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Hybrid switched mode/linear power amplifier power supply for use in polar transmitter

A technology of power amplifier and switch mode, which is applied in the field of DC-DC converter power supply

Active Publication Date: 2009-11-11
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While a switching frequency of 5-10MHz would be technically very challenging (typical commercial DC-DC converters operate at a maximum switching frequency in the range of about 1-2MHz), for example a DC-DC converter with a switching frequency of 100MHz would be Currently impractical to implement, especially in low-cost, mass-produced devices such as cellular phones and personal communication terminals

Method used

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  • Hybrid switched mode/linear power amplifier power supply for use in polar transmitter
  • Hybrid switched mode/linear power amplifier power supply for use in polar transmitter
  • Hybrid switched mode/linear power amplifier power supply for use in polar transmitter

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Embodiment Construction

[0047] refer to Figure 5 , the present invention provides a hybrid voltage regulator or power supply 30 that combines a switching section 32 that preferably handles most of the power with high efficiency but low bandwidth and a smaller portion of the required power that is best handled with low efficiency but high bandwidth The linear part of 34. The resulting power supply has the required bandwidth and efficiency slightly lower than that of a pure switching power supply but still much higher than that of a pure linear regulator. The resulting hybrid power supply 30 provides an improved output voltage quality since the linear section 34 can be used to compensate for the output voltage ripple typically associated with a pure switching power supply. This is an important advantage since excess output voltage ripple can adversely affect the output spectrum of the PA 6.

[0048] It is to be noted that in principle the amount of power (x) handled by the switching section 32 is gr...

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Abstract

In one aspect, the invention provides a DC-DC converter having a switch-mode portion coupled between a DC source and a load, the switch-mode portion providing x amount of output power; and having a connection between the DC source and the load The switch mode section is coupled in parallel with the linear mode section, the linear mode section provides y amount of output power. x is preferably greater than y, and the ratio of x to y can be optimized for specific application constraints. In another aspect, the present invention provides an RF transmitter (TX) coupled to an antenna. The TX has a polar structure and includes an amplitude modulation (AM) path coupled to a power amplifier (PA) supply and a phase modulation (PM) path coupled to the PA input.

Description

technical field [0001] The present invention relates generally to DC-DC converter power supplies, and more particularly to switched-mode power supplies (SMPS) suitable for use in radio frequency (RF) transmitters, such as those used in cellular mobile stations implementing envelope recovery ( ER) RF transmitters RF transmitters, also known as polar transmitters, in which the sign is represented using phase and magnitude components, rather than complex in-phase / quadrature-phase (I / Q) components. Background technique [0002] Figure 1A is a simplified block diagram showing the structure of the ER transmitter (TX) 1 including the amplitude modulation (AM) chain and phase modulation (PM) chain. The bits to be transmitted are input to a bit-to-polarity converter 2, which outputs an amplitude signal via a propagation delay (PD) 3 to an amplitude modulator (AM) 4 . The AM 4 (after digital-to-analog conversion) provides a signal for controlling the output level of the TX power amp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/40H03F3/38
Inventor V·G·格里戈尔
Owner NOKIA TECHNOLOGLES OY
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