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Resonant power converter and method for wireless radio frequency transmission

A power converter, resonator technology, applied in the field of radio frequency signals

Inactive Publication Date: 2014-10-01
STMICROELECTRONICS SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016]As stated earlier, the application of the basic concept of the delta-sigma modulator has not led to a tenable solution to the aforementioned problems

Method used

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  • Resonant power converter and method for wireless radio frequency transmission
  • Resonant power converter and method for wireless radio frequency transmission
  • Resonant power converter and method for wireless radio frequency transmission

Examples

Experimental program
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example 1

[0083] Example 1: Returning to the embodiment in Fig. 3, we select L 1 = 1 and L 2 =4. We also set the phase offset θ = 0 within the arguments of cos( ) and sin( ) driving the synchronous and quadrature modulators. data sample {i k} is the kth sample from the synchronous encoder 302a, similarly, the data sample {q k} is the kth sample from quadrature encoder 302b. Use a frequency of 4F c of clock pulses, which is higher than the carrier frequency F c 4 times higher, the samples from the encoder are effectively sampled and held 4 consecutive times by the interpolator 318 until the next kth sample arrives. Synchronous and quadrature modulator 320 is effectively an arithmetic multiplier. Each multiplier has two inputs and an output. The synchronous modulator 320a receives the synchronous samples from the interpolator 318a and also receives a periodic sequence {1, 0, -1, 0} which is the result of the trigonometric operation cos(2πn / 4), each carrier period with a carrier fr...

example 2

[0084] Example 2: Same as Example 1 above, we choose L 1 = 1 and L 2 =4. This time however we set the phase offset θ = π / 4 within the arguments of cos( ) and sin( ) driving the synchronous and quadrature modulators. Note that it is important to set the phase offset to θ=π / 4 in some cases. In particular, CDMA standards IS-95, IS-95a, IS-98 and IS-2000 require π / 4 offset quadrature phase shift keying as a modulation scheme. Those with common sense in the field of data modulation know that using π / 4 offset quadrature phase shift keying instead of zero offset is beneficial in reducing the peak-to-average ratio otherwise used as a crest factor. Returning to the operation mentioned above, the data sample {i k} is the kth sample from the synchronous encoder 302a, similarly, the data sample {q k} is the kth sample from quadrature encoder 302b. Using a clock pulse with a frequency of 4Fc, which is 4 times higher than the carrier frequency Fc, the samples from the encoder are effe...

example 3

[0087] Example 3: As in Example 2 above, L 1 = 1, L 2=4 and θ=π / 4. But in the noise reshaping coder 302 3D quantization is used. Therefore, there are nine possible data sequences per carrier cycle, and the layout diagram will include a matrix of nine symbol points according to the following I-Q coordinate system: (1,0), (1,1), (0, 1), (-1, 1), (-1, 0), (-1, -1), (0, -1), (1, -1), and (0, 0). According to the nine symbol points in the coordinate diagram, the nine possible series become: {1, -1, -1, 1}, {2, 0, -2, 0}, {1, 1, -1, - 1}, {0, 2, 0, -2}, {-1, 1, 1, -1}, {-2, 0, 2, 0}, {-1, -1, 1, 1}, { 0, -2, 0, 2}, {0, 0, 0, 0}.

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Abstract

A resonant power converter (220) for ultra-efficient radio frequency transmission and associated methods is disclosed. In one exemplary embodiment, the invention is digitally actuated and uses a combination of a noise-shaped encoder (222), a charging switch (224), and a high-Q resonator (204) coupled to an output load (206), typically an antenna or transmission line. Energy is built up in the electric and magnetic fields of the resonator, which, in turn, delivers power to the load (206) with very little wasted energy in the process. No active power amplifier is required. The apparatus (220) can be used in literally any RF signal application (wireless or otherwise), including for example cellular handsets, local- or wide-area network transmitters, or even radio base-stations.

Description

technical field [0001] The present invention relates to radio frequency signals, in particular to a resonant power converter for radio frequency (RF) signal transmission, reception and / or modulated radio frequency transmission and a method thereof. Background technique [0002] We know that the so-called "PAE" (Power Added Efficiency) of an amplifier is simply the output power delivered to the load divided by the DC input power required to produce this amplification. In general, for a typical CDMA (Code Division Multiple Access) handset, the power added efficiency at maximum transmit power is 33%, which is 10% lower than the average. So, if a PA with 33% power-added efficiency were to deliver 1 watt of RF power, it would require 3 watts of DC power, dissipating 2 watts as heat in the process. This is clearly a sub-optimal use of the power supply. [0003] The method used by a typical prior art radio frequency transmission system includes one or more of the following steps ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/04H04L27/00H03C1/36H03C1/46H04B1/04H04L27/36
CPCH03C1/36H03C1/46H04B1/04H04L27/04
Inventor S·R·诺兹沃斯R·W·诺兹沃斯
Owner STMICROELECTRONICS SRL
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