER

Abstract

A receiver includes a low noise amplifier having an input for receiving a radio frequency signal, and an output. The receiver further includes a tracking Filter having an input coupled to the output of the low noise amplifier. The tracking filter including a bandpass filter configured to pass the radio frequency signals. The bandpass filter includes a variable capacitor having a first electrode coupled to the input of the tracking filter for receiving the radio frequency signals, and a second electrode coupled to a power supply terminal. The bandpass filter further includes a transformer having a primary winding including a first terminal coupled to the first electrode of the variable capacitor and a second terminal coupled to a second power supply terminal. The transformer further includes a secondary winding.

Claims20

Dependent claims

A receiver comprising:

a low noise amplifier including an input for receiving a radio frequency signal and including an output;
and
a tracking filter having an input coupled to the output of the low noise amplifier, the tracking filter including a bandpass filter configured to pass the radio frequency signals, the bandpass filter comprising:
a variable capacitor including a first electrode coupled to the input of the tracking filter for receiving the radio frequency signals, and a second electrode coupled to a power supply terminal;
and
a transformer including a primary Winding having a first terminal coupled to the first electrode of the variable capacitor and a second terminal coupled to a second power supply terminal, the transformer further including a secondary winding.

3 more elements

Dependencies are inferred from the claim text.

Receiver including a tracking filter

Life of this patent

Receiver including a tracking filter

Life of this patent

Abstract

Claims20