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Dynamic power supply for polarity modulated and envelope tracking transmitters

A technology of dynamic power supply and linear regulator, which is applied in the direction of adjusting electrical variables, power supply voltage change control, instruments, etc., and can solve problems that are not easy to implement

Pending Publication Date: 2022-04-12
ERIDAN COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, it is not easy to design a parallel DC-DC converter / linear regulator DPS capable of operating with such precision and high efficiency over such a wide bandwidth

Method used

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  • Dynamic power supply for polarity modulated and envelope tracking transmitters
  • Dynamic power supply for polarity modulated and envelope tracking transmitters
  • Dynamic power supply for polarity modulated and envelope tracking transmitters

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0022] refer to Figure 4 , shows a dynamic power supply (DPS) 400 according to one embodiment of the present invention. DPS 400 includes a DC-DC converter 402 connected in series with a linear amplitude modulator (LAM) 404 which in turn includes an operational amplifier (opamp) 406 and a pass transistor 408 .

[0023] Figure 5 is a block diagram of DPS 400 showing how DC-DC converter 402 includes high power buck switching stage 502 and energy storage and damping network 504 , and how DPS 400 further includes controller 506 . The controller 506 includes a pulse width modulator (PWM), or in another embodiment of the invention a pulse density modulator (PDM), which generates the drive signals used to drive the power transistors in the high power buck switching stage 502 . The controller 506 modulates the pulse width or pulse density of the drive signal according to the input envelope voltage Venv, depending on whether PWM or PDM is used, and, as will be explained in more detai...

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PUM

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Abstract

A dynamic power supply (DPS) for a polarity modulated transmitter and an envelope tracking (ET) transmitter includes a direct current (DC)-DC converter, a linear amplitude modulator (LAM) connected in series with the DC-DC converter, and a controller that dynamically controls switching of the DC-DC converter and an amplitude of a reference voltage of the LAM as a function of a time-varying variation of an input envelope voltage Venv. The DC-DC converter includes a high power buck switching stage and an output energy storage network having a third order or higher order low pass filter (LPF). The third order or higher order LPF filters switching noise and ripple from the switching voltage generated by the high power buck switching stage, and in one embodiment of the invention adds a damping network that eliminates undesired ringing at the power supply input of the LAM, thereby improving efficiency and DPS conversion accuracy.

Description

Background technique [0001] Dynamic power supplies (DPS) are used in modern radio frequency (RF) transmitters, especially polar modulation transmitters and envelope tracking ET transmitters, to help improve energy efficiency. In polar modulation transmitter 100 (see figure 1 ), the PA 102 of the polar-modulated transmitter includes an energy-efficient non-linear PA (e.g., a Class E or Class F switch-mode PA) that will "signal envelope" carried by the DPS voltage VDD(t) generated by its DPS 106 ” modulated to the polar modulated transmitter’s RF output RF OUT superior. ET transmitter (see figure 2 ) The DPS voltage VDD(t) also tracks the input signal envelope voltage Venv. However, unlike the polar modulation transmitter 100, the ET transmitter 100 employs a linear PA 202 (eg, a Class A, Class B, or Class AB linear PA) that does not operate as a modulator. Instead, the linear PA 202 acts as a controlled current source, and the DPS voltage VDD(t) of the ET transmitter 200 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/00G05F1/575G05F1/565
CPCH03G3/004G05F1/565G05F1/575H03G3/3042G05F1/468H03F1/0227H03F3/19H03F3/24H03F2200/451
Inventor W·戈迪基
Owner ERIDAN COMM