US 7,031,676 B2 · Radio frequency transmitter having translational loop phase equalization

Abstract

A Radio Frequency RF transmitter includes a translational loop architecture that supports non-constant envelope modulation types and includes by adjusting the envelope of the translational loop at the translational loop output. The RF transmitter includes a phase equalizer, an Intermediate Frequency (IF) modulator, a translational loop, an envelope time delay adjust block, an envelope adjust block, and a time delay calibration block. The phase equalizer receives a modulated baseband signal and phase equalizes the modulated baseband signal to produce a phase equalized modulated baseband signal. The IF modulator receives the phase equalized modulated baseband signal and produces a modulated IF signal having a non-constant envelope. The translational loop receives the modulated IF signal and produces a modulated RF signal having a constant envelope. The envelope time delay adjust block receives an envelope signal corresponding to the original modulated signal and produces a time delayed envelope signal based upon a time delay control signal. The envelope adjust block adjusts the modulated RF signal based upon the time delayed envelope signal to produce an envelope adjusted modulated RF signal. Finally, the time delay calibration block receives the envelope adjusted modulated RF signal and produces the time delay control signal.

Claims48

Dependent claims

A Radio Frequency (RF) transmitter comprising:

a phase equalizer that receives a modulated baseband signal and that produces a phase equalized modulated baseband signal;
an Intermediate Frequency (IF) modulator that receives the phase equalized modulated baseband signal and that produces a modulated IF signal having a non-constant envelope;
a translational loop that receives the modulated IF signal and that produces a modulated RF signal having a constant envelope;
an envelope time delay adjust block that receives an envelope signal corresponding to the modulated IF signal and that produces a time delayed envelope signal based upon a time delay control signal;
an envelope adjust block that adjusts the modulated RF signal based upon the time delayed envelope signal to produce an envelope adjusted modulated RF signal;
and
a time delay calibration block that receives the envelope adjusted modulated RF signal and that produces the time delay control signal.

4 more elements

A wireless device comprising:

a case;
an antenna coupled to the case;
a baseband processor disposed within the case;
a Radio Frequency (RF) unit disposed within the case, coupled to the baseband processor, coupled to the antenna and having an RF transmitter comprising:
a phase equalizer that receives a modulated baseband signal from the baseband processor and that produces a phase equalized modulated baseband signal;
an Intermediate Frequency (IF) modulator that receives the phase equalized modulated baseband signal and that produces a modulated IF signal having a non-constant envelope;
a translational loop that receives the modulated IF signal and that produces a modulated RF signal having a constant envelope;
an envelope time delay adjust block that receives an envelope signal corresponding to the modulated IF signal and that produces a time delayed envelope signal based upon a time delay control signal;
an envelope adjust block that adjusts the modulated RF signal based upon the time delayed envelope signal to produce an envelope adjusted modulated RF signal;
and
a time delay calibration block that receives the envelope adjusted modulated RF signal and that produces the time delay control signal.

8 more elements

A method for producing a modulated RF signal having a non-constant envelope, the method comprising:

receiving a modulated baseband signal;
phase adjusting the modulated baseband signal to produce a phase equalized modulated baseband signal;
converting the phase equalized modulated baseband signal to a modulated IF signal having a non-constant envelope;
converting the modulated IF signal to a modulated RF signal having a constant envelope using a translational loop;
receiving an envelope signal corresponding to the modulated IF signal;
producing a time delayed envelope signal based upon a time delay control signal;
adjusting the modulated RF signal based upon the time delayed envelope signal to produce an envelope adjusted modulated RF signal that has a non-constant envelope;
and
producing the time delay control signal based upon the envelope adjusted modulated RF signal.

6 more elements

Dependencies are inferred from the claim text.

Radio frequency transmitter having translational loop phase equalization

Life of this patent

Radio frequency transmitter having translational loop phase equalization

Life of this patent

Abstract

Claims48