Differential radio

• US 20030092408A1
• Filed: 11/13/2001
• Published: 05/15/2003
• Est. Priority Date: 11/13/2001
• Status: Active Grant

• Current Assignee: Avago Technologies Wireless IP Singapore Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies Wireless IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Frank, Michael L.
• Granted Patent: US 7,031,689 B2
• Time in Patent Office: Days
• US Class Current: 455/130
• CPC Class Codes: H04B 1/40 Circuits

Abstract

A cellphone handset may be excited in a completely differential mode. The antenna, e.g. a simple dipole or a minimal Yagi-Uda with a reflector, may be printed into the printed circuit board. A differential duplexer may be implemented using FBAR technology. The LNA (Low Noise Amplifier) and the PA (Power Amplifier) can both be differential.

Claims

1. A differential radio comprising:

a differential antenna having an input and an output;

a differential duplexer, generating two receiving signals and receiving two transmitting signals, electrically connected to the input and output of the differential antenna;

a differential low noise amplifier, receiving the two receiving signals, generating two LNA signals;

a first differential filter receiving the two LNA signals and generating a first differential filter signal;

a first differential mixer receiving the first differential signal and generating a first differential mixer output signal;

a signal conditioning circuit, receiving the first differential mixer output signal, generating a conditioned differential signal;

a second differential mixer, receiving the conditioned differential signal, generating a second differential mixer output signal;

a second differential filter, receiving the second differential mixer output signal, generating a second differential filter signal; and

a differential power amplifier receiving the second differential filter signal and generating the two transmitting signals.

2. A differential radio as in claim 1, wherein the duplexer is an FBAR.

3. A differential radio as in claim 1, wherein the differential antenna is a Yagi-Uda.

4. A differential radio as in claim 3, wherein the differential antenna is incorporated into a printed circuit board.

5. A differential radio as in claim 1, the differential power amplifier comprising:

an input matching network having a differential input and a first and second IMN output;

a first field effect transistor (FET), having a gate connected to the first IMN output;

a first capacitor, connected to the drain of the first FET;

a second FET, having a gate connected to the first capacitor;

a third FET, having a source connected to the source of the second FET at a first node;

an output matching (OMN), having a first input connecting to the drain of the second FET and a second input connecting to the drain of the third FET;

a first inductor connecting between the first node and ground;

a second capacitor connected to the gate of the third FET;

a fourth FET having a drain connected to the second capacitor, a gate connected to the second IMN output, a source connected to the source of the first FET at a second node; and

a second inductor connects between node B and ground.

6. A differential radio as in claim 5, wherein the duplexer includes film bulk acoustic resonators.

7. A differential radio as in claim 5, wherein the differential antenna is incorporated into a printed circuit board.