Circuit arrangement for switching a mobile radio transmitter between two modulation modes

• US 7,050,772 B2
• Filed: 05/02/2003
• Issued: 05/23/2006
• Est. Priority Date: 05/29/2002
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Siemens AG
• Inventors: Herzberg, Ralf, Nagel, Jörg
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): THIER, MICHAEL
• Application Number:
  US10/485,405
• Publication Number:
  US 20040180639A1
• Time in Patent Office: 1,117 Days
• Field of Search: 455/102, 455/108, 455/110, 455/126, 455/127.4, 455/552.1
• US Class Current: 455/191.3
• CPC Class Codes: H04B 1/04 Circuits
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A circuit is provided for regulating operation of a transmitter of a mobile communication terminal, which runs in the EDGE and GMSK modulation modes. The inventive circuit includes a power amplifier supplying an output signal for an antenna of the mobile communication terminal; a phase regulator that is provided with a phase comparator to which a setpoint signal for the output signal of the power amplifier is fed, and a voltage-controlled oscillator adjusting the phase position of the output signal of the power amplifier, the phase regulator regulating the phase position of the output signal of the power amplifier; an amplitude-regulating device that is provided with an amplitude comparator to which the setpoint signal for the output signal of the power amplifier is fed, and a battery-powered battery-voltage modulator adjusting the amplitude of the output signal of the power amplifier, the amplitude-regulating device regulating the amplitude of the output signal of the power amplifier; and a feedback line feeding an actual measured value for the output signal of the power amplifier back to the phase comparator and the amplitude comparator, the feedback line being provided with an adjustable amplifier which is controlled by a baseband chip and sets an output power of the antenna. The inventive circuit includes a changeover switch which is wired in such a way that it connects an input of the battery-voltage modulator to an output of the amplitude comparator in a first position for the EDGE mode while connecting an input of the battery-voltage modulator to an output of the power amplifier in a second position for the GMSK mode, the connection being made via the adjustable amplifier in both positions.

Claims

1. A circuit for controlling operation of a transmitter in a mobile communication terminal, the transmitter being designed for both EDGE and GMSK modulation modes, the circuit comprising:

a power amplifier for delivering an output signal, via an output of the power amplifier, for an antenna on the mobile communication terminal;

a phase controller for controlling a phase of the output signal from the power amplifier, wherein the phase controller includes a phase comparator with an input to which a nominal signal for the output signal from the power amplifier is supplied, and further including a voltage controlled oscillator for aligning the phase of the output signal from the power amplifier;

an amplitude controller for controlling an amplitude of the output signal from the power amplifier, wherein the amplitude controller includes an amplitude comparator to which the nominal signal for the output signal from the power amplifier is supplied, and further including a battery voltage modulator, powered by a battery, for aligning the amplitude of the output signal from the power amplifier;

a feedback line for feeding back a present measured value for the output signal from the power amplifier to both the phase comparator and the amplitude comparator, wherein the feedback line includes an adjustable amplifier, controlled by a baseband chip using a control signal, for setting an output power for the antenna; and

a changeover switch for connecting an output on the amplitude comparator to an input on the battery voltage modulator in a first position for the EDGE modulation mode, and for connecting the control signal for the adjustable amplifier directly to the input of the battery voltage modulator in a second position for the GMSK modulation mode.

2. A circuit for controlling operation of a transmitter in a mobile communication terminal as claimed in claim 1, wherein the adjustable amplifier raises and lowers the amplitude of the output signal from the power amplifier.

3. A circuit for controlling operation of a transmitter in a mobile communication terminal as claimed in claim 1, further comprising a second changeover switch for connecting the output of the power amplifier to the input of the phase comparator in a first position, and for connecting an output of the voltage controlled oscillator to the input of the phase comparator in a second position.

4. A circuit for controlling operation of a transmitter in a mobile communication terminal as claimed in claim 3, wherein the second changeover switch is in the first position for the EDGE modulation mode.

5. A circuit for controlling operation of a transmitter in a mobile communication terminal as claimed in claim 3, wherein the second changeover switch is in the second position for the GMSK modulation mode.