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US 7,031,689 B2Granted
Differential radio
OwnerMichael L. Frankinventor
Life of this patent
Estimating the term…
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.
Claims2
A differential radio comprising:
- a differential antenna having an input and an output;
- a differential duplexer including film bulk acoustic resonators, generating tow 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, including,
- an input matching network (IMN) having a differential input and a first and second 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;
- an output matching network (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 source of the second FET 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;
- and
- a second inductor connects between the source of the first FET and ground;
- a 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, processing section, 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.
17 more elements
Dependencies are inferred from the claim text.